阅读说明：本技术 一种可更换式引射装置 (Replaceable injection device ) 是由 牛骏 柯文奇 李华 苏建政 王海波 张汝生 许晶禹 柴国兴 于 2020-05-14 设计创作，主要内容包括：本发明公开了一种可更换式引射装置,包括：构造有第一入口通道部、汇合部、第二入口通道部和出口通道部的外壳,第一/第二入口通道部与第一/第二类气井连通,汇合部分别与各入口通道部的下游和出口通道部的上游连通,出口通道部的下游与外部输送管道连通；喷嘴,其与第一入口通道部可拆卸式连接；混合及扩张室,其与出口通道部可拆卸式连接；结构参数选择模块,其用于获取各入口通道部的入口外部、出口通道部的出口外部的实时压力,根据实时压力从装置几何参数表中选取相适应的喷嘴、混合及扩张室结构数据,以安装满足结构条件的相应部件。本发明显著提高装置适用工况范围,降低装备维护、安装成本。(The invention discloses a replaceable injection device, which comprises: a housing configured with a first inlet channel portion, a junction portion, a second inlet channel portion and an outlet channel portion, the first/second inlet channel portion communicating with the first/second type gas well, the junction portion communicating with a downstream of each inlet channel portion and an upstream of the outlet channel portion, respectively, the downstream of the outlet channel portion communicating with an external delivery conduit; a nozzle detachably connected to the first inlet passage portion; a mixing and expanding chamber detachably connected to the outlet passage portion; and the structure parameter selection module is used for acquiring real-time pressure outside the inlet of each inlet channel part and outside the outlet of each outlet channel part, and selecting corresponding nozzle, mixing and expansion chamber structure data from the device geometric parameter table according to the real-time pressure so as to install corresponding parts meeting the structure conditions. The invention obviously improves the working condition range of the device and reduces the maintenance and installation cost of the equipment.)

1. A replaceable ejector device comprising:

a housing configured to include a first inlet passage portion communicating with a first type of gas well conduit, a junction portion communicating with a second type of gas well conduit, a second inlet passage portion communicating with a second type of gas well conduit, the junction portion communicating with a downstream of each inlet passage portion and an upstream of the outlet passage portion, respectively, a downstream of the outlet passage portion communicating with an external conveying conduit;

a nozzle detachably connected to an inlet end of the first inlet passage portion;

a mixing and expanding chamber detachably connected to an outlet end of the outlet passage portion;

and the structure parameter selection module is used for acquiring real-time pressure outside an inlet of the inlet channel part and outside an outlet of the outlet channel part, and selecting corresponding nozzle structure data and mixing and expanding chamber structure data from a preset device geometric parameter table according to the real-time pressure so as to install corresponding parts meeting structure conditions.

2. The apparatus of claim 1,

the first inlet channel part comprises a first connector and a first straight pipe section, and the first connector is fixedly connected with the outer side of the inlet end of the first straight pipe section;

the nozzle comprises a second connector, a second straight pipe section and a nozzle reducing section, the second connector is fixedly connected with the outer side of the inlet end of the second straight pipe section, the first connector is connected with the second connector through a flange piece, and the inner diameter of the first straight pipe section is matched with the outer diameter of the second straight pipe section.

3. The device according to claim 1 or 2,

the outlet channel part comprises a third connector and a third straight pipe section, and the third connector is fixedly connected with the outer side of the outlet end of the third straight pipe section;

the mixing and expanding chamber comprises a fourth connector and a fourth straight pipe section, the fourth connector is fixedly connected with the outer side of the outlet end of the fourth straight pipe section, the third connector is connected with the fourth connector through a flange piece, and the inner diameter of the third straight pipe section is matched with the outer diameter of the fourth straight pipe section.

4. The apparatus of claim 3,

the internal passage of the fourth straight pipe section is of a first diameter-changing structure comprising a mixing chamber section, a mixing chamber throat section and an expansion chamber section, wherein the mixing chamber section is of a gradually-reducing structure, the expansion chamber section is of a gradually-expanding structure, the caliber of the inlet end of the mixing chamber section is the same as that of the outlet end of the expansion chamber section, and the caliber of the inlet end of the mixing chamber section is larger than that of the mixing chamber throat section;

the second inlet channel part comprises a fifth connector and a fifth straight pipe section, and the fifth connector is fixedly connected with the outer side of the inlet end of the fifth straight pipe section;

the outlet end of the nozzle extends to the interior of the confluence part;

the inlet end of the mixing and expansion chamber extends to an inlet proximate the outlet channel portion.

5. The apparatus of any one of claims 1-4, further comprising an apparatus structural design module, wherein the apparatus structural design module comprises:

the working condition parameter generating unit is used for acquiring the variation range information of the initial environment parameters of the outlet end of the first type of gas well, the outlet end of the second type of gas well and the inlet end of the conveying pipeline, which are consistent with the implementation environment of the current injection technology, and generating the initial environment parameters under different working conditions by using a preset first working condition step length;

and the combined structure generating unit is used for simulating the process that the first type of gas is subjected to accelerated treatment by the nozzle and carries the second type of gas to be mixed and pass through the internal passage of the mixing and expanding chamber according to the initial environment parameters under different working conditions, so as to obtain combined structure data including nozzle geometric structure data and mixing and expanding chamber geometric structure data under each working condition, and the combined structure data is formed into the device geometric parameter table.

6. The apparatus of claim 5, wherein the apparatus structural design module further comprises:

a combined structure optimizing unit for classifying the plurality of groups of combined structure data to form the device geometry parameter table according to the classified groups of combined structure data.

7. The apparatus of claim 6, wherein the apparatus structural design module further comprises:

and the combined structure checking unit is used for simulating the combined structure data generated by each working condition through three-dimensional numerical simulation software according to the variation range information of the initial environment parameters after classification processing to obtain a device effective working boundary corresponding to each combined structure data, then integrating the parameters of the same type and the corresponding data ranges in all the device effective working boundaries, detecting whether the integration result can cover the variation range of the export environment parameters in the variation range information of the initial environment parameters, and if so, checking the output of.

8. The apparatus of claim 7,

the combined structure checking unit is also used for encrypting or sparsely adjusting the number of the classification processing results when the combined structure does not pass the checking.

9. The apparatus according to any one of claims 5 to 8, wherein the composite structure generating unit generates a set of the composite structure data according to the following steps:

acquiring the initial environmental parameters appointed under the current working condition, and calculating initial nozzle structure data by using a preset nozzle structure pneumatic model in combination with a nozzle outlet pressure given value on the basis of the initial environmental parameters;

secondly, according to the initial nozzle structure data, sequentially calculating a contraction ratio of a mixing chamber, an outlet aperture of the mixing chamber and a diffusion ratio of an expansion chamber by using a preset isobaric mixing chamber pneumatic model and a preset diffusion chamber pneumatic model, and further obtaining initial mixing and expansion chamber structure data including static pressure at an outlet of the expansion chamber;

step three, judging whether the static pressure at the outlet of the expansion chamber is smaller than the pressure at the inlet of the conveying pipeline in the current specified initial environment parameter, if not, returning to the step one, reducing the given value of the pressure at the outlet of the nozzle according to a preset pressure reduction step length to calculate new structural data of the nozzle and structural data of the mixing and expansion chamber, and if so, entering the next step;

and step four, taking the former group of nozzle structure data meeting the condition and the mixing and expanding chamber structure data as an initial data group of the combined structure data under the current working condition.

10. The apparatus according to claim 9, wherein in the process of generating a set of the composite structure data, further comprising:

acquiring a plurality of groups of length-diameter ratio data of the mixing chamber, establishing corresponding three-dimensional models of the injection devices by adopting three-dimensional numerical simulation software in combination with the initial data group based on the length-diameter ratio data, and respectively obtaining device flow field cloud pictures including a flow field speed cloud picture, a pressure cloud picture and a temperature cloud picture;

and selecting the device flow field cloud picture with the shortest mixing chamber length from the device flow field cloud pictures with the characteristic of uniform velocity field distribution of the outlet section of the mixing chamber, and writing the mixing chamber length-diameter ratio corresponding to the cloud picture into the current initial data group, thereby generating the combined structure data under the current specified working condition.

Technical Field

The invention relates to the technical field of energy collection, in particular to a replaceable injection device.

Background

The natural gas injection technology can reduce the wellhead pressure of a low-pressure gas well, improve the yield of the gas well and improve the conveying pressure of low-pressure natural gas by utilizing the energy of high-pressure natural gas, so that the requirement of gathering and transportation is met. The natural gas injection device mainly comprises a high-pressure gas inlet, a low-pressure gas inlet, a nozzle, a mixing chamber, a diffusion chamber (also called a pressure expansion chamber) and the like. The ejector does not need extra power, and is simple in structure, low in manufacturing cost, easy to install and convenient to operate. In recent years, the ejector is widely applied to a plurality of engineering and scientific research equipment at home and abroad.

The existing natural gas field production process often has the following problems: 1. in the gas field exploitation process, the stratum energy continuously decreases, the gas well pressure decreases, and pressurized exploitation is needed after the gas well pressure decreases to a certain degree, so that the pressure of a gas production engineering system is increased day by day; 2. in the same gas field, high-pressure wells and low-pressure wells exist simultaneously, especially, pressure difference among wells in cluster well production is obvious, the wells with over-high pressure need throttling, the wells with over-low pressure need pressurization, and mixed transportation of the high-pressure and low-pressure gas wells further aggravates exploitation difficulty and cost of the low-pressure wells. Therefore, optimizing the gas production process, realizing stable yield of the gas field and filling the gap of the yield are urgent problems.

The injection technology is a technology for exploiting a low-pressure well by utilizing the energy of a high-pressure gas well, can delay the supercharging exploitation time, obviously reduce the production cost, and can effectively solve the problems of low-pressure production of the gas well and mixed transportation of gas produced by the high-pressure gas well and the low-pressure gas well, but the traditional injection device is fixed in structural size and limited in applicable working condition range. When the ejector is designed, the ejector is generally designed according to specific production conditions and pressure parameters, the range of the design working condition is narrow, one ejector size is only suitable for limited production working conditions, and the ejector cannot be widely applied to different natural gas wells. In addition, along with the production, the working condition of the same natural gas well often changes rapidly, so that the injection device designed according to the originally designed working condition is not applicable any more rapidly. Under the application environment, if the working condition is slightly changed, a new injection device with other structural parameters needs to be redesigned and processed, so that the cost of design, processing, use and the like is increased, and meanwhile, the continuity of the production process is also influenced.

Disclosure of Invention

In order to solve the above technical problem, the present invention provides a replaceable injection device, including: a housing configured to include a first inlet passage portion communicating with a first type of gas well conduit, a junction portion communicating with a second type of gas well conduit, a second inlet passage portion communicating with a second type of gas well conduit, the junction portion communicating with a downstream of each inlet passage portion and an upstream of the outlet passage portion, respectively, a downstream of the outlet passage portion communicating with an external conveying conduit; a nozzle detachably connected to an inlet end of the first inlet passage portion; a mixing and expanding chamber detachably connected to an outlet end of the outlet passage portion; and the structure parameter selection module is used for acquiring real-time pressure outside an inlet of the inlet channel part and outside an outlet of the outlet channel part, and selecting corresponding nozzle structure data and mixing and expanding chamber structure data from a preset device geometric parameter table according to the real-time pressure so as to install corresponding parts meeting structure conditions.

Preferably, the first inlet passage part comprises a first connector and a first straight pipe section, and the first connector is fixedly connected with the outer side of the inlet end of the first straight pipe section; the nozzle comprises a second connector, a second straight pipe section and a nozzle reducing section, the second connector is fixedly connected with the outer side of the inlet end of the second straight pipe section, the first connector is connected with the second connector through a flange piece, and the inner diameter of the first straight pipe section is matched with the outer diameter of the second straight pipe section.

Preferably, the outlet channel part comprises a third connector and a third straight pipe section, and the third connector is fixedly connected with the outer side of the outlet end of the third straight pipe section; the mixing and expanding chamber comprises a fourth connector and a fourth straight pipe section, the fourth connector is fixedly connected with the outer side of the outlet end of the fourth straight pipe section, the third connector is connected with the fourth connector through a flange piece, and the inner diameter of the third straight pipe section is matched with the outer diameter of the fourth straight pipe section.

Preferably, the internal passage of the fourth straight pipe section is configured as a first diameter-changing structure comprising a mixing chamber section, a mixing chamber throat section and an expansion chamber section, wherein the mixing chamber section adopts a tapered structure, the expansion chamber section adopts a gradually-enlarged structure, the caliber of the inlet end of the mixing chamber section is the same as that of the outlet end of the expansion chamber section, and the caliber of the inlet end of the mixing chamber section is larger than that of the mixing chamber throat section; the second inlet channel part comprises a fifth connector and a fifth straight pipe section, and the fifth connector is fixedly connected with the outer side of the inlet end of the fifth straight pipe section; the outlet end of the nozzle extends to the interior of the confluence part; the inlet end of the mixing and expansion chamber extends to an inlet proximate the outlet channel portion.

Preferably, the device further comprises a device structural design module, wherein the device structural design module comprises: the working condition parameter generating unit is used for acquiring the variation range information of the initial environment parameters of the outlet end of the first type of gas well, the outlet end of the second type of gas well and the inlet end of the conveying pipeline, which are consistent with the implementation environment of the current injection technology, and generating the initial environment parameters under different working conditions by using a preset first working condition step length; and the combined structure generating unit is used for simulating the process that the first type of gas is subjected to accelerated treatment by the nozzle and carries the second type of gas to be mixed and pass through the internal passage of the mixing and expanding chamber according to the initial environment parameters under different working conditions, so as to obtain combined structure data including nozzle geometric structure data and mixing and expanding chamber geometric structure data under each working condition, and the combined structure data is formed into the device geometric parameter table.

Preferably, the device structural design module further comprises: a combined structure optimizing unit for classifying the plurality of groups of combined structure data to form the device geometry parameter table according to the classified groups of combined structure data.

Preferably, the device structural design module further comprises: and the combined structure checking unit is used for simulating the combined structure data generated by each working condition through three-dimensional numerical simulation software according to the variation range information of the initial environment parameters after classification processing to obtain a device effective working boundary corresponding to each combined structure data, then integrating the parameters of the same type and the corresponding data ranges in all the device effective working boundaries, detecting whether the integration result can cover the variation range of the export environment parameters in the variation range information of the initial environment parameters, and if so, checking the output of.

Preferably, the combined structure check unit is further configured to perform encryption or sparse adjustment on the number of classification processing results when the check is not passed.

Preferably, the combined structure generating unit generates a set of the combined structure data according to the following steps: acquiring the initial environmental parameters appointed under the current working condition, and calculating initial nozzle structure data by using a preset nozzle structure pneumatic model in combination with a nozzle outlet pressure given value on the basis of the initial environmental parameters; secondly, according to the initial nozzle structure data, sequentially calculating a contraction ratio of a mixing chamber, an outlet aperture of the mixing chamber and a diffusion ratio of an expansion chamber by using a preset isobaric mixing chamber pneumatic model and a preset diffusion chamber pneumatic model, and further obtaining initial mixing and expansion chamber structure data including static pressure at an outlet of the expansion chamber; step three, judging whether the static pressure at the outlet of the expansion chamber is smaller than the pressure at the inlet of the conveying pipeline in the current specified initial environment parameter, if not, returning to the step one, reducing the given value of the pressure at the outlet of the nozzle according to a preset pressure reduction step length to calculate new structural data of the nozzle and structural data of the mixing and expansion chamber, and if so, entering the next step; and step four, taking the former group of nozzle structure data meeting the condition and the mixing and expanding chamber structure data as an initial data group of the combined structure data under the current working condition.

Preferably, in the process of generating a set of the composite structure data, the method further includes: acquiring a plurality of groups of length-diameter ratio data of the mixing chamber, establishing corresponding three-dimensional models of the injection devices by adopting three-dimensional numerical simulation software in combination with the initial data group based on the length-diameter ratio data, and respectively obtaining device flow field cloud pictures including a flow field speed cloud picture, a pressure cloud picture and a temperature cloud picture; and selecting the device flow field cloud picture with the shortest mixing chamber length from the device flow field cloud pictures with the characteristic of uniform velocity field distribution of the outlet section of the mixing chamber, and writing the mixing chamber length-diameter ratio corresponding to the cloud picture into the current initial data group, thereby generating the combined structure data under the current specified working condition.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

the invention provides a replaceable injection device. The device is characterized in that the nozzle component, the mixing and diffusion chamber component and the shell are constructed in a detachable mode; analyzing and classifying the specification parameters of different injection devices to construct a device geometric parameter table which can adapt to the injection technology implementation environment; the corresponding nozzle component structure data and mixing and expanding chamber structure data under different working conditions recorded in the table form a solid component series of a plurality of sets of nozzles, mixing and expanding chambers, and a uniform specification ejector device applicable to wider operating conditions is established. The invention can overcome the problems of medium and low pressure gas well pressurized exploitation, high and low pressure well mixed transportation and narrow application range of the traditional ejector in the production of natural gas fields, can obviously expand the application working condition range of the ejector, enables the design and processing of the ejector of the target gas field gas well to be batched and generalized, and reduces the design, processing and production cost. In addition, due to the adoption of the ejector device with the replaceable nozzle and the mixing and expanding chamber, the working condition range of the ejector device is expanded, the service cycle of the device can be prolonged, and the maintenance, installation and other costs of equipment are further reduced.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic overall structure diagram of a replaceable injection device according to an embodiment of the present application.

Fig. 2 is a schematic structural diagram of a housing 100 in the replaceable injection device according to an embodiment of the present disclosure.

Fig. 3 is a schematic structural diagram of a reducing nozzle 200 in the replaceable ejector according to an embodiment of the present disclosure.

Fig. 4 is a schematic structural view of a luer nozzle 200 of the replaceable ejector according to the embodiment of the present disclosure.

Fig. 5 is a schematic view of a mixing and expansion chamber 300 of the replaceable ejector according to an embodiment of the present disclosure.

Fig. 6 is a flowchart of an apparatus structure design module 500 in the replaceable ejector according to an embodiment of the present disclosure.

Fig. 7 is a schematic flow chart of the combined structure generating unit 520 in the replaceable injection device according to the embodiment of the present application.

Detailed Description

The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.

Additionally, the steps illustrated in the flow charts of the figures may be performed in a computer system such as a set of computer-executable instructions and, although a logical order is illustrated in the flow charts, in some cases, the steps illustrated or described may be performed in an order different than here.

The natural gas injection technology can reduce the wellhead pressure of a low-pressure gas well, improve the yield of the gas well and improve the conveying pressure of low-pressure natural gas by utilizing the energy of high-pressure natural gas, so that the requirement of gathering and transportation is met. The natural gas injection device mainly comprises a high-pressure gas inlet, a low-pressure gas inlet, a nozzle, a mixing chamber, a diffusion chamber (also called a pressure expansion chamber) and the like. The ejector does not need extra power, and is simple in structure, low in manufacturing cost, easy to install and convenient to operate. In recent years, the ejector is widely applied to a plurality of engineering and scientific research equipment at home and abroad.

The existing natural gas field production process often has the following problems: 1. in the gas field exploitation process, the stratum energy continuously decreases, the gas well pressure decreases, and pressurized exploitation is needed after the gas well pressure decreases to a certain degree, so that the pressure of a gas production engineering system is increased day by day; 2. in the same gas field, high-pressure wells and low-pressure wells exist simultaneously, especially, pressure difference among wells in cluster well production is obvious, the wells with over-high pressure need throttling, the wells with over-low pressure need pressurization, and mixed transportation of the high-pressure and low-pressure gas wells further aggravates exploitation difficulty and cost of the low-pressure wells. Therefore, optimizing the gas production process, realizing stable yield of the gas field and filling the gap of the yield are urgent problems.

The injection technology is a technology for exploiting a low-pressure well by utilizing the energy of a high-pressure gas well, can delay the supercharging exploitation time, obviously reduce the production cost, and can effectively solve the problems of low-pressure production of the gas well and mixed transportation of gas produced by the high-pressure gas well and the low-pressure gas well, but the traditional injection device is fixed in structural size and limited in applicable working condition range. When the ejector is designed, the ejector is generally designed according to specific production conditions and pressure parameters, the range of the design working condition is narrow, one ejector size is only suitable for limited production working conditions, and the ejector cannot be widely applied to different natural gas wells. In addition, along with the production, the working condition of the same natural gas well often changes rapidly, so that the injection device designed according to the originally designed working condition is not applicable any more rapidly. Under the application environment, if the working condition is slightly changed, a new injection device with other structural parameters needs to be redesigned and processed, so that the cost of design, processing, use and the like is increased, and meanwhile, the continuity of the production process is also influenced.

In order to solve the technical problem, the invention provides an injection device with replaceable nozzles, a mixing chamber and a diffusion chamber. The invention is pre-constructed with a device geometric parameter table which is constructed based on the external environment change range of the injection device in the current injection technology implementation scene, and the table records the internal structure parameters of the nozzle and the structure parameters of the mixing and expanding chamber which need to be used under different working conditions within the change range. The shell is of an integrated molding structure and comprises a first inlet channel part communicated with a high-pressure gas well, a second inlet channel part communicated with a low-pressure gas well, a merging part used for merging injection gas and injected gas, and an outlet channel part respectively communicated with the outlet end of the merging part and an external conveying pipeline; the nozzle is detachably connected with the inlet end of the first inlet channel part; the mixing and expanding chamber is detachably connected with the outlet end of the outlet channel part. During the implementation of the injection technology, real-time pressure data outside the inlet end of the first inlet channel part, the inlet end of the second inlet channel part and the outlet end of the outlet channel part are detected and obtained in real time by the structure parameter selection module, structure data of corresponding nozzle parts and mixing and expanding chamber parts are selected from the device geometric parameter table according to the real-time pressure data, and the nozzle and the mixing and expanding chamber which meet the current structure conditions are respectively installed at the specified positions of the shell.

The ejector device provided by the invention overcomes the problem of narrow application condition range in the production of a natural gas field and the application of a traditional ejector, can remarkably expand the application condition range of the ejector device by establishing and forming a geometric parameter table of the ejector device with uniform specification suitable for wider operation conditions, simplifies the design process of the target gas field gas well ejector device, can achieve the purposes of batch processing and generalization, and reduces the design processing and production cost. In addition, the ejector device with the replaceable nozzle, the replaceable mixing chamber and the replaceable pressure expansion chamber has the advantages that due to the fact that the application working condition range is enlarged, the usable period is prolonged, and the costs of maintenance, installation and the like of equipment can be further reduced.

Fig. 1 is a schematic overall structure diagram of a replaceable injection device according to an embodiment of the present application. As shown in fig. 1, the injection device of the present invention at least includes: a housing 100, a nozzle 200, a mixing and expansion chamber 300, and a structural parameter selection module 400. Referring to fig. 2, the casing 100 is configured to include a first inlet passage portion 110, a merging portion 120, a second inlet passage portion 130, and an outlet passage portion 140. The first inlet passage portion 110 is communicated with a first-class gas well pipeline in a current injection technology implementation scene (the first-class gas well is preferably a high-pressure gas well in a current injection technology implementation environment, and the first-class gas well pipeline refers to a high-pressure gas output pipeline of the current high-pressure gas well). The second inlet channel portion 130 is communicated with a second-type gas well pipeline in the current injection technology implementation scenario (the second-type gas well is preferably a low-pressure gas well in the current injection technology implementation environment, and the second-type gas well pipeline refers to a low-pressure gas output pipeline of the current low-pressure gas well). The junction 120 is connected to a downstream port of the first inlet passage 110, a downstream port of the second inlet passage 130, and an upstream port of the outlet passage 140, and mixes the high-pressure gas (purge gas) flowing out from the nozzle 200 in the first inlet passage 110 and the low-pressure gas (purge gas) supplied from the second inlet passage 130 and supplies the mixture to the mixing and expanding chamber 300 in the outlet passage 140. The downstream port of the outlet passage portion 140 communicates with an external delivery conduit within the current injection technology implementation scenario. Preferably, the first inlet passage portion 110, the merging portion 120, the second inlet passage portion 130, and the outlet passage portion 140 are integrally molded to form the respective housings 100.

Further, the nozzle 200 is inserted from the inlet end of the first inlet channel part 110, and the nozzle 200 is configured to be detachably coupled to the inlet end of the first inlet channel part 110. Still further, the outlet of the nozzle 200 extends to the interior of the junction 120. The nozzle 200 is used to accelerate the incoming high pressure injection gas.

Further, the mixing and expanding chamber 300 is inserted from the outlet end of the outlet channel part 140, and the mixing and expanding chamber 300 and the outlet end of the outlet channel part 140 are configured to be detachably coupled. More specifically, the inlet of the mixing and expanding chamber 300 extends to the inlet end near the outlet passage portion 140. The mixing and expanding chamber 300 is used to isobarically mix the high-pressure gas discharged from the nozzle 200 with the introduced low-pressure gas, stabilize the pressure of the isobarically mixed gas, and transmit the gas to an external transmission line. Therefore, the mixed gas is conveyed to the low-pressure natural gas reservoir with lower efficiency, so that the conveying pressure is improved, the low-pressure natural gas reservoir is subjected to pressurized exploitation, and the pressure low-pressure well is subjected to pressurized transformation on the basis of throttling regulation of the high-pressure well.

In order to solve the problem that the range of the applicable working condition of the injection device is narrow in the prior art, a table (device geometric parameter table) for internal structural parameters of the injection device applicable under different working conditions in the variation range is constructed in advance according to the variation range of the external environment of the injection device in the current injection technology implementation scene, and corresponding internal structural parameters of a nozzle and structural parameters of a mixing and expanding chamber are corresponding to each specific working condition. Therefore, according to the data in the geometric parameter table of the device, nozzle parts with different structures and mixing and expanding chamber parts with different structures are processed and produced, and in the field implementation process of the subsequent injection technology, the corresponding nozzle parts and mixing and expanding chamber parts can be selected according to the real-time external environment data detected on the field and are respectively arranged at the corresponding positions of the shell, so that the injection device can adapt to various types of working condition ranges under the current environment.

Further, the structural parameter selection module 400 is configured to detect and obtain a real-time pressure outside the inlet (outside the inlet) and adjacent to the inlet of the first inlet passage portion 110, a real-time pressure outside the inlet (outside the inlet) and adjacent to the inlet of the second inlet passage portion 130, and a real-time pressure outside the outlet and adjacent to the outlet of the outlet passage portion 140, and select suitable nozzle structural data and mixing and expanding chamber structural data from a preset device geometric parameter table according to the real-time pressure data (the real-time pressure data is the external environment data), so as to install the nozzle component 200 and the mixing and expanding chamber component 300 meeting the structural conditions.

Further, in a preferred embodiment, the nozzle configuration data includes, but is not limited to: nozzle type, nozzle outlet pressure, nozzle size information, nozzle outlet mach number, etc. Wherein, when the nozzle type is a reduced nozzle, the nozzle size information includes but is not limited to: the outlet aperture of the nozzle, etc.; when the nozzle type is a ralel (zoom) nozzle, the nozzle size information includes, but is not limited to: the outlet aperture of the nozzle, the diameter of the nozzle throat, etc. The above mixing and expansion chamber configuration data include, but are not limited to: the outlet caliber of the mixing chamber, the length-diameter ratio of the mixing chamber, the expansion ratio of the expansion chamber, the (optimal) static pressure of the outlet of the expansion chamber and the like.

Fig. 2 is a schematic structural diagram of a housing 100 in the replaceable injection device according to an embodiment of the present disclosure. As shown in fig. 2, the first inlet passage portion 110 includes a first connector 111 and a first straight pipe section 112. The first connector 111 is fixedly connected to the outside (periphery) of the inlet end of the first straight pipe section 112. The first straight tube section 112 has a first straight tube passage 113 therein for receiving the nozzle 200. The second inlet passage portion 130 includes a fifth connector 131 and a fifth straight tube section 132. The fifth connector 131 is fixedly connected to the inlet end outer side (periphery) of the fifth straight pipe section 132. The fifth straight pipe section 132 has a fifth straight pipe passage 133 therein for conveying the second type of gas (low-pressure injected gas) conveyed from the second type of gas well pipeline. Preferably, the fifth connector 131 is a flange member. When the gas field is installed and used, the fifth connector 131 (flange) is fixedly connected with a flange piece at the outlet of the low-pressure well gas pipeline through a bolt, so that the fifth straight pipe passage 133 is communicated with the second type gas well pipeline. The outlet channel portion 140 comprises a third connector 141 and a third straight tube section 142. The third connector 141 is fixedly connected to the outer side (periphery) of the outlet end of the third straight pipe section 142. The third straight tube section 142 has a third straight tube passage 143 therein for receiving the mixing and expansion chamber 300.

Fig. 3 is a schematic structural diagram of a reducing nozzle 200 in the replaceable ejector according to an embodiment of the present disclosure. Fig. 4 is a schematic structural view of a luer nozzle 200 of the replaceable ejector according to the embodiment of the present disclosure. Referring to fig. 3 and 4, the nozzle 200 includes: a second connector 201, a second straight tube section 202 and a nozzle reducer section 203. Wherein the second connector 201 is fixedly connected with the outside (periphery) of the inlet end of the second straight pipe section 202. The second straight pipe section 202 has a second straight pipe passage 204 therein for conveying a first gas (high pressure injection gas) introduced from a first gas well pipeline. The first connector 111 and the second connector 201 are connected by a flange. Further, when the gas field is installed and used, the first connector 111 (flange) and the second connector 201 (flange) are fixedly connected with a flange piece at the outlet of the high-pressure well gas pipeline through bolts, so that the second straight pipe passage 204 in the nozzle 200 is communicated with the first type of gas well pipeline. Further, the inner diameter of the first straight pipe section 112 (the diameter of the first straight pipe passage 113) is matched with the outer diameter of the second straight pipe section 202.

Further, the outer contour (longitudinal section) of the nozzle reducer section 203 adopts a tapered structure. As shown in fig. 3, the inside of the reducing nozzle has a nozzle passage 205 of a first configuration, the inlet end caliber of the nozzle passage 205 is the same as the caliber of the second straight pipe passage 204, wherein the first configuration is a conical contraction configuration. As shown in fig. 4, the interior of the flare nozzle has a nozzle passage 205 of a second configuration, the inlet end caliber of the nozzle passage 205 being the same as the caliber of the second straight tube passage 204, wherein the second configuration is configured as a tapered conical tube segment configuration 206, a circular arc transition throat segment configuration 207, and a tapered conical tube segment configuration 208.

Fig. 5 is a schematic view of a mixing and expansion chamber 300 of the replaceable ejector according to an embodiment of the present disclosure. Referring to fig. 5, the mixing and expansion chamber 300 includes: a fourth connector 301 and a fourth straight tube section 302. Wherein the fourth connector 301 is fixedly connected with the outer side of the outlet end of the fourth straight pipe section 302. The fourth straight pipe section 302 has a fourth passage with a contraction-straightening-release structure (first diameter-variable structure) inside, and is configured to sequentially perform isobaric mixing, pressure stabilization and pressurization on the injected gas and the injected gas delivered from the junction 120, and deliver the mixed gas and the injected gas into an external delivery pipe. The fourth connector 301 and the third connector 141 are connected by a flange. Further, when natural gas field installation was used, fourth connector 301 (flange), third connector 141 (flange) passed through bolt fixed connection with the flange spare of outside delivery pipe network pipeline entrance simultaneously for mix and expand above-mentioned fourth passageway and outside delivery pipe intercommunication in the room 300. Further, the inner diameter of the third straight pipe section 142 (the diameter of the third straight pipe passage 143) matches the outer diameter of the fourth straight pipe section 302.

Further, as shown in fig. 5, the fourth passage is configured as a first diameter-changing structure. Specifically, the fourth pass is configured to include a mixing chamber (section) 303, a straight tube-transition mixing chamber throat (section) 304, and a gradually expanding diffusion chamber (section) 305. The mixing chamber section 303 adopts a gradually contracting conical structure, the expansion chamber section 305 adopts a gradually expanding conical structure, the caliber of the inlet end of the mixing chamber section 303 is the same as or close to the caliber of the outlet end of the expansion chamber section 305, and the caliber of the inlet end of the mixing chamber section 303 is larger than the caliber of the throat section 304 of the mixing chamber.

In practical application, high-pressure natural gas delivered from a high-pressure gas well enters through the inlet end of the first inlet channel part 110 of the injection device, the accelerated depressurization process is completed through the nozzle 200 of the injection device, when the reducing nozzle is used, the gas is accelerated to a subsonic speed state at the outlet of the nozzle, and when the Laval nozzle is used, the gas is accelerated to a supersonic speed state at the outlet of the nozzle. Meanwhile, the low-pressure natural gas delivered from the low-pressure gas well enters through the inlet end of the second inlet passage part 130 of the injection device, flows through the fifth straight pipe section 132, enters the low-pressure area formed by the junction part 120 at the position behind the outlet of the nozzle 200 of the injection device, and under the wrapping effect of pressure difference and high-speed airflow at the outlet of the nozzle, the injection gas and the injected gas enter the mixing chamber 303 of the injection device. Then, the high-speed gas flow (injection gas) from the nozzle 200 and the low-speed gas flow (injected gas) from the low-pressure gas well are mixed isobarically in the mixing chamber 303, and the velocity distribution is approximately uniformly distributed at the outlet of the mixing chamber. The gas mixed uniformly at the exit of the mixing chamber then passes through the mixing chamber throat pipe section 304 where the flow conditions are further smoothed (if the exit of the mixing chamber 305 is supersonic, it changes to subsonic flow via shock waves in the throat), and then, after the mixed gas flow passes through the mixing chamber throat 304, it enters the diffusion chamber 305 where the velocity of the gas flow is further reduced and the pressure is gradually increased until it returns to a pressure greater than or equal to the exit pipe network pressure. At the moment, the mixed airflow flows out through the outlet of the injection device and enters the conveying pipe network.

After explaining an injection structure in the injection device according to the embodiment of the present invention, a construction process of the geometric parameter table of the device is further explained in detail. Referring to fig. 1, the injection apparatus further includes: the device structure design module 500. Fig. 6 is a flowchart of an apparatus structure design module 500 in the replaceable ejector according to an embodiment of the present disclosure. The internal structure and the work flow of the device structure design module 500 will be described with reference to fig. 1 and 6.

As shown in fig. 1, the device structural design module 500 at least includes: an operating condition parameter generating unit 510 and a composite structure generating unit 520. The operating condition parameter generating unit 510 is configured to (step S601) obtain variation range information of initial environment parameters of the outlet end of the first-type gas well, the outlet end of the second-type gas well, and the inlet end of the conveying pipeline, which are consistent with the current injection technology implementation environment, and generate initial environment parameters for different operating conditions based on the variation range information and by using a preset first operating condition step size (step S602). In the actual application process, due to the influence of factors such as the geographical position and the weather environment implemented by the injection technology, the variation range of the application environment implementing the technology has certain difference, and therefore, the working condition conditions included in the variation range are different. Therefore, when the device geometric parameter table is constructed, the information of the variation range of the initial environmental parameter (of the first inlet of the device) outside the outlet end of the gas well of the first type and adjacent to the current outlet, the information of the variation range of the initial environmental parameter (of the second inlet of the device) outside the outlet end of the gas well of the second type and adjacent to the current outlet, and the information of the variation range of the initial environmental parameter (of the second inlet of the device) outside the inlet end of the conveying pipeline and adjacent to the current inlet need to be acquired, and the information is used as a data base for constructing the device geometric parameter table.

Further, in one embodiment of the present invention, the initial environmental parameters of the first inlet of the device include, but are not limited to: inlet pressure, temperature, flow rate, and pipe diameter (caliber of the first inlet), etc. The initial environmental parameters of the second inlet of the device include, but are not limited to: inlet pressure, temperature, and pipe diameter (caliber of the second inlet), etc. The initial environmental parameters of the device outlet include, but are not limited to: the pressure outside the outlet and immediately adjacent to the current outlet, etc.

It should be noted that, in the embodiment of the present invention, although the condition parameter generating unit 510 acquires the initial environment parameters at the device outlet, in the process of generating the initial environment parameters for different conditions, the initial environment parameters only need to be generated according to the variation range information of the initial environment parameters at two device inlets. Specifically, according to the variation range information of the initial environment parameters at two entrance positions, for different types of parameters, a single control variable method is adopted, the variation range of one type of parameters is determined and a corresponding first working condition step length is set for the parameters, the type of parameters are set as variables, other types of parameters are set as quantitives, all control quantity values of the current variables and a plurality of groups of combined initial environment parameters which are set as quantitive control quantities with other types of parameters are listed; determining the variation range of another type of parameter, setting a corresponding first working condition step length for the variation range, setting the type of parameter as a variable and setting other types of parameters as a fixed quantity, and listing all control quantity values of the current variable and a plurality of groups of combined initial environment parameters under the condition that the other types of parameters are set as fixed quantity control quantity combinations; by analogy, after all types of parameters are used as variables, a plurality of groups of initial environment parameters in different combination forms are obtained, each combination corresponds to one working condition, and each working condition corresponds to an initial environment parameter with a specific numerical value.

Further, in order to simplify the types and the number of the different working conditions, parameters which have a large influence on the injection technology can be selected as variables to be controlled to generate a plurality of groups of initial environment parameters in different combination forms. For example: at only the pressure, temperature and flow at the high pressure gas well outlet (first inlet); and generating a combination of different operating conditions as a function of pressure and temperature at the outlet (second inlet) of the low-pressure gas well.

Further, the combined structure generating unit 520 is configured to (step S603) accelerate the first type of gas through the nozzle 200 and carry the second type of gas according to the initial environment parameters (the initial environment parameters corresponding to each operating condition and having specific values) under different operating conditions, and simulate a process (combining an aerodynamic principle, a fluid mechanics principle, and the like) of mixing the first type of gas and the second type of gas through the internal passage of the mixing and expanding chamber 300, so as to obtain combined structure data (of the device) under each operating condition, and form a device geometric parameter table. Wherein each kind of (device) composite structure data comprises: nozzle configuration data, and mixing and expansion chamber configuration data.

Further, although the injection device with a wider applicable working condition range can be designed for the current injection technology implementation environment, factors such as the change range of the technology application environment, the change frequency of the application environment, the economic cost when the nozzle is replaced, the mixing chamber is mixed and expanded, the influence on the injection technology implementation process when the components are frequently replaced, the influence on other related equipment when the components are frequently replaced, and the like are considered, so that the working condition number of the geometric parameter table of the injection device needs to be further reduced, and the table is simplified.

In a preferred embodiment of the present invention, with continued reference to fig. 1, the device structure design module 500 further includes: a composite structure optimization unit 530. The composite structure optimizing unit 530 is configured to (step S604) classify the plurality of sets of composite structure data generated by the composite structure generating unit 520 to form a new device geometry parameter table subjected to the classification optimizing process according to the classified plurality of sets of composite structure data. Specifically, for combined structure data obtained by calculation under different working conditions (each working condition corresponds to an initial environment parameter with a specific designated value), device combined structures with similar nozzle structure sizes and similar mixing and expansion chamber structure sizes are classified by selecting one size parameter in a similar size range, and meanwhile, the initial environment parameters with the specific values corresponding to the similar sizes are classified to generate corresponding sub-ranges, so that a series of device combined structure data with different nozzle structure parameters and mixing and diffusion chamber structure parameters are formed, and each group of device combined structure data corresponds to the corresponding initial environment parameter sub-ranges. The classification principle is as follows: selecting a nozzle outlet with a low pressure for the structural size of the nozzle component; the throat size (mixing chamber exit orifice size) is selected to be in an intermediate position with respect to the structural dimensions of the mixing and diffusion chamber components.

Further, in the practical application process, since the above-mentioned combination structure optimization unit 530 only considers the similarity of the device combination structure data when performing the classification process, the feasibility of such device combination data is not actually considered. Therefore, in order to improve the accuracy of the above device geometry table, the feasibility test of the device geometry table generated by the combined structure optimization unit 530 needs to be further performed. In a preferred embodiment of the present invention, with continued reference to fig. 1, the device structure design module 500 further includes: the composite structure check unit 540. The combined structure checking unit 540 is configured to (step S605) respectively simulate, according to the variation range information of the initial environmental parameters after the classification processing, combined structure data generated by each working condition through three-dimensional numerical simulation software (e.g., Fluent software) to obtain a device effective working boundary corresponding to each combined structure data, then (step S606) integrate the same type of parameters and corresponding data ranges within all the device effective working boundaries, and (step S607) detect whether the current integration result can cover the device outlet environmental parameter variation range within the variation range information of the initial environmental parameters.

Further, since the variation range information of the initial environment parameter is the variation range information of the classified initial environment parameter obtained at the combination structure optimization unit 530, that is, the multiple sets of initial environment parameter sub-ranges, the device combination structure data corresponding to each set of initial environment parameter sub-ranges needs to be simulated to determine the device effective working boundary of each set of device combination structure data. Wherein the effective working boundary of the device is preferably the range interval of the static outlet pressure of the expansion chamber 305. It should be noted that, when simulating the device combination structure data corresponding to a certain set of initial environment parameter sub-ranges, initial environment parameters with specific values corresponding to different working conditions under the current sub-range are generated first (the process is similar to the process in which the working condition parameter generating unit 510 generates the initial environment parameters with specific values under different working conditions by using the first working condition step length, and details are not described here); then, respectively simulating the injection process of each working condition under the limitation of the current device combined structure data through three-dimensional numerical simulation software, and obtaining corresponding expansion chamber outlet static pressure aiming at each working condition; finally, all expansion chamber exit static pressures within the current sub-range are integrated into a corresponding range interval, thereby forming a device effective working boundary (range) for the current device composite structure data.

Further, after obtaining the device effective working boundaries corresponding to all the device combination structure data, the device effective working boundaries are integrated to obtain the effective working boundary range of the whole (uniform specification) injection device. Finally, the effective working boundary range of the whole (unified specification) injection device is compared with the variation range information of the initial environmental parameters of the inlet end (device outlet end) of the conveying pipeline, which is acquired by the working condition parameter generating unit 510. If the effective working boundary range of the whole (unified specification) injection device can cover the initial environmental parameter variation range of the outlet end of the current device, the geometric parameter table of the device generated by the current combination structure optimization unit 530 is verified, and the geometric parameter table can be directly applied to an injection technology implementation field.

In addition, the above-mentioned combined structure check unit 540 is also configured to perform encryption or sparse adjustment on the number of classification processing results when the check is not passed. Specifically, if the effective working boundary range of the whole (unified specification) ejector device cannot completely cover the initial environmental parameter variation range of the outlet end of the current device (for example, the conditions that the range is out of range, or a part of the middle range is not covered, or the overlapping parts of the effective working boundary ranges of the devices belonging to different groups are too much and the like occur), the device geometric parameter table generated by the current combination structure optimization unit 530 does not pass the verification, cannot be directly applied to the ejection technology implementation field, and returns to the combination structure optimization unit 530 to perform encryption or sparse adjustment on the classification processing.

For example, if the effective working boundary ranges of all the single devices together cannot cover and the effective working boundary range of the whole (unified specification) injection device exists, that is, the uncovered areas exist between the working boundary ranges of different groups, the effective working boundary ranges need to be returned to the combined structure optimization unit 530 to adjust the structure classification and division scheme, which is generally encryption adjustment; if the overlapped parts of the working boundaries of different groups are too large, the working boundaries are returned to the combined structure optimization unit 530, the structure classification and division scheme is adjusted, the number of combinations in the table is reduced, and sparse processing is performed. Thus, the number of parts can be reduced, the cost required for replacing the parts can be reduced, and the number of working conditions in the table can be more reasonable.

Further, in the combined structure generating unit 520, the device combined structure data under the current working condition needs to be calculated according to the initial environment parameters of the specific values corresponding to each working condition, so as to provide a set of structure data for subsequently forming the device geometric parameter table. Since the calculation process of the device combination structure data corresponding to each operating condition is the same, the calculation process of one set of device combination structure data in the embodiment of the present invention is described.

Fig. 7 is a schematic flow chart of the combined structure generating unit 520 in the replaceable injection device according to the embodiment of the present application. As shown in fig. 7, step S701 obtains specified initial environmental parameters under the current working condition, and calculates nozzle structure data according to the specified initial environmental parameters and by using a preset nozzle structure pneumatic model in combination with a nozzle outlet pressure given value.

Further, in a preferred embodiment of the present invention, the nozzle geometry parameters are calculated by a one-dimensional numerical algorithm. The one-dimensional numerical calculation is based on an aerodynamic theory, and the theoretical model simplification comprises the following design principles: 1. the gas is ideal gas (specific heat and specific heat ratio are constants); 2. the gas flow is one-dimensional, non-viscous, axial and adiabatic isentropic flow; 3. the injection airflow is matched with the injected airflow at the inlet of the mixing area in a static pressure manner; 4. the gas does not generate chemical reaction and is fully mixed at the outlet of the mixing zone; 5. the friction loss is ignored; 6. the outlet flow rate is lower than the speed of sound.

Further, in a preferred embodiment of the present invention, the nozzle geometry parameters are calculated as follows:

1) obtaining the initial environmental parameters of the first inlet of the device, the second inlet of the device, and the outlet of the device in the initial environmental parameters with specific values under the current working condition, including but not limited to: high pressure gas inlet pressure, temperature, flow rate and pipe diameter; inlet pressure, temperature and pipe diameter of the low pressure gas; mixed gas outlet pressure, temperature and pipe diameter.

2) Calculating the inlet basic parameters of each inlet in the current device under the condition of a given numerical value according to various initial environment parameters obtained in the step 1). Wherein the entry basic parameters include but are not limited to: actual flow velocity, gas constant, local sonic velocity, mach number, total inlet pressure, etc.

3) Calculating initial structure data of the nozzle 200 by using a nozzle structure pneumatic model according to all the initial environment parameter values of the inlets obtained in the step 1) and the inlet basic parameters of each inlet obtained in the step 2). Among these, nozzle structure data include, but are not limited to: nozzle critical pressure, nozzle type, nozzle exit pressure, nozzle exit mach number, and nozzle geometry size, among others. Further, reducing the structural dimensions of the nozzle includes, but is not limited to: nozzle outlet diameter (caliber), etc.; structural dimensions of the laval nozzle include, but are not limited to: the diameter (caliber) of the nozzle outlet, the diameter (caliber) of the nozzle throat and the like. The nozzle structure pneumatic model is expressed by the following expressions (1) to (6):

wherein p is_*Denotes the critical pressure, p, of the nozzle_niDenotes nozzle inlet pressure, M_niRepresents the nozzle inlet mach number, and gamma represents the specific heat ratio of the high-pressure gas. When the critical pressure of the nozzle is less than or equal to the nozzle inlet pressure (high-pressure gas inlet pressure) p_lWhen is, i.e. p_*≤p_lThe nozzle type is a reducing nozzle; when the critical pressure of the nozzle is greater than or equal to the nozzle inlet pressure p_lWhen is, i.e. p_*≥p_lWhen the nozzle type is a Laval nozzle.

Further, the exit mach number of the reduction nozzle is calculated using the following expression:

wherein M is_neRepresenting exit Mach number, p_neDenotes the nozzle outlet pressure, p₀Representing the total nozzle inlet pressure.

Further, the outlet diameter D of the reduction nozzle was calculated using the following expression_ne：

Wherein D is_niIndicating the nozzle inlet diameter.

Further, the throat diameter D of the Laval nozzle was calculated using the following expression_nt：

Further, the exit mach number M of the nozzle was calculated using the following expression_ne：

Further, the outlet diameter D of the flare nozzle was calculated using the following expression_ne：

After the calculation of the nozzle configuration data is completed, the flow proceeds to step S702. Step S702 sequentially calculates a contraction ratio of the mixing chamber, an outlet aperture of the mixing chamber, and a diffusion ratio of the expansion chamber, using a preset isobaric mixing chamber pneumatic model and a diffusion chamber pneumatic model, according to the nozzle structure data obtained in step S701, thereby obtaining initial mixing and expansion chamber structure data including a static pressure at an outlet of the expansion chamber.

Further, in a preferred embodiment of the present invention, the geometric parameters of the mixing and expansion chamber are calculated by a one-dimensional numerical algorithm.

Further, in a preferred embodiment of the present invention, the initial mixing and expansion chamber configuration data is calculated as follows:

1) and calculating the contraction ratio of the mixing chamber and the outlet aperture of the mixing chamber by using a preset isobaric mixing chamber pneumatic model. Firstly, based on the pressure distribution principle at the inlet of the mixing chamber, the injection and injected inlet pressures are expressed by the following expression: p is a radical of_p＝p_s＝p_ne(7) Wherein p is_pRepresenting the pressure, p, of the main flow, i.e. the ejector gas flow (high-pressure gas) at the inlet of the mixing chamber_sRepresenting the pressure of the secondary flow, i.e. the drawn gas flow (low-pressure gas), at the inlet of the mixing chamber, p_neIndicating the nozzle outlet pressure.

Based on the pneumatic function relational equation:wherein, λ represents a speed coefficient,m represents a mach number.

Further, the above formula (7) is rewritten as follows: p is a radical of_0pπ(λ_p,γ_p)＝p_0sπ(λ_s,γ_s) (10) obtainingThereby, the velocity coefficient of the secondary flow gas is calculated using expression (11). Wherein p is_0pDenotes the total pressure of the main flow, λ_pRepresenting the coefficient of principal flow velocity, gamma_pDenotes the ratio of the specific heat of the mainstream gas, p_0sDenotes the total pressure of the secondary stream, λ_sRepresenting the coefficient of sub-velocity, gamma_sIndicating the ratio of the specific heat of the secondary stream gas.

Based on the pneumatic function relational equation:

further, based on the above expressions (8) to (13), the mixing-chamber contraction ratio Φ is calculated using the following expressions in order:

wherein the shrinkage ratioA_mDenotes the cross-sectional area of the mixing chamber outlet channel, A_pDenotes the cross-sectional area of the main flow channel, A_sThe cross-sectional area and specific heat ratio of the secondary flow passageC_ppDenotes the constant pressure specific heat of the main stream gas, C_psThe constant pressure specific heat and the total temperature ratio of the secondary gas are shownT_0pIndicates the total temperature of the main stream, T_0sRepresents the total temperature of the secondary flow, k represents the injection coefficient,gas characteristic constantR represents a gas constant, R_pDenotes the mainstream gas constant, R_sDenotes the sub-stream gas constant, R_mDenotes the outlet gas constant, gamma, of the mixing chamber_mRepresenting the specific heat ratio, p, of the gas at the outlet of the mixing chamber_0mRepresenting the total pressure of the gas at the outlet of the mixing chamber, alpha representing the area ratio of the primary and secondary flow channels,

further, from the equation of conservation of momentum To obtain lambda_mWherein λ is_mExpressing the mixing chamber exit velocity coefficient, T_0mRepresenting the total temperature of the mixing chamber outlet gas.

Further, according to the isobaric mixing chamber isobaric conditions p_m＝p_p(22) To obtainWherein p is_mDenotes the mixing chamber outlet gas pressure, p_0mRepresenting the total pressure of the mixing chamber outlet gas.

Thus, the calculation of the internal structural parameters of the mixing chamber section, such as the contraction ratio of the mixing chamber and the outlet diameter of the mixing chamber (the outlet diameter of the mixing chamber is calculated from the cross-sectional area of the outlet flow passage of the mixing chamber), is completed by the isobaric mixing chamber pneumatic model (preferably, expression 7 to expression 23).

2) And calculating the diffusion ratio of the diffusion chamber by using a preset pneumatic model of the diffusion chamber.

When the mixing chamber outlet is supersonic, the expansion chamber expansion ratio is calculated by the following expression:

wherein λ is_dExpressing the diffusion chamber exit velocity coefficient, gamma_dRepresenting the specific heat ratio, σ, of the gas at the outlet of the diffusion chamber_mExpressing the total pressure recovery coefficient sigma of the gas at the outlet of the mixing chamber after the gas passes through the shock wave_dThe total pressure recovery coefficient of the subsonic section of the diffusion chamber is shown, psi represents the diffusion ratio of the diffusion chamber,A_dthe cross-sectional area of the diffuser exit flow path is shown.

Further, since in the formula (24), solving equation (25) to obtain the outlet velocity coefficient lambda of the diffusion chamber by an iterative calculation method_d。

Further, the total pressure of the outlet of the pressure expansion chamber, the static pressure of the outlet of the pressure expansion chamber and the recovery coefficient of the injection device are calculated in sequence by using the following expressions:

p_0d＝p_0mσ_mσ_d (26)

p_d＝p_0dπ(λ_d,γ_d) (27)

wherein p is_0dDenotes the total outlet pressure of the diffusion chamber, p_dThe static pressure at the outlet of the expansion chamber is shown, and H is the recovery coefficient of the injection device. Thus, when it is determined in step S701 that the laval nozzle should be currently used, initial mixing and expansion chamber configuration data is calculated by the above expressions (24) to (28).

When the mixing chamber outlet is subsonic, the expansion chamber diffusion ratio is calculated by the following expression:

wherein, in the formula (29),solving equation (29) to obtain the outlet velocity coefficient lambda of the diffusion chamber by an iterative calculation method_d。

Further, the total pressure of the outlet of the diffusion chamber, the static pressure of the outlet of the diffusion chamber and the recovery coefficient of the injection device under the current working condition are sequentially calculated by using the expressions (26) to (28). Thus, when it is determined in step S701 that the reducing nozzle should be currently used, initial mixing and expansion chamber configuration data is calculated by the following expressions (26) to (30).

Thus, the calculation of the expansion chamber expansion ratio and the expansion chamber outlet static pressure and other internal structural parameters of the expansion chamber section is completed by the above-described expansion chamber pneumatic model (preferably, expression 24 to expression 30), and the process proceeds to step S703.

In the practical application process, the condition that the mixed gas can automatically flow out of the outlet of the injection device needs to meet the condition that the static pressure of the outlet of the current expansion chamber is larger than the inlet pressure value of the conveying pipeline, but is close to the inlet pressure value of the conveying pipeline as much as possible, so that the condition that the injection device normally implements the injection technology can be met, the efficient utilization of the injection energy is guaranteed, and the injection coefficient is maximized. Therefore, under the condition of calculating the current designated initial environment value, in order to obtain a set of device combination structure data calculation results, the optimal device outlet pressure actual value, namely the expansion chamber outlet static pressure p needs to be found_d. Thus, in step S701 to S705, it is necessary to find an optimal expansion chamber outlet static pressure (device outlet pressure) that satisfies the requirement of maximizing the performance of the injection technique by gradually decreasing the given value of the nozzle outlet pressure, and detect it.

Step S703 judges the current extension chamber outlet static pressure p_dWhether the pressure of the inlet of the conveying pipeline (the working condition parameter of the pressure of the outlet of the device) p is less than the initial environmental parameter of the currently specified specific value_eAt the outlet of the expansion chamber, static pressure p_dDelivery pipe inlet pressure p greater than or equal to the currently specified specific value_eIn step S704, according to a preset pressure reduction step length, calculating a difference between the current nozzle pressure set value and the pressure reduction step length to obtain a new nozzle pressure set value; then, the new nozzle pressure set value is assigned to the current nozzle pressure set value in the step S701, so that the initial nozzle structure data and the initial mixing and expansion chamber structure data under the current working condition are recalculated by using the new nozzle pressure set value.

In step S703, the static pressure p is applied to the outlet of the extension chamber_dDelivery pipe inlet pressure p less than the currently specified specific value_eThen, the process proceeds to the next step S705. Step S705 deletes the current initial nozzle structure data and the initial mixing and expansion chamber structure data corresponding to the condition, and directly uses the previous group (corresponding to the previous depressurization operation) of nozzle structure data and mixing and expansion chamber structure data as the initial data group of the device combination structure data under the current operating condition. In this way, it is determined that a set of device combination structure data before the determination condition described in step S703 is satisfied is the optimal device combination structure data that meets the efficient use of ejection energy. Thus, the device combination configuration data corresponding to the current specified operation condition is obtained through the above steps S701 to S705. Wherein the mixing chamber aspect ratio data required within the plant portfolio configuration data may be obtained empirically.

Further, in order to improve the accuracy of the length-diameter ratio data of the mixing chamber, and thus improve the overall accuracy of the combined structure data of the device, in a preferred embodiment of the present invention, the length-diameter ratio data of the mixing chamber may be obtained by generating an in-device gas motion model simulating the current specified operating condition through simulation software. With continuing reference to fig. 7, after step S705, step S706 and step S707 are also included.

Step S706 obtains a plurality of groups of mixing chamber length-diameter ratio data, and based on the obtained data, by combining the initial data group obtained in the step S705, a three-dimensional numerical simulation software is adopted to respectively establish a corresponding ejector three-dimensional model for each group of mixing chamber length-diameter ratio data, and a corresponding device flow field cloud chart is obtained. The device flow field cloud chart comprises a flow field velocity cloud chart, a pressure cloud chart and a temperature cloud chart respectively. The cloud picture of the flow field of the device is a three-dimensional model, and the model shows the cloud picture of the aerodynamic field of the injected gas and the injected gas in the injection device in the mixed flowing process under the current specified working condition, and can respectively show the speed distribution condition, the pressure distribution condition and the temperature distribution condition of the flow field at different positions in the device.

Then, in step S707, first, a device flow field cloud image with uniform velocity field distribution at the outlet cross section of the mixing chamber is initially selected from the device flow field cloud images, then, a device flow field cloud image with the shortest mixing chamber length is selected again from the device flow field cloud images subjected to the initial screening, and the mixing chamber length-diameter ratio corresponding to the finally selected device flow field cloud image is written into the device composite structure data obtained in step S705, so that more accurate device composite structure data for the current specified working condition is obtained.

When the injection device is put into use, the optimal nozzle structure data and the optimal mixing and expansion chamber structure data are selected according to the actual working conditions and a pre-constructed device geometric parameter table so as to achieve the optimal injection efficiency. When the actual working condition of the injection technology implementation environment is obviously changed, the device combination structure data is timely reselected, and a nozzle component, a mixing and diffusing chamber component which are suitable for the new working condition environment in the injection device are replaced.

The invention provides a replaceable injection device. The device is characterized in that the nozzle component, the mixing and diffusion chamber component and the shell are constructed in a detachable mode; analyzing and classifying the specification parameters of different injection devices to construct a device geometric parameter table which can adapt to the injection technology implementation environment; the corresponding nozzle component structure data and mixing and expanding chamber structure data under different working conditions recorded in the table form a solid component series of a plurality of sets of nozzles, mixing and expanding chambers, and a uniform specification ejector device applicable to wider operating conditions is established. The invention can overcome the problems of medium and low pressure gas well pressurized exploitation, high and low pressure well mixed transportation and narrow application range of the traditional ejector in the production of natural gas fields, can obviously expand the application working condition range of the ejector, enables the design and processing of the ejector of the target gas field gas well to be batched and generalized, and reduces the design, processing and production cost. In addition, due to the adoption of the ejector device with the replaceable nozzle and the mixing and expanding chamber, the working condition range of the ejector device is expanded, the service cycle of the device can be prolonged, and the maintenance, installation and other costs of equipment are further reduced.

The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.

Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.

Although the embodiments of the present invention have been described above, the above descriptions are only for the convenience of understanding the present invention, and are not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.