阅读说明：本技术 变流量压力注水装置 (Variable flow pressure water injection device ) 是由 刘挺 刘丽群 韩连福 曹志民 吴云 张哲� 于 2020-04-13 设计创作，主要内容包括：本发明公开了一种变流量压力注水装置,包括：旋流器,具有呈一定角度设置的入口端和出口端,入口端能连接注水泵；与旋流器的出口端相连的振动发生器,其具有：上端与旋流器的出口端相连的注水筒,注水筒的下部筒壁上设有多个射孔；位于注水筒内的活塞结构,其具有活塞筒及活塞件,活塞筒与注水筒之间形成有旋流通道,注水筒的上端能通过旋流通道与多个射孔相连通,活塞件的上端能密封滑动地设置在活塞筒内,活塞件的下端伸出活塞筒并能密封滑动地设置在注水筒的下部筒壁内。本发明通过旋流器控制注入振动发生器中的水的压力,从而使水能从不同的射孔进入不同油层,进而保证油层中的压力满足开采条件,其设计简单、操作方便且能提高油田采收率。(The invention discloses a variable flow pressure water injection device, which comprises: the cyclone is provided with an inlet end and an outlet end which are arranged at a certain angle, and the inlet end can be connected with a water injection pump; a vibration generator connected to the outlet end of the cyclone, having: the upper end of the water injection barrel is connected with the outlet end of the cyclone, and the lower barrel wall of the water injection barrel is provided with a plurality of perforations; the piston structure is positioned in the water injection cylinder and provided with a piston cylinder and a piston piece, a rotational flow channel is formed between the piston cylinder and the water injection cylinder, the upper end of the water injection cylinder can be communicated with a plurality of perforation holes through the rotational flow channel, the upper end of the piston piece can be arranged in the piston cylinder in a sealing and sliding manner, and the lower end of the piston piece extends out of the piston cylinder and can be arranged in the lower cylinder wall of the water injection cylinder in a sealing and sliding manner. The invention controls the pressure of water injected into the vibration generator through the swirler, so that the water can enter different oil layers from different perforations, thereby ensuring that the pressure in the oil layers meets the exploitation conditions.)

1. A variable flow pressure water injection device is characterized by comprising: the cyclone is provided with an inlet end and an outlet end which are arranged at a certain angle, and the inlet end can be connected with a water injection pump;

a vibration generator connected to the outlet end of the cyclone, the vibration generator having:

the upper end of the water injection barrel is connected with the outlet end of the swirler, and a plurality of perforations are arranged on the lower barrel wall of the water injection barrel;

the piston structure is positioned in the water injection cylinder and provided with a piston cylinder and a piston piece, a rotational flow channel is formed between the piston cylinder and the water injection cylinder, the upper end of the water injection cylinder can be communicated with the plurality of perforation holes through the rotational flow channel, the upper end of the piston piece can be arranged in the piston cylinder in a sealing and sliding manner, and the lower end of the piston piece extends out of the piston cylinder and can be arranged in the lower cylinder wall of the water injection cylinder in a sealing and sliding manner.

2. The variable flow rate pressure water injection apparatus according to claim 1, wherein an upper stopper and a lower stopper are provided on an inner wall of the piston cylinder, the upper stopper being located above the lower stopper, an upper sliding seal member being formed at an upper end of the piston member, the upper sliding seal member being provided so as to be sealingly slidable in the piston cylinder between the upper stopper and the lower stopper.

3. The variable-flow pressure water injection device according to claim 2, wherein a lower sliding seal member is formed at a lower end of the piston member, the lower sliding seal member is slidably and sealingly disposed in a lower wall of the water injection tube, the lower sliding seal member is provided with a plurality of flow guide holes, and the swirling flow channel is capable of communicating with the plurality of perforations through the plurality of flow guide holes.

4. The variable flow rate pressure water injection apparatus according to claim 3, wherein in a state where the upper sliding seal abuts against the upper stopper, the lower sliding seal is located above the plurality of perforations, and the swirl flow channel communicates with the plurality of perforations through the plurality of flow guide holes; when the upper sliding sealing element is abutted to the lower limiting element, one part of the plurality of perforations is located above the lower sliding sealing element, the other part of the plurality of perforations is located below the lower sliding sealing element, the swirling flow channel can be communicated with the plurality of perforations located above the lower sliding sealing element, and the swirling flow channel can be communicated with the plurality of perforations located below the lower sliding sealing element through the plurality of flow guide holes.

5. The variable flow rate pressure water injection apparatus according to claim 1, wherein a plurality of perforation groups are provided at intervals along an axial direction of the lower wall of the water injection cartridge, and each perforation group includes a plurality of perforations provided at intervals along a circumferential direction of the water injection cartridge.

6. The variable flow pressure water injection device according to claim 3, wherein a plug is further disposed in the water injection cylinder, the plug is located between the piston cylinder and the lower sliding seal of the piston, the plug forms an inner channel, an upper end of the inner channel can communicate with the swirling flow channel, and a lower end of the inner channel is disposed opposite to the plurality of flow guide holes.

7. The variable flow rate pressure water injection apparatus according to claim 6, wherein the lower end of the piston cylinder is connected to the plug by a plurality of lower connecting members, a lower water inlet is formed between every two adjacent lower connecting members, and the swirl flow channel is communicated with the inner channel of the plug by a plurality of lower water inlets.

8. The variable flow pressure water injection apparatus according to claim 1, wherein the upper end of the piston cylinder is connected to the inner wall of the upper portion of the water injection cylinder through a plurality of upper connection members, upper water inlets are formed between every two adjacent upper connection members, and the upper end of the water injection cylinder can communicate with the swirl passage through the plurality of upper water inlets.

9. The variable flow rate pressure water injection apparatus according to claim 1, wherein a lower end of the piston member abuts against a bottom of the water injection cylinder through an elastic member.

10. The variable flow pressure water injection apparatus according to claim 1, wherein the cyclone comprises:

the inlet end is formed at one end of the cyclone cylinder, and the outlet end is formed on the pipe wall of the cyclone cylinder;

and the screw is rotatably arranged in the cyclone cylinder, and the axial direction of the screw is opposite to the inlet end.

11. The variable flow rate pressure water injection apparatus according to claim 1 or 10, wherein a center line of the outlet port is perpendicular to a center line of the inlet port.

Technical Field

The invention relates to the technical field of oilfield water injection, in particular to a variable flow pressure water injection device.

Background

After the oil field is put into development, the energy of the oil layer is continuously consumed along with the increase of the exploitation time, so that the pressure of the oil layer is continuously reduced, underground crude oil is greatly degassed, the viscosity is increased, the yield of the oil well is greatly reduced, even the injection and production stop can be realized, and a large amount of underground residual dead oil cannot be extracted. In order to compensate for the underground deficit caused by the production of crude oil, maintain or increase the pressure of an oil reservoir, realize high and stable yield of an oil field and obtain higher recovery efficiency, water injection must be carried out on the oil field to maintain the pressure of the oil reservoir, and the process is called oil field water injection. Oilfield flooding is one of the important means for supplementing energy to the stratum and improving the oilfield recovery ratio in the oilfield development process. The level of the water injection well management technology determines the development effect of the oil field and also determines the development service life of the oil field.

The initial stage of the water injection process is limited by a pipe column and technology, and the main point of the water injection process is the general water injection process, namely water is directly injected into a stratum from an oil pipe, the water is not controlled and naturally shunted underground, and the total injection amount of a single well can be controlled only on the ground. Because the permeability difference of each mining small layer is very large, the injected water is often fast to advance along the high permeability layer, and the phenomenon of single-layer outburst is serious, so that the water content of the produced liquid of the oil well is increased, and the ineffective water injection is increased. This serious drawback has led to the development of the stratified water flooding process objectively.

Oil jacket separate injection is the simplest separate injection mode, but only two-layer separate injection can be realized, the oil displacement effect is limited, and the oil jacket separate injection is gradually eliminated. The number of layers is not limited in theory by eccentric water injection, but two layers are not too subdivided, and the adjacent layer sections smaller than 5m can cause difficulty in seat layer identification and operation. The method of throwing and fishing the blanking plug and manually replacing water nozzles with different apertures is adopted for flow allocation in the early stage of eccentric water injection, which wastes time and labor and has low efficiency and is eliminated. The hollow water injection technology is only used in a victory oil field and is difficult to popularize in other oil fields because the throwing and fishing load is large, the rubber sealing element is easy to fall off, the number of layers is small, and the number of layers is at most 4.

Disclosure of Invention

The invention aims to provide a variable flow pressure water injection device, which is used for solving the problems of difficult operation, low efficiency and low oil field recovery ratio of the existing oil layer water injection process.

The above object of the present invention can be achieved by the following technical solutions:

the invention provides a variable flow pressure water injection device, comprising: the cyclone is provided with an inlet end and an outlet end which are arranged at a certain angle, and the inlet end can be connected with a water injection pump; a vibration generator connected to the outlet end of the cyclone, the vibration generator having: the upper end of the water injection barrel is connected with the outlet end of the swirler, and a plurality of perforations are arranged on the lower barrel wall of the water injection barrel; the piston structure is positioned in the water injection cylinder and provided with a piston cylinder and a piston piece, a rotational flow channel is formed between the piston cylinder and the water injection cylinder, the upper end of the water injection cylinder can be communicated with the plurality of perforation holes through the rotational flow channel, the upper end of the piston piece can be arranged in the piston cylinder in a sealing and sliding manner, and the lower end of the piston piece extends out of the piston cylinder and can be arranged in the lower cylinder wall of the water injection cylinder in a sealing and sliding manner.

Preferably, wherein, be equipped with spacing piece and lower spacing piece on the inner wall of piston cylinder, go up the spacing piece and be located the top of spacing piece down, the upper end of piston piece is formed with sliding seal spare, sliding seal spare can go up spacing piece with between the spacing piece down the piston cylinder is interior to be set up with sealed sliding.

Preferably, a lower sliding sealing part is formed at the lower end of the piston part, the lower sliding sealing part can be arranged in the lower cylinder wall of the water injection cylinder in a sealing and sliding manner, a plurality of flow guide holes are formed in the lower sliding sealing part, and the rotational flow channel can be communicated with the plurality of perforation holes through the plurality of flow guide holes.

Preferably, in a state where the upper sliding seal abuts against the upper stopper, the lower sliding seal is located above the plurality of perforations, and the swirling flow channel communicates with the plurality of perforations through the plurality of flow guide holes; when the upper sliding sealing element is abutted to the lower limiting element, one part of the plurality of perforations is located above the lower sliding sealing element, the other part of the plurality of perforations is located below the lower sliding sealing element, the swirling flow channel can be communicated with the plurality of perforations located above the lower sliding sealing element, and the swirling flow channel can be communicated with the plurality of perforations located below the lower sliding sealing element through the plurality of flow guide holes.

Preferably, a plurality of perforation groups are arranged on the lower cylinder wall of the water injection cylinder at intervals along the axial direction of the water injection cylinder, and each perforation group comprises a plurality of perforations arranged at intervals along the circumferential direction of the water injection cylinder.

Preferably, a plug is further arranged in the water injection cylinder, the plug is located between the piston cylinder and a lower sliding sealing element of the piston element, an inner channel is formed on the plug, the upper end of the inner channel can be communicated with the rotational flow channel, and the lower end of the inner channel is opposite to the plurality of flow guide holes.

Preferably, the lower end of the piston cylinder is connected with the plug through a plurality of lower connecting pieces, a lower water inlet is formed between every two adjacent lower connecting pieces, and the swirl channel is communicated with the inner channel of the plug through the plurality of lower water inlets.

Preferably, the upper end of the piston cylinder is connected to the inner wall of the upper part of the water injection cylinder through a plurality of upper connecting pieces, an upper water inlet is formed between every two adjacent upper connecting pieces, and the upper end of the water injection cylinder can be communicated with the cyclone channel through a plurality of upper water inlets.

Preferably, the lower end of the piston member abuts against the bottom of the water injection tube through an elastic member.

Preferably, the cyclone comprises: the inlet end is formed at one end of the cyclone cylinder, and the outlet end is formed on the pipe wall of the cyclone cylinder; and the screw is rotatably arranged in the cyclone cylinder, and the axial direction of the screw is opposite to the inlet end.

Preferably, the center line of the outlet end is perpendicular to the center line of the inlet end.

The invention has the characteristics and advantages that:

the invention controls the pressure of the injected water conveyed to the vibration generator through the swirler, and enables the injected water to enter the corresponding oil layer from a plurality of perforations at different depth positions in the water injection cylinder through the piston structure of the vibration generator, thereby ensuring that the pressure in each oil layer meets the exploitation conditions.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an initial state of a variable flow pressure water injection device according to the present invention;

FIG. 2 is a schematic structural view of another embodiment of the vibration generator of the present invention;

FIG. 3 is a cross-sectional view taken along line "A-A" in FIG. 1;

FIG. 4 is a cross-sectional view taken along line "B-B" in FIG. 1.

Reference numerals and description:

100. a variable flow pressure water injection device; 10. a swirler; 11. a cyclone cylinder; 111. an inlet end; 12. a tube wall; 121. an outlet end; 13. a screw; 20. a water injection pump; 30. a vibration generator; 31. a water injection barrel; 311. a cylinder wall; 312. perforation group; 3121. perforating; 32. a piston structure; 321. a piston cylinder; 3211. an upper limiting member; 3212. a lower retainer; 322. a piston member; 3221. an upper sliding seal; 3222. a lower sliding seal; 3223. a rod member; 33. a swirling flow passage; 34. a flow guide hole; 35. plugging with a thread; 351. an inner channel; 36. a lower connecting piece; 361. a lower water inlet; 37. an upper connecting piece; 371. an upper water inlet; 38. an elastic member; l1, center line of inlet end; l2, center line of outlet end.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The present invention provides a variable flow rate pressure water injection apparatus 100, referring to fig. 1 to 4, comprising a cyclone 10 and a vibration generator 30. The cyclone 10 has an inlet end 111 and an outlet end 121 which are arranged at a certain angle, and the inlet end 111 can be connected with a water injection pump 20; a vibration generator 30 is connected to the outlet end 121 of the cyclone 10. The vibration generator 30 is provided with a water injection cylinder 31 and a piston structure 32, the upper end of the water injection cylinder 31 is connected with the outlet end 121 of the swirler 10, and a plurality of perforations 3121 are arranged on the lower cylinder wall 311 of the water injection cylinder 31; the piston structure 32 is located in the water injection cylinder 31, the piston structure 32 has a piston cylinder 321 and a piston member 322, a swirl passage 33 is formed between the piston cylinder 321 and the water injection cylinder 31, the upper end of the water injection cylinder 31 can communicate with the plurality of perforations 3121 through the swirl passage 33, the upper end of the piston member 322 can be sealingly slidably disposed in the piston cylinder 321, and the lower end of the piston member 322 extends out of the piston cylinder 321 and can be sealingly slidably disposed in the lower cylinder wall 311 of the water injection cylinder 31.

The invention controls the pressure of the injected water conveyed to the vibration generator 30 through the swirler 10, and enables the injected water to enter the corresponding oil layer from a plurality of perforation 3121 at different depth positions in the water injection cylinder 31 through the piston structure 32 of the vibration generator 30, thereby ensuring that the pressure in each oil layer meets the exploitation conditions.

In the present invention, referring to fig. 1 and 2, an upper stopper 3211 and a lower stopper 3212 are disposed on an inner wall of the piston cylinder 321, the upper stopper 3211 is located above the lower stopper 3212, an upper sliding seal 3221 is formed at an upper end of the piston 322, and the upper sliding seal 3221 can be disposed in the piston cylinder 321 between the upper stopper 3211 and the lower stopper 3212 in a sealing and sliding manner.

Further, a lower sliding seal 3222 is formed at the lower end of the piston member 322, the lower sliding seal 3222 can be arranged in the lower cylinder wall 311 of the water injection cylinder 31 in a sealing and sliding manner, a plurality of guiding holes 34 are formed in the lower sliding seal 3222, and the swirling flow channel 33 can be communicated with the plurality of perforations 3121 through the plurality of guiding holes 34.

Specifically, the upper sliding seal 3221 and the lower sliding seal 3222 are made of plate bodies with a certain thickness, and the two sliding seal bodies are connected and fixed by the rod 3223, so that the structure is simple, and load transfer is more stable. In this embodiment, the rod 3223 has an outer diameter less than the outer diameter of the upper wiper seal 3221, and the rod 3223 has an outer diameter less than the outer diameter of the lower wiper seal 3222.

The invention has at least the following two states: in an initial state, please refer to fig. 1, the upper sliding seal 3221 abuts against the upper stopper 3211, and the lower sliding seal 3222 is located above the plurality of perforations 3121 at the lower portion of the water injection cylinder 31, at which time, the swirling flow channel 33 is communicated with the plurality of perforations 3121 through the plurality of guiding holes 34. In this state, after entering the water injection tube 31 from the outlet end 121 of the swirler 10, the injected water enters the water injection tube 31 below the lower sliding seal 3222 through the plurality of guiding holes 34 along the swirling flow passage 33, and is injected into the corresponding oil layer through the plurality of perforations 3121 to increase the oil layer pressure at the corresponding position.

When the injected water continuously enters the water injection barrel 31 from the outlet end 121 of the cyclone 10, that is, as the amount of the injected water increases, the pressure of the injected water applied to the upper sliding sealing member 3221 also increases, thereby pushing the piston member 322 to slide downward to a predetermined position, the present invention is in another state, see fig. 2. In this state, the upper sliding seal 3221 abuts against the lower retainer 3212, or the upper sliding seal 3221 is located between the upper retainer 3211 and the lower retainer 3212, at which time, a portion of the plurality of perforations 3121 is located above the lower sliding seal 3222, another portion of the plurality of perforations 3121 is located below the lower sliding seal 3222, the swirling flow channel 33 can communicate with the plurality of perforations 3121 located above the lower sliding seal 3222, and the swirling flow channel 33 can communicate with the plurality of perforations 3121 located below the lower sliding seal 3222 through the plurality of guiding holes 34. In this state, the injected water enters the water injection barrel 31 from the outlet end 121 of the swirler 10 and then flows to the upper surface of the lower sliding seal 3222 along the swirling flow channel 33, at this time, the injected water is divided into two paths of water, one path of water enters the water injection barrel 31 positioned below the lower sliding seal 3222 through the plurality of flow guide holes 34 and is injected into the corresponding oil layer through the perforations 3121 on the lower barrel wall 311, and the other path of injected water is injected into the corresponding oil layer directly through the plurality of perforations 3121 positioned above the lower sliding seal 3222 along the upper surface of the lower sliding seal 3222; the two paths of injected water can increase the oil reservoir pressure at the positions corresponding to the perforations 3121, so that the oil field recovery ratio is improved conveniently, and the separate layer water injection of the oil field can be realized.

In some embodiments, referring to fig. 1 and 2, a plurality of perforation sets 312 are spaced along the axial direction of the lower wall 311 of the water injection cylinder 31, and each perforation set 312 includes a plurality of perforations 3121 spaced along the circumferential direction of the water injection cylinder 31. In this embodiment, the injected water can enter the plurality of perforations 3121 in the same perforation group 312 at the same time, so that the water injection efficiency of the oil layer can be improved, and the injected water is more uniform and safer.

In the present invention, referring to fig. 1 and 2, a plug 35 is further disposed in the water injection cylinder 31, the plug 35 is located between the piston cylinder 321 and the lower sliding seal 3222 of the piston member 322, the plug 35 forms an inner channel 351, an upper end of the inner channel 351 can communicate with the swirling flow channel 33, and a lower end of the inner channel 351 is disposed opposite to the plurality of guiding holes 34.

In this embodiment, by providing the plug 35, the injection water in the swirling flow channel 33 can be guided to the plurality of guiding holes 34 of the lower sliding seal 3222, so that the injection water can rapidly flow into the perforation 3121 from the plurality of guiding holes 34.

Further, referring to fig. 1, 2 and 4, the lower end of the piston cylinder 321 is connected to the plug 35 through a plurality of lower connecting members 36, a lower water inlet 361 is formed between every two adjacent lower connecting members 36, and the swirl passage 33 is communicated with an inner passage 351 of the plug 35 through the plurality of lower water inlets 361.

Further, referring to fig. 1 to 3, the upper end of the piston cylinder 321 is connected to the inner wall of the upper portion of the water injection cylinder 31 through a plurality of upper connection members 37, an upper water inlet 371 is formed between every two adjacent upper connection members 37, and the upper end of the water injection cylinder 31 can be communicated with the cyclone passage 33 through a plurality of upper water inlets 371. Specifically, the inner diameter of the upper wall of the water injection tube 31 is smaller than the inner diameter of the middle wall of the water injection tube 31, and the piston tube 321 is located in the middle of the water injection tube 31, so that an annular rotational flow passage 33 is formed between the piston tube 321 and the water injection tube 31, and in this embodiment, the inner diameter of the piston tube 321 may be the same as the inner diameter of the upper wall of the water injection tube 31, thereby facilitating connection of the plurality of upper connectors 37 between the upper end of the piston tube 321 and the upper wall of the water injection tube 31.

In some preferred embodiments, the lower link 36 and the upper link 37 are both connecting rods, and the number of the lower link 36 and the number of the upper link 37 are both 4. In the present invention, the number of the lower connecting members 36 and the upper connecting members 37 may be adjusted according to actual conditions, and is not limited herein. In addition, the number of lower and upper connections 36 and 37 may also be different, thereby achieving adjustment of the amount of water injected into the cyclone passage 33 or the perforations 3121.

In order to ensure that the upper sliding sealing member 3221 can slide in a sealing manner in the piston cylinder 321 between the upper limiting member 3211 and the lower limiting member 3212, in some embodiments, please refer to fig. 1 and 2, the lower end of the piston member 322 abuts against the bottom of the water injection cylinder 31 through the elastic member 38. Therefore, after the oil layer is injected with water after the upper sliding sealing element 3221 slides downwards to the preset position, the elastic element 38 can drive the upper sliding sealing element 3221 to return to the initial position after the water injection is stopped, so that the effect of repeatedly injecting water into the oil field can be achieved without any subsequent auxiliary operation of workers.

In some embodiments, referring to fig. 1, the cyclone 10 includes a cyclone barrel 11 and a screw 13. Specifically, an inlet end 111 is formed at one end of the cyclone cylinder 11, and an outlet end 121 is formed on the pipe wall 12 of the cyclone cylinder 11; the screw 13 is rotatably provided in the cyclone tube 11, and the axial direction of the screw 13 is disposed opposite to the inlet end 111.

In this embodiment, the rotation speed of the screw 13 is adjusted to adjust the speed of the water output from the cyclone 10, so as to achieve the purpose of adjusting the water pressure and flow rate of the injected water. In some preferred embodiments, the center line L2 of the outlet end 121 is perpendicular to the center line L1 of the inlet end 111, so as to ensure that the injected water can be directly output at a certain speed after being disturbed by the screw 13, thereby reducing energy loss and reducing the use cost of the product.

The above are only a few embodiments of the present invention, and those skilled in the art can make various changes or modifications to the embodiments of the present invention according to the disclosure of the application document without departing from the spirit and scope of the present invention.