阅读说明：本技术 一种套管气回收系统 (Sleeve gas recovery system ) 是由 崔王卿 徐标 夏刚 郝明明 于 2019-11-14 设计创作，主要内容包括：本发明属于采油工程技术领域,公开了一种套管气回收系统,包括：套管气排出组件,所述套管气排出组件包括套管气管道和油气混输泵,所述油气混输泵设置于所述套管气管道上,所述套管气管道的一端与套管连通,用于排出所述套管中的套管气；原油排出组件,所述原油排出组件包括原油排出管道,所述原油排出管道的一端与油管连通,用于排出所述油管中的原油；汇合组件,所述汇合组件包括混合器,所述混合器与输油管道连通,所述套管气管道的另一端和所述原油排出组件的另一端均连通于所述混合器。通过上述结构,该套管气回收系统能够将套管气排出并回收,能够有效降低套管内的气压,保证油井生产效率。(The invention belongs to the technical field of oil extraction engineering, and discloses a casing gas recovery system, which comprises: the casing gas discharge assembly comprises a casing gas pipeline and an oil-gas multiphase pump, the oil-gas multiphase pump is arranged on the casing gas pipeline, and one end of the casing gas pipeline is communicated with the casing and used for discharging the casing gas in the casing; the crude oil discharge assembly comprises a crude oil discharge pipeline, one end of the crude oil discharge pipeline is communicated with an oil pipe and is used for discharging crude oil in the oil pipe; converge the subassembly, it includes the blender to converge the subassembly, blender and oil pipeline intercommunication, the other end of sleeve pipe gas pipeline with the other end of crude oil discharge assembly all communicate in the blender. Through the structure, the casing gas recovery system can discharge and recover the casing gas, can effectively reduce the pressure in the casing, and ensures the production efficiency of an oil well.)

1. A casing gas recovery system, comprising:

the sleeve gas discharging assembly (1), the sleeve gas discharging assembly (1) comprises a sleeve gas pipeline (11) and an oil-gas mixed transportation pump (12), the oil-gas mixed transportation pump (12) is arranged on the sleeve gas pipeline (11), and one end of the sleeve gas pipeline (11) is communicated with a sleeve and used for discharging sleeve gas in the sleeve;

the crude oil discharge assembly (2), the crude oil discharge assembly (2) comprises a crude oil discharge pipeline (21), one end of the crude oil discharge pipeline (21) is communicated with an oil pipe and is used for discharging crude oil in the oil pipe;

converge subassembly (3), converge subassembly (3) including blender (31), blender (31) and oil pipeline intercommunication, the other end of sleeve pipe gas pipeline (11) with the other end of crude oil discharge assembly (2) all communicate in blender (31).

2. The casing gas recovery system according to claim 1, wherein the casing gas discharge assembly (1) further comprises an inlet pressure transmitter (13), the inlet pressure transmitter (13) being mounted on the casing gas pipeline (11) upstream of the oil and gas multiphase pump (12) for detecting the gas pressure in the casing gas pipeline (11).

3. The casing gas recovery system of claim 2, wherein the casing gas vent assembly (1) further comprises a casing gas check valve (14), the casing gas check valve (14) being disposed on the casing gas pipeline (11) and between the oil and gas multiphase pump (12) and the inlet pressure transmitter (13).

4. Casing gas recovery system according to claim 2, wherein the casing gas discharge assembly (1) further comprises a first valve (15), the first valve (15) being arranged on the casing gas duct (11) upstream of the inlet pressure transmitter (13).

5. Casing gas recovery system according to claim 1, characterized in that the other end of the crude oil discharge conduit (21) communicates with the mixer (31).

6. Casing gas recovery system according to claim 1, wherein the crude oil discharge assembly (2) further comprises a crude oil check valve (22), the crude oil check valve (22) being arranged on the crude oil discharge conduit (21).

7. Casing gas recovery system according to claim 1, wherein the crude oil discharge assembly (2) further comprises a mass flow meter (23), the mass flow meter (23) being arranged on the crude oil discharge conduit (21).

8. Casing gas recovery system according to claim 1, wherein the junction assembly (3) further comprises an outlet pressure transmitter (32), the outlet pressure transmitter (32) being mounted on the mixer (31).

9. Casing gas recovery system according to claim 1, wherein the junction assembly (3) further comprises a recovery conduit (33), one end of the recovery conduit (33) being in communication with the mixer (31) and the other end being in communication with an oil delivery conduit via a connection valve (34).

10. Casing gas recovery system according to claim 1, wherein the junction assembly (3) further comprises a blowdown conduit (35), one end of the blowdown conduit (35) communicating with the bottom of the mixer (31) for blowdown of the mixer (31).

Technical Field

The invention relates to the technical field of oil extraction engineering, in particular to a casing gas recovery system.

Background

An oil well generally comprises two parts, a tubing for conveying fluids to the surface under the action of a pump, and a casing which is sleeved on the tubing for supporting the wall of the oil well. During well production, when the bottom hole pressure of the well is lower than the bubble point pressure of the fluid pressure in the well, the fluid in the well may generate well-separated gas into the casing, which is called casing gas. Along with the increase of separated gas generated by the fluid in the oil well, the pressure of the casing gas can be continuously increased, and the oil well can generate a gas lock phenomenon due to overhigh pressure of the casing gas, so that the pump can not normally pump the oil well fluid. Therefore, it is necessary to periodically discharge the sheath gas to reduce the pressure thereof.

At present, one of common casing gas discharge methods for oil wells is direct air discharge, and because the main components of casing gas are compounds such as methane, carbon monoxide, hydrogen sulfide and the like, the method not only pollutes the environment, but also causes waste of a large amount of resources; the other method is to directly communicate the casing with the oil pipe and directly discharge the casing gas into the oil pipe, and the casing gas cannot be completely discharged due to the influence of the back pressure of the oil pipe, so that the pressure reduction effect is not obvious, and the utilization rate of the casing gas is low.

Disclosure of Invention

The invention aims to provide a casing gas recovery system which can discharge and recover casing gas, effectively reduce the air pressure in a casing and ensure the production efficiency of an oil well.

In order to achieve the purpose, the invention adopts the following technical scheme:

a casing gas recovery system comprising:

the casing gas discharge assembly comprises a casing gas pipeline and an oil-gas multiphase pump, the oil-gas multiphase pump is arranged on the casing gas pipeline, and one end of the casing gas pipeline is communicated with the casing and used for discharging the casing gas in the casing;

the crude oil discharge assembly comprises a crude oil discharge pipeline, one end of the crude oil discharge pipeline is communicated with an oil pipe and is used for discharging crude oil in the oil pipe;

converge the subassembly, it includes the blender to converge the subassembly, blender and oil pipeline intercommunication, the other end of sleeve pipe gas pipeline with the other end of crude oil discharge assembly all communicate in the blender.

Preferably, the casing gas discharge assembly further comprises an inlet pressure transmitter, wherein the inlet pressure transmitter is mounted on the casing gas pipeline and located at the upstream of the oil-gas multiphase pump and used for detecting the gas pressure in the casing gas pipeline.

Preferably, the casing gas discharge assembly further comprises a casing gas one-way valve, and the casing gas one-way valve is arranged on the casing gas pipeline and is located between the oil-gas multiphase pump and the inlet pressure transmitter.

Preferably, the casing gas vent assembly further comprises a first valve disposed on the casing gas conduit upstream of the inlet pressure transmitter.

Preferably, the other end of the crude oil discharge pipe is communicated with the mixer.

Preferably, the crude oil discharge assembly further comprises a crude oil check valve, and the crude oil check valve is arranged on the crude oil discharge pipeline.

Preferably, the crude oil discharge assembly further comprises a mass flow meter, and the mass flow meter is arranged on the crude oil discharge pipeline.

Preferably, the junction assembly further comprises an outlet pressure transducer mounted on the mixer.

Preferably, the confluence assembly further comprises a recycling pipeline, one end of the recycling pipeline is communicated with the mixer, and the other end of the recycling pipeline is communicated with the oil pipeline through the connecting valve.

Preferably, the confluence assembly further comprises a sewage drain pipe, one end of which is communicated with the bottom of the mixer for draining sewage from the mixer.

The invention has the beneficial effects that:

the invention provides a casing gas recovery system which comprises a casing gas discharge assembly, a crude oil discharge assembly and a confluence assembly. One end of the casing gas discharge assembly is communicated with the casing, the other end of the casing gas discharge assembly is communicated with the converging assembly, and the casing gas discharge assembly conveys casing gas into a mixer of the converging assembly through an oil-gas mixed conveying pump; one end of the crude oil discharge assembly is communicated with the oil pipe, the other end of the crude oil discharge assembly is also communicated with the mixer, the mixer mixes the casing gas and the crude oil together and then feeds the casing gas into the oil pipeline, finally, the casing gas is recovered and discharged, the air pressure in the casing can be effectively reduced, and the production efficiency of an oil well is ensured.

Drawings

Fig. 1 is a schematic structural diagram of a casing gas recovery system according to an embodiment of the present invention.

In the figure:

1. a cannula gas discharge assembly; 11. a casing gas conduit; 12. an oil-gas mixed transportation pump; 13. an inlet pressure transmitter; 14. a sleeve gas check valve; 15. a first valve; 16. a casing gas inlet valve;

2. a crude oil discharge assembly; 21. a crude oil discharge conduit; 22. a crude oil check valve; 23. a mass flow meter; 24. a crude oil inlet valve;

3. a converging component; 31. a mixer; 32. an outlet pressure transmitter; 33. a recovery pipeline; 34. a connecting valve; 35. a blowdown line; 36. a blowoff valve; 4. and a controller.

Detailed Description

In order to make the technical problems solved, technical solutions adopted and technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.

The invention provides a casing gas recovery system, which comprises a casing gas discharge assembly 1, a crude oil discharge assembly 2 and a confluence assembly 3 as shown in figure 1. One end of the sleeve gas discharge assembly 1 is communicated with the sleeve, the other end of the sleeve gas discharge assembly is communicated with the converging assembly 3, and sleeve gas can be conveyed into the converging assembly 3; the one end of crude oil discharge assembly 2 communicates in oil pipe, and the other end communicates in converging subassembly 3, can carry crude oil to converging in subassembly 3, converges subassembly 3 and oil pipeline intercommunication, can carry to oil pipeline together after mixing sleeve pipe gas and crude oil, realizes the recovery and the discharge of sleeve pipe gas. This sleeve pipe gas recovery system can thoroughly discharge the sleeve pipe gas in the sleeve pipe, effectively reduces the atmospheric pressure in the sleeve pipe, but also can carry out recycle to discharged sleeve pipe gas, can avoid the waste of resource.

Specifically, sleeve pipe gas discharge assembly 1 includes sleeve pipe gas pipeline 11 and oil gas multiphase pump 12, oil gas multiphase pump 12 sets up on sleeve pipe gas pipeline 11, the one end of sleeve pipe gas pipeline 11 communicates in the sleeve pipe, the other end communicates in converging subassembly 3, make sleeve pipe gas pipeline 11 can carry sleeve pipe gas to converging subassembly 3 from the sleeve pipe under oil gas multiphase pump 12's mandatory effect, make sleeve pipe gas in the sleeve pipe can thoroughly be discharged, make sleeve pipe internal gas pressure drop to an atmospheric pressure, not only be favorable to the reduction of sleeve pipe atmospheric pressure, can also fully retrieve sleeve pipe gas. Preferably, the casing gas pipeline 11 is communicated with the casing through a casing gas inlet valve 16, and is used for controlling whether the casing gas is communicated in the casing gas pipeline 11 or not. More preferably, the cannula gas discharge assembly 1 further comprises a cannula gas check valve 14, and the cannula gas check valve 14 is installed on the cannula gas conduit 11, so that the cannula gas in the cannula gas conduit 11 can only flow into the merging assembly 3 from the cannula in a single direction, thereby avoiding the backflow of the cannula gas and preventing the gas pressure in the cannula from rising again.

In this embodiment, the casing gas vent assembly 1 further comprises an inlet pressure transmitter 13, the inlet pressure transmitter 13 being mounted on the casing gas duct 11 for detecting the gas pressure in the casing gas duct 11. Preferably, inlet pressure transmitter 13 is installed in the upper reaches of sleeve pipe gas check valve 14, can detect the sleeve pipe gas pressure in the 14 upper reaches of sleeve pipe gas check valve, make when sleeve pipe gas pressure is higher than the setting value, start oil gas defeated pump 12 and carry the sleeve pipe gas to converging in subassembly 3, and then carry to oil pipeline and retrieve, can guarantee that the atmospheric pressure in the sleeve pipe is less than the setting value all the time, make the intraductal atmospheric pressure of sleeve pipe obtain effectively reducing, avoid the oil well to produce the airlock phenomenon, guarantee the production efficiency of oil well. More preferably, casing gas vent assembly 1 further includes a first valve 15, first valve 15 is disposed upstream of casing gas pipe 11 of inlet pressure transmitter 13, and first valve 15 is preferably an electric valve, so that casing gas pipe 11 can be quickly cut off in case of emergency, and danger is avoided.

In this embodiment, the crude oil discharging component 2 includes a crude oil discharging pipeline 21, one end of the crude oil discharging pipeline 21 is communicated with the converging component 3, and the other end is communicated with the oil pipe, so that crude oil conveyed in the oil pipe can enter the converging component 3 through the crude oil discharging pipeline 21, and then flows into the oil pipe together after being mixed with the casing gas. Preferably, the crude oil discharge pipe 21 is connected to the oil pipe through a crude oil inlet valve 24 for controlling whether the crude oil is connected to the crude oil discharge pipe 21. In this embodiment, the crude oil discharge assembly 2 further includes a crude oil check valve 22, and the crude oil check valve 22 is disposed on the crude oil discharge pipeline 21, so that crude oil in the crude oil discharge pipeline 21 can only flow into the confluence assembly 3 from the oil pipe in a one-way manner, and crude oil backflow caused by overlarge internal pressure of the confluence assembly 3 can be avoided, thereby affecting crude oil transportation. More preferably, the crude oil discharge assembly 2 further comprises a mass flow meter 23, and the mass flow meter 23 is installed in the crude oil discharge pipeline 21 and can measure oil from the oil pipe, so that the oil well yield can be counted conveniently.

Preferably, the merging assembly 3 includes a mixer 31, the casing gas pipeline 11 and the crude oil discharge pipeline 21 are both communicated with the mixer 31, and the mixer 31 is communicated with the oil pipeline, and is capable of mixing the casing gas delivered from the casing gas pipeline 11 and the crude oil delivered from the crude oil discharge pipeline 21, and delivering the mixed liquid to the oil pipeline. Preferably, the confluence module 3 further comprises a recycling pipe 33, wherein one end of the recycling pipe 33 is connected to the mixer 31, and the other end is connected to the oil pipeline, so as to facilitate the outward transportation of the mixed liquid from the mixer 31. More preferably, the recovery pipeline 33 is communicated with the oil pipeline through a connecting valve 34, so that the recovery pipeline 33 and the oil pipeline are conveniently connected, and the recovery pipeline 33 and the oil pipeline are conveniently disassembled. Further, the confluence module 3 further comprises an outlet pressure transmitter 32, wherein the outlet pressure transmitter 32 is disposed on the mixer 31 and is used for detecting the air pressure in the mixer 31 to prevent danger caused by overhigh pressure in the mixer 31. In this embodiment, the confluence module 3 further comprises a drain pipe 35, and one end of the drain pipe 35 is connected to the bottom of the mixer 31 for draining the contaminants deposited in the mixer 31. Preferably, the end of the sewage pipe 35 is provided with a sewage valve 36 for periodically opening the sewage pipe 35 to discharge the dirt in the mixer 31.

In this embodiment, the casing gas recovery system further comprises a controller 4, and the controller 4 is connected with the first valve 15, the inlet pressure transmitter 13, the mass flow meter 23, the oil-gas mixture transportation pump 12 and the outlet pressure transmitter 32. In this embodiment, the controller 4 may be a centralized or distributed controller, for example, the controller 4 may be a single-chip microcomputer or may be composed of a plurality of distributed single-chip microcomputers, a control program may be run in the single-chip microcomputers, and the controller 4 may receive signals of the inlet pressure transmitter 13, the mass flow meter 23, and the outlet pressure transmitter 32, and control the first valve 15 and the oil-gas mixture transfer pump 12 to implement the functions thereof.

The operation of the casing gas recovery system provided in this embodiment will be described below.

When the casing gas recovery system works normally, the casing gas inlet valve 16, the first valve 15 and the crude oil inlet valve 24 are all in an open state, when the inlet pressure transmitter 13 detects that the casing gas pressure in the casing gas pipeline 11 reaches a preset value, a signal is fed back to the controller 4, the controller 4 sends a signal to start the oil-gas transport pump 12, and the casing gas enters the mixer 31 from the casing gas pipeline 11 under the action of the oil-gas transport pump 12; meanwhile, the crude oil in the crude oil discharge pipeline 21 is also conveyed to the mixer 31 from the crude oil discharge pipeline 21, and the casing gas and the crude oil are converged in the mixer 31 and then enter the oil conveying pipeline through the recovery pipeline 33 and are conveyed backwards, so that the recycling of the casing gas is realized.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.