Venting device and gas injection system

Abstract

The present invention provides a venting device and a gas injection system, wherein the venting device comprises: a first pipeline, a first throttle valve, a first pressure detection device, a first exhaust pipe and a second exhaust pipe; the outlet of the first throttle valve is connected to the inlet of the first pipeline; the first pressure detection device is arranged on the first pipeline; the outlet of the first pipeline is connected to the inlet of the first exhaust pipe and the second exhaust pipe, the first exhaust pipe is provided with a first valve; the second exhaust pipe is provided with a second valve. When the compressor is overhauled, part of the natural gas remaining in the compressor can be firstly recovered to the gas supply system for compressed gas supply through the first exhaust pipe, and then the remaining natural gas is released through the venting torch. Compared with releasing all the remaining natural gas in the compressor through the venting torch, part of the natural gas is recovered, thereby reducing the waste of natural gas.

Description

Technical Field

[0001] The invention relates to a petroleum production equipment technology, and in particular to a venting device and a gas injection system. Background Art

[0002] Oil is generally stored in underground reservoirs. The distance between the oil reservoir and the ground is relatively large. Therefore, a well pipe extending to the oil reservoir is often set on the ground, a casing is passed through the well pipe, and an oil pipe is set inside the casing. The bottom ends of the oil pipe and the casing both extend to the oil reservoir and are connected to the oil reservoir. During exploitation, the oil in the oil reservoir is extracted through the oil pipe. However, the distance between the oil reservoir and the ground is relatively large, making it difficult to extract the oil.

[0003] In the prior art, natural gas is often injected into the oil reservoir through a gas injection system. Driven by the natural gas, the oil in the oil reservoir is driven to flow to the ground along the oil pipe, and the difficulty of mining is reduced. Specifically, the gas injection system includes: a compressor, a gas injection pipeline, a venting pipeline, a venting valve and a control valve. The outlet of the compressor is connected to the casing through the gas injection pipeline, and the control valve is arranged on the gas injection pipeline. The outlet of the compressor is also connected to the venting torch through the venting pipeline, and the venting valve is arranged on the venting pipeline. During gas injection, the venting valve is closed, the control valve is opened, and the compressor transports the natural gas between the casing and the oil pipe through the gas injection pipeline, and then transports it to the oil reservoir. When the compressor needs to be repaired, the compressor and the main control valve are closed, and the venting valve is opened, and the natural gas in the compressor is transported to the venting torch through the venting pipeline, and after being burned by the venting torch, it is discharged into the atmosphere.

[0004] However, when the compressor is overhauled, all the natural gas in the compressor is discharged to the flare, resulting in energy waste. Summary of the invention

[0005] The embodiment of the present invention provides a venting device and a gas injection system to solve the technical problem of energy waste caused by discharging all the natural gas in the compressor to the venting flare when the compressor is overhauled.

[0006] An embodiment of the present invention provides a venting device, comprising: a first pipeline, a first throttle valve, a first pressure detection device, a first exhaust pipe and a second exhaust pipe; the inlet of the first throttle valve is used to communicate with the outlet of a compressor, and the outlet of the first throttle valve is connected to the inlet of the first pipeline; the first pressure detection device is arranged on the first pipeline to detect the air pressure in the first pipeline; the outlet of the first pipeline is connected to the inlets of the first exhaust pipe and the second exhaust pipe, the outlet of the first exhaust pipe is used to communicate with the inlet of the compressor, and the first exhaust pipe is provided with a first valve; the outlet of the second exhaust pipe is used to communicate with the venting flare, and the second exhaust pipe is provided with a second valve.

[0007] As described above, the venting device preferably further includes a third exhaust pipe and a third valve; the inlet of the third exhaust pipe is connected to the outlet of the first pipeline, the outlet of the third exhaust pipe is used to communicate with the fuel pipe, and the third valve is arranged on the third exhaust pipe.

[0008] As described above, the venting device is preferably provided with a first one-way valve on the first exhaust pipe between the first valve and the compressor inlet, and the first one-way valve only allows gas to flow toward the compressor inlet; and a third one-way valve is provided on the third exhaust pipe between the third valve and the fuel pipe inlet, and the third one-way valve only allows gas to flow toward the fuel pipe inlet.

[0009] The venting device as described above, preferably, further comprises: a flow meter, a first maintenance valve and a second maintenance valve; the first maintenance valve and the second maintenance valve are both arranged on the first pipeline and are arranged at intervals along the extension direction of the first pipeline; the flow meter is arranged on the first pipeline and is located between the first maintenance valve and the second maintenance valve, and the flow meter is used to detect the flow of gas in the first pipeline.

[0010] As described above, the venting device preferably further comprises an exhaust valve, an inlet of the exhaust valve is communicated with the first pipeline between the first maintenance valve and the second maintenance valve, and an outlet of the exhaust valve is used to communicate with the atmosphere.

[0011] The venting device as described above, preferably, further comprises a temperature detection device, wherein the temperature detection device is disposed on the first pipeline and is used to detect the temperature of the gas in the first pipeline.

[0012] As described above, the venting device preferably further comprises a safety valve, the inlet of the safety valve is communicated with the inlet of the first exhaust pipe, and the outlet of the safety valve is used to communicate with the atmosphere.

[0013] As described above, the venting device preferably further includes a fourth valve and a fifth valve; the inlet of the safety valve is connected to the inlet of the first exhaust pipe through the fourth valve, and the inlet of the safety valve is also connected to the outlet of the second valve through the fifth valve.

[0014] The venting device as described above, preferably, further comprises: a second throttle valve, a second pipeline and a second pressure detecting device; the inlet of the second throttle valve is used to communicate with the outlet of the compressor, the outlet of the second throttle valve is communicated with the inlet of the second pipeline, the outlet of the second pipeline is communicated with the inlets of the first exhaust pipe and the second exhaust pipe; the second pressure detecting device is arranged on the second pipeline to detect the air pressure in the second pipeline.

[0015] An embodiment of the present invention also provides a gas injection system, comprising: a compressor, a gas injection pipeline and the venting device as described above, wherein the outlet of the compressor is connected to the annulus through the gas injection pipeline, and the outlet of the compressor is also connected to the inlet of the first throttle valve in the venting device.

[0016] The venting device and gas injection system provided in the embodiment of the present invention connect the inlet of the first throttle valve with the outlet of the compressor, the outlet of the first throttle valve with the inlet of the first pipeline, the outlet of the first pipeline with the inlets of the first exhaust pipe and the second exhaust pipe, a first valve is arranged on the first exhaust pipe, and a second valve is arranged on the second exhaust pipe; the outlet of the first exhaust pipe is connected with the inlet of the compressor, and the outlet of the second exhaust pipe is connected with the venting torch; when the compressor is overhauled, part of the natural gas remaining in the compressor can be first recovered into the gas supply system for compressed gas supply through the first exhaust pipe, and then the remaining natural gas can be released through the venting torch. Compared with releasing all the residual natural gas in the compressor through the venting torch, part of the natural gas is recovered, thereby reducing the waste of natural gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 1 ;

[0019] Figure 2 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 2 ;

[0020] Figure 3 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 3 ;

[0021] Figure 4 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 4 ;

[0022] Figure 5 A schematic diagram of the connection between the venting device and the compressor provided in an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 10: First pipeline;

[0025] 101: first throttle valve;

[0026] 102: a first pressure detection device;

[0027] 103: flow meter;

[0028] 104: first maintenance valve;

[0029] 105: second maintenance valve;

[0030] 106: Exhaust valve;

[0031] 107: temperature detection device;

[0032] 20: first exhaust pipe;

[0033] 201: First valve;

[0034] 202: first one-way valve;

[0035] 30: second exhaust pipe;

[0036] 301: second valve;

[0037] 302: vent the torch;

[0038] 40: third exhaust pipe;

[0039] 401: The third valve;

[0040] 402: third one-way valve;

[0041] 403: fuel pipe;

[0042] 50: Safety valve;

[0043] 501: the fourth valve;

[0044] 502: The fifth valve;

[0045] 60: Second pipeline;

[0046] 601: second throttle valve;

[0047] 602: second pressure detection device;

[0048] 70: compressor;

[0049] 701: gas injection pipeline;

[0050] 702: Gas injection valve;

[0051] 80: Third pipeline;

[0052] 801: The sixth valve;

[0053] 90: Ring space. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0055] In the present invention, unless otherwise clearly defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral molding, it can be a mechanical connection, it can be an electrical connection, or it can communicate with each other; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] Figure 1 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 2 ; Figure 3 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 3 ; Figure 4 A schematic diagram of the structure of the venting device provided in the embodiment of the present invention Figure 4 ; Figure 5 A schematic diagram of the connection between the venting device and the compressor provided in an embodiment of the present invention.

[0057] Please refer to Figure 1-Figure 5The present embodiment provides a venting device, comprising: a first pipeline 10, a first throttle valve 101, a first pressure detection device 102, a first exhaust pipe 20 and a second exhaust pipe 30; the inlet of the first throttle valve 101 is used to communicate with the outlet of the compressor 70, and the outlet of the first throttle valve 101 is communicated with the inlet of the first pipeline 10; the first pressure detection device 102 is arranged on the first pipeline 10 to detect the air pressure in the first pipeline 10; the outlet of the first pipeline 10 is communicated with the inlet of the first exhaust pipe 20 and the second exhaust pipe 30, the outlet of the first exhaust pipe 20 is used to communicate with the inlet of the compressor 70, and the first exhaust pipe 20 is provided with a first valve 201; the outlet of the second exhaust pipe 30 is used to communicate with the venting flare 302, and the second exhaust pipe 30 is provided with a second valve 301.

[0058] In this embodiment, the first throttle valve 101 is used to throttle and reduce the pressure of the gas flowing from the outlet of the compressor 70 to the first exhaust pipe 20 and the second exhaust pipe 30, so as to reduce the pressure of the gas flowing into the first exhaust pipe 20 or the second exhaust pipe 30. Specifically, by adjusting the first throttle valve 101, the outlet pressure of the first throttle valve 101 can be controlled; illustratively, the first throttle valve 101 can be an angle throttle valve, which can include a valve body and a valve stem, a throttle channel is provided on the valve body, one end of the throttle channel is connected to the outlet of the compressor 70, and the other end of the throttle channel is connected to the inlet of the first exhaust pipe 20 and the second exhaust pipe 30, the valve body is also provided with a threaded hole penetrating the throttle channel, and the valve stem is provided with an external thread matching the threaded hole, and twisting the valve stem can make the valve stem enter the throttle channel or move to the outside of the throttle channel, thereby adjusting the cross-sectional area of ​​the throttle channel to change the outlet pressure of the first throttle valve 101. Of course, the first throttle valve 101 in the present embodiment may also have other structures, as long as the first throttle valve 101 can adjust the pressure of the gas entering the first pipeline 10 and the second pipeline 60 .

[0059] The compressor 70 in this embodiment is used to inject natural gas into the annulus 90 between the oil pipe and the casing. The outlet of the compressor 70 is also connected to the annulus 90 between the oil pipe and the casing through the gas injection pipeline 701. The gas injection pipeline 701 is provided with a gas injection valve 702, and the gas injection valve 702 is used to control the opening and closing of the gas injection pipeline 701. The compressor 70 in this embodiment can be a multi-stage compressor 70, so as to inject high-pressure gas into the annulus 90 between the oil pipe and the casing. The gas flows into the oil reservoir through the annulus 90 between the oil pipe and the casing to drive the oil to flow out through the oil pipe.

[0060] In this embodiment, the first valve 201 provided on the first exhaust pipe 20 is used to control the on-off of the first exhaust pipe 20. Similarly, the second valve 301 provided on the second exhaust pipe 30 is used to control the on-off of the second exhaust pipe 30. Preferably, the second valve 301 may be a cut-off vent valve, which may throttle and reduce the pressure of the natural gas flowing to the venting flare 302, so as to prevent the natural gas flowing into the venting flare 302 from having an excessively high pressure.

[0061] In this embodiment, the outlet of the second exhaust pipe 30 is connected to the venting flare 302; wherein the venting flare 302 is used to ignite the natural gas so that it burns in the atmosphere to achieve the discharge of the natural gas. The outlet of the first exhaust pipe 20 is connected to the inlet of the compressor 70, and the outlet of the first exhaust pipe 20 can be connected to the gas supply system for supplying gas to the compressor 70, so as to recover the natural gas remaining in the compressor 70 to the gas supply system.

[0062] In this embodiment, the first pressure detection device 102 disposed on the first pipeline 10 can be of various types, as long as it can detect the natural gas pressure in the first pipeline 10. For example, the first pressure detection device 102 can be a pressure gauge disposed on the first pipeline 10, and the natural gas pressure in the first pipeline 10 can be directly obtained through the pressure gauge. Of course, the first pressure detection device 102 can also include an air pressure sensor, which can convert the air pressure signal in the first pipeline 10 into an electrical signal. The control device such as a single-chip microcomputer, a programmable logic controller, etc. connected to the air pressure sensor processes the electrical signal to obtain the natural gas pressure in the first pipeline 10.

[0063] The use process of the venting device provided in this embodiment is as follows: when the compressor 70 is working normally, the first throttle valve 101 is closed, and the compressor 70 injects natural gas into the oil reservoir through the gas injection pipeline 701; of course, when the compressor 70 needs to be repaired, the compressor 70 and the gas injection valve 702 on the gas injection pipeline 701 are closed; then the first throttle valve 101 is slowly opened, and the gas pressure in the first pipeline 10 is obtained through the first pressure detection device 102. When the gas pressure in the first pipeline 10 is slightly higher than the inlet pressure of the compressor 70, the first valve 201 is opened, and the natural gas enters the inlet of the compressor 70 through the first exhaust pipe 20 to realize the recovery of natural gas; when the gas pressure in the first pipeline 10 is equal to the inlet pressure of the compressor 70, the first valve 201 is closed, and the second valve 301 is opened to allow the natural gas to flow into the venting torch 302 through the second exhaust pipe 30, so that the remaining natural gas is released by combustion. After the residual natural gas in the compressor 70 is completely released, the compressor 70 can be repaired.

[0064] The venting device provided in this embodiment communicates the inlet of the first throttle valve 101 with the outlet of the compressor 70, the outlet of the first throttle valve 101 with the inlet of the first pipeline 10, the outlet of the first pipeline 10 with the inlets of the first exhaust pipe 20 and the second exhaust pipe 30, a first valve 201 is arranged on the first exhaust pipe 20, and a second valve 301 is arranged on the second exhaust pipe 30; the outlet of the first exhaust pipe 20 is communicated with the inlet of the compressor 70, and the outlet of the second exhaust pipe 30 is communicated with the venting flare 302; when the compressor 70 is overhauled, part of the natural gas remaining in the compressor 70 can be first recovered into the gas supply system for compressed gas supply through the first exhaust pipe 20, and then the remaining natural gas can be released through the venting flare 302. Compared with releasing all the residual natural gas in the compressor 70 through the venting flare 302, part of the natural gas is recovered, thereby reducing the waste of natural gas.

[0065] In this embodiment, the venting device further includes a third exhaust pipe 40 and a third valve 401; the inlet of the third exhaust pipe 40 is connected to the outlet of the first pipeline 10, the outlet of the third exhaust pipe 40 is used to communicate with the fuel pipe 403, and the third valve 401 is arranged on the third exhaust pipe 40. The fuel pipe 403 can be a pipeline for providing gas to the plant area such as the joint station, or a civil natural gas pipeline, etc.; and the gas pressure in the fuel pipe 403 is lower than the inlet pressure of the compressor 70, and higher than the gas pressure of the venting torch 302. In this way, after part of the natural gas remaining in the compressor 70 is recovered to the gas supply system through the first exhaust pipe 20, part of the natural gas in the compressor 70 is transported to the fuel pipe 403 through the third pipeline 80 to further recover the natural gas remaining in the compressor 70; when the pressure of the first pressure detection device 102 is equal to the gas pressure in the fuel pipe 403, the third valve 401 is closed, the second valve 301 is opened, and the remaining natural gas is released through the venting torch 302.

[0066] In this embodiment, a first check valve 202 is provided on the first exhaust pipe 20 between the first valve 201 and the inlet of the compressor 70, and the first check valve 202 only allows gas to flow to the inlet of the compressor 70; a third check valve 402 is provided on the third exhaust pipe 40 between the third valve 401 and the inlet of the fuel pipe 403, and the third check valve 402 only allows gas to flow to the inlet of the fuel pipe 403. Such an arrangement can prevent natural gas from flowing back into the compressor 70. Specifically, the first check valve 202 can prevent the natural gas in the gas supply system from entering the compressor 70, and the third check valve 402 can prevent the natural gas in the fuel pipe 403 from entering the compressor 70.

[0067] In this embodiment, the venting device further includes: a flow meter 103, a first maintenance valve 104 and a second maintenance valve 105; the first maintenance valve 104 and the second maintenance valve 105 are both arranged on the first pipeline 10 and are arranged at intervals along the extension direction of the first pipeline 10; the flow meter 103 is arranged on the first pipeline 10 and is located between the first maintenance valve 104 and the second maintenance valve 105, and the flow meter 103 is used to detect the flow of gas in the first pipeline 10. The flow meter 103 can be used to obtain the gas flow flowing through the first pipeline 10, so as to obtain the volume of natural gas.

[0068] The first maintenance valve 104 and the second maintenance valve 105 are used to cut off the gas source at both ends of the flow meter 103 when the flow meter 103 is being repaired to prevent natural gas leakage.

[0069] Furthermore, the venting device provided in this example further includes an exhaust valve 106, the inlet of the exhaust valve 106 is connected to the first pipeline 10 between the first maintenance valve 104 and the second maintenance valve 105, and the outlet of the exhaust valve 106 is used to communicate with the atmosphere. When the flow meter 103 is inspected and repaired, the natural gas in the first pipeline 10 between the first maintenance valve 104 and the second maintenance valve 105 can be released through the exhaust valve 106.

[0070] Specifically, when the flow meter 103 is inspected, the first maintenance valve 104 and the second maintenance valve 105 are first closed, and then the exhaust valve 106 is opened to discharge the natural gas in the first pipeline 10 between the first maintenance valve 104 and the second maintenance valve 105, and then the flow meter 103 can be inspected.

[0071] In this embodiment, the venting device further includes a temperature detection device 107, which is disposed on the first pipeline 10 and is used to detect the temperature of the gas in the first pipeline 10. The temperature of the natural gas in the first pipeline 10 can be detected by the temperature detection device 107 to prevent the temperature of the natural gas from being too high and affecting the operation of subsequent equipment.

[0072] Specifically, the temperature detection device 107 may include a temperature sensor, which converts the temperature signal of the natural gas into an electrical signal, and the control device obtains the electrical signal to detect the temperature. Of course, the temperature detection device 107 may also be a device capable of detecting temperature, such as a thermometer.

[0073] In this embodiment, the venting device further includes a safety valve 50, the inlet of the safety valve 50 is connected to the inlet of the first exhaust pipe 20, and the outlet of the safety valve 50 is used to communicate with the atmosphere. The natural gas in the first pipeline 10 can be directly discharged into the atmosphere through the safety valve 50.

[0074] In this embodiment, the safety valve 50 may be a relief valve, so that when the gas pressure in the first pipeline 10 is higher than a preset value, the relief valve automatically opens to discharge the gas in the first pipeline 10 to the atmosphere, and when the gas pressure in the first pipeline 10 is lower than the preset pressure value, the relief valve automatically closes. Of course, the safety valve 50 may also be a ball valve, a gate valve, etc.

[0075] Specifically, the venting device further includes a fourth valve 501 and a fifth valve 502; the inlet of the safety valve 50 is connected to the inlet of the first exhaust pipe 20 through the fourth valve 501, and the inlet of the safety valve 50 is also connected to the outlet of the second valve 301 through the fifth valve 502. The fourth valve 501 can prevent the first pipeline 10 from supplying gas to the safety valve 50, thereby facilitating the maintenance of the safety valve 50; in addition, the natural gas in the venting flare 302 can also be released into the atmosphere through the fifth valve 502 and the safety valve 50.

[0076] The working process of the venting device provided in this embodiment is as follows: when the compressor 70 is working normally, the first throttle valve 101 is closed, and the compressor 70 injects natural gas into the oil reservoir through the gas injection pipeline 701; when the compressor 70 needs to be repaired, the compressor 70 and the gas injection valve 702 on the gas injection pipeline 701 are closed; then the first throttle valve 101 is slowly opened, and the gas pressure in the first pipeline 10 is obtained through the first pressure detection device 102. When the gas pressure in the first pipeline 10 is slightly higher than the inlet pressure of the compressor 70, the first valve 201 is opened, and the natural gas enters the inlet of the compressor 70 through the first exhaust pipe 20, so as to realize the recovery of natural gas; When the gas pressure in the first pipeline 10 is equal to the inlet pressure of the compressor 70, the first valve 201 is closed and the third valve 401 is opened, so that the natural gas in the compressor 70 flows into the fuel pipe 403 through the third pipeline 80, so as to further recover the natural gas in the compressor 70; when the natural gas pressure in the first pipeline 10 is reduced to be equal to the gas pressure in the fuel pipe 403, the third valve 401 is closed and the second valve 301 is opened, so that the natural gas flows into the venting torch 302 through the second exhaust pipe 30, and the remaining natural gas is released by combustion. After the residual natural gas in the compressor 70 is completely released, the compressor 70 can be repaired.

[0077] In this embodiment, the venting device further includes: a second throttle valve 601, a second pipeline 60 and a second pressure detection device 602; the inlet of the second throttle valve 601 is used to communicate with the outlet of the compressor 70, the outlet of the second throttle valve 601 is communicated with the inlet of the second pipeline 60, and the outlet of the second pipeline 60 is communicated with the inlet of the first exhaust pipe 20 and the inlet of the second exhaust pipe 30; the second pressure detection device 602 is arranged on the second pipeline 60 to detect the gas pressure in the second pipeline 60. When the first throttle valve 101 or the first pipeline 10 or each device on the first pipeline 10 fails, the first throttle valve 101 or the first maintenance valve 104 and the second maintenance valve 105 can be closed to prevent the natural gas from flowing in the first pipeline 10; at this time, the natural gas is transported to the first exhaust pipe 20, the second exhaust pipe 30 and the third exhaust pipe 40 through the second throttle valve 601 and the second pipeline 60 to prevent the venting device from stopping working.

[0078] Specifically, the second throttle valve 601 may be the same as the first throttle valve 101 , and the second pressure detection device 602 may be the same as the first pressure detection device 102 .

[0079] Preferably, a temperature detection device 107, a flow meter 103, a first maintenance valve 104 and a second maintenance valve 105 may also be provided on the second pipeline 60. The specific installation positions and connection methods are substantially the same as those of the first pipeline 10 and will not be described in detail herein.

[0080] In this embodiment, a third pipeline 80 is arranged between the gas injection pipeline 701 between the gas injection valve 702 and the annulus 90 and the inlets of the first throttle valve 101 and the second throttle valve 601. A sixth valve 801 is arranged on the third pipeline 80 so that when it is necessary to release the natural gas in the annulus 90 between the oil pipe and the casing, the sixth valve 801 is opened to recover and discharge the natural gas.

[0081] It is worth noting that, in this embodiment, the first valve 201, the second valve 301, the third valve 401, the fourth valve 501, the fifth valve 502, the sixth valve 801, the first maintenance valve 104, the second maintenance valve 105 and the gas injection valve can be ball valves, gate valves and other valves that can control the on-off of the pipelines where the valves are located.

[0082] Continue to refer to Figure 1-Figure 5 In other embodiments, a gas injection system is provided, comprising: a compressor 70, a gas injection pipeline 701, and the venting device as described above, wherein the outlet of the compressor 70 is connected to the annulus 90 through the gas injection pipeline 701, and the outlet of the compressor 70 is also connected to the inlet of the first throttle valve 101 in the venting device.

[0083] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0084] It should be noted that in the description of the present invention, the terms "first" and "second" are only used to facilitate the description of different components, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0085] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A venting device, characterized in that: include: a first pipeline, a first throttle valve, a first pressure detection device, a first exhaust pipe, a second exhaust pipe, a third exhaust pipe, a temperature detection device and a safety valve; the inlet of the first throttle valve is used to communicate with the outlet of the compressor, and the outlet of the first throttle valve is communicated with the inlet of the first pipeline; the first pressure detection device is arranged on the first pipeline to detect the air pressure in the first pipeline; the temperature detection device is arranged on the first pipeline to detect the temperature of the gas in the first pipeline; the inlet of the safety valve is communicated with the inlet of the first exhaust pipe, and the outlet of the safety valve is communicated with the atmosphere; The outlet of the first pipeline is communicated with the inlets of the first exhaust pipe, the second exhaust pipe and the third exhaust pipe. The outlet of the first exhaust pipe is used to communicate with the inlet of the compressor, and the first exhaust pipe is provided with a first valve; the outlet of the second exhaust pipe is used to communicate with the venting torch, and the second exhaust pipe is provided with a second valve; the outlet of the third exhaust pipe is used to communicate with the fuel pipe, and the third valve is provided on the third exhaust pipe; When the first pressure detection device detects that the gas pressure in the first pipeline is higher than the inlet pressure of the compressor, the first valve opens; when the first pressure detection device detects that the gas pressure in the first pipeline is equal to the inlet pressure of the compressor, the first valve is closed and the third valve is opened; when the first pressure detection device detects that the natural gas pressure in the first pipeline is equal to the gas pressure in the fuel pipe, the third valve is closed and the second valve is opened.

2. The venting device according to claim 1, characterized in that: A first one-way valve is arranged on the first exhaust pipe between the first valve and the compressor inlet, and the first one-way valve only allows gas to flow toward the compressor inlet; a third one-way valve is arranged on the third exhaust pipe between the third valve and the fuel pipe inlet, and the third one-way valve only allows gas to flow toward the fuel pipe inlet.

3. The venting device according to claim 1, characterized in that: The venting device further comprises: a flow meter, a first maintenance valve and a second maintenance valve; The first maintenance valve and the second maintenance valve are both arranged on the first pipeline and are arranged at intervals along the extension direction of the first pipeline; the flow meter is arranged on the first pipeline and is located between the first maintenance valve and the second maintenance valve, and the flow meter is used to detect the flow of gas in the first pipeline.

4. The venting device according to claim 3, characterized in that: The venting device further comprises an exhaust valve, an inlet of the exhaust valve is communicated with a first pipeline between the first maintenance valve and the second maintenance valve, and an outlet of the exhaust valve is used to communicate with the atmosphere.

5. The venting device according to claim 1, characterized in that: The venting device also includes a fourth valve and a fifth valve; the inlet of the safety valve is connected to the inlet of the first exhaust pipe through the fourth valve, and the inlet of the safety valve is also connected to the outlet of the second valve through the fifth valve.

6. The venting device according to claim 1, characterized in that: The venting device also includes: a second throttle valve, a second pipeline and a second pressure detection device; the inlet of the second throttle valve is used to communicate with the outlet of the compressor, the outlet of the second throttle valve is communicated with the inlet of the second pipeline, and the outlet of the second pipeline is communicated with the inlets of the first exhaust pipe and the second exhaust pipe; the second pressure detection device is arranged on the second pipeline to detect the air pressure in the second pipeline.

7. A gas injection system, characterized in that: include: A compressor, an air injection pipeline, and a venting device as described in any one of claims 1 to 6, wherein the outlet of the compressor is connected to the annulus through the air injection pipeline, and the outlet of the compressor is also connected to the inlet of the first throttle valve in the venting device.

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