Oil and gas mixed transmission method and device

Abstract

The present application provides an oil and gas mixed transportation method and device, including a triangular rotor compressor, a driving mechanism and an oil feeding pump, the triangular rotor compressor including a triangular rotor, a first feed port, a second feed port and a discharge port, the first feed port is connected to the associated gas pipeline of the oil well, the second feed port is connected to the output end of the oil feeding pump through a pipeline, the input end of the oil feeding pump is connected to the produced liquid pipeline of the oil well, the discharge port is connected to the external oil pipeline of the oil well, and the driving mechanism is transmission-connected to the central axis of the triangular rotor to drive the triangular rotor to rotate.

Description

Technical Field

[0001] The present application relates to the field of oil and natural gas development, and in particular to an oil and gas mixed transportation method and device. Background Art

[0002] With the resourceization of associated petroleum gas and the increasingly stringent environmental protection situation of oil and gas extraction, the low-pressure and small amount of wellhead associated gas that was previously ignored is no longer allowed to be vented and burned in an extensive manner. This has also promoted the development of oil and gas mixed transportation technology in my country, among which the oil and gas mixed transportation pump is a key equipment, which is required to have the performance of both a pump and a compressor. However, the existing equipment such as screw pumps, synchronous rotary gas-liquid mixed transportation pumps and swing rotor gas-liquid mixed transportation pumps cannot take both into account.

[0003] The produced fluid lifted from each oil well to the ground needs to be collected at the gathering station to complete the processes of metering, heating and transfer. During this process, the associated gas in the produced fluid will be separated from the crude oil, resulting in a waste of resources. Therefore, before continuing to transfer to the downstream transfer station or centralized processing station, how to ensure the mixed transportation of oil and gas has become an urgent problem to be solved. Summary of the invention

[0004] The purpose of the present application is to overcome the defects of the prior art and provide a method and device for mixed oil and gas transportation.

[0005] To achieve the above objectives, this application adopts the following technical solutions:

[0006] An oil and gas mixed transmission method, wherein associated gas from an oil well enters a first chamber of a triangular rotor compressor through a first feed port of the triangular rotor compressor, and a central axis of the triangular rotor compressor drives a triangular rotor of the triangular rotor compressor to rotate eccentrically, and a volume of the first chamber gradually increases during the rotation of the triangular rotor, thereby forming an associated gas suction process;

[0007] The associated gas in the first chamber moves together with the first chamber toward the second feed port of the triangular rotor compressor, and the volume of the first chamber gradually decreases so that the associated gas is compressed, forming a gas compression process;

[0008] The first chamber is transformed into the second chamber of the triangular rotor compressor, and the oil from the oil well enters the second chamber through the second feed inlet to form a liquid inlet process;

[0009] The second chamber moves toward the discharge port of the triangular rotor compressor and gradually expands, and the associated gas and petroleum are mixed in the second chamber to form an oil-gas mixture, forming an oil-gas mixing process;

[0010] The oil-gas mixture is discharged through the discharge port. During the discharge, the triangular rotor provides discharge pressure under the action of the driving mechanism, thereby forming a pressurized discharge process.

[0011] Optionally, the outer gear ring of the central shaft meshes with the inner gear ring of the triangular rotor, and the central shaft is drivingly connected to a driving mechanism to drive the triangular rotor to move.

[0012] The present application also provides an oil-gas mixed transmission device, including a triangular rotor compressor, a driving mechanism and an oil feeding pump, the triangular rotor compressor including a triangular rotor, a first feed port, a second feed port and a discharge port, the first feed port is connected to the associated gas pipeline of the oil well so that the associated gas from the oil well enters the triangular rotor compressor through the first feed port, the second feed port is connected to the output end of the oil feeding pump through a pipeline, the input end of the oil feeding pump is connected to the produced liquid pipeline of the oil well, the oil from the oil well is transported to the triangular rotor compressor through the produced liquid pipeline and the oil feeding pump to be mixed with the associated gas to obtain an oil-gas mixture, the discharge port is connected to the external oil pipeline of the oil well so that the oil-gas mixture is mixed and transmitted, and the driving mechanism is transmission-connected to the central axis of the triangular rotor so as to drive the triangular rotor to rotate.

[0013] Optionally, the oil-gas mixed transmission device also includes a stop valve and a first ball valve, wherein both ends of the stop valve are respectively connected to the second feed port and the output end of the oil feeding pump through pipelines, and both ends of the first ball valve are respectively connected to the produced liquid pipeline and the input end of the oil feeding pump.

[0014] Optionally, the oil and gas mixed transmission device also includes a flow meter and a second ball valve, one end of the flow meter is connected to the first feed port through a pipeline, the other end of the flow meter is connected to one end of the second ball valve through a pipeline, and the other end of the second ball valve is connected to the associated gas pipeline.

[0015] Optionally, the oil-gas mixed transmission device also includes a one-way valve and a third ball valve, one end of the one-way valve is connected to the external oil pipeline, the other end of the one-way valve is connected to one end of the third ball valve through a pipeline, and the other end of the third ball valve is connected to the discharge port through a pipeline.

[0016] Optionally, the driving mechanism is an electric motor, a diesel engine or a gasoline engine.

[0017] Optionally, the triangular rotor compressor includes a cylinder body, a central shaft is arranged in the cylinder body, the triangular rotor is rotatably mounted on the central shaft, the central shaft is connected to the driving mechanism to drive the triangular rotor to rotate in the cylinder body, the first feed port and the discharge port are arranged on one side of the cylinder body, and the second feed port is arranged on the other side of the cylinder body.

[0018] Optionally, the triangular rotor rotates eccentrically in the cylinder body about the central axis, thereby forming a first chamber, a second chamber, and a third chamber inside the cylinder body, the first chamber being arranged corresponding to the first feed port, the second chamber being arranged corresponding to the second feed port, and the third chamber being arranged corresponding to the discharge port.

[0019] Optionally, the triangular rotor includes a rotor body, and curved surfaces linearly fitting with the inner wall of the cylinder body are respectively arranged on the three side walls of the rotor body, so that the rotor body linearly fits with the inner wall of the cylinder body during rotation, and pit portions are respectively arranged on the three side walls of the rotor body, and the pit portions and the cylinder body together form a space of three chambers.

[0020] Optionally, an outer gear ring is provided on the outer wall of the central shaft, and an inner gear ring is provided on the inner wall of the central hole, and the outer gear ring and the inner gear ring are meshed with each other when the triangular rotor rotates.

[0021] Optionally, the ratio of the number of teeth of the inner gear ring to that of the outer gear ring is 3:2, and the cylinder body of the triangular rotor compressor is an "8"-shaped structure.

[0022] The oil and gas mixed transportation method and device of the present application are provided with a triangular rotor compressor with a driving mechanism as a power source, and the associated gas and petroleum of the oil well are mixed in the triangular rotor compressor to obtain an oil and gas mixture, and then the oil and gas are mixed and transported through a discharge port and an external oil pipeline. The triangular rotor compressor of the present application has the performance of both a pump and a compressor. The triangular rotor compressor can be used to efficiently and reliably realize the mixed transportation of associated gas and petroleum, thereby avoiding the waste of resources caused by the separation of associated gas and crude oil in the oil well produced fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a process flow chart of the oil and gas mixed transmission device of an embodiment of the present application;

[0024] Figure 2 is a structural schematic diagram of the suction process of the triangular rotor compressor of an embodiment of the present application;

[0025] Figure 3 is a structural schematic diagram of the gas compression process of the triangular rotor compressor of an embodiment of the present application;

[0026] Figure 4 is a structural schematic diagram of the liquid intake process of the triangular rotor compressor of an embodiment of the present application;

[0027] Figure 5 is a structural schematic diagram of the oil-gas mixing process of the triangular rotor compressor of an embodiment of the present application;

[0028] Figure 6 It is a structural schematic diagram of the boosting and discharge process of the triangular rotor compressor in an embodiment of the present application.

[0029] Reference numerals

[0030] 1-cylinder body, 2-triangular rotor, 3-center axis, 4-first feed port, 5-second feed port, 6-discharge port, 7-first chamber, 8-second chamber, 9-third chamber, 10-triangular rotor compressor, 11-stop valve, 12-flow meter, 13-oil feeding pump, 14-driving mechanism, 15-external oil pipeline, 16-associated gas pipeline, 17-produced liquid pipeline, 181-first ball valve, 182-second ball valve, 183-third ball valve, 19-check valve, 21-rotor body, 22-center hole, 23-pit part, 24-inner gear ring, 31-outer gear ring. DETAILED DESCRIPTION

[0031] The specific implementation of the present application is described below in conjunction with the accompanying drawings.

[0032] In this document, “upper”, “lower”, “front”, “back”, “left”, “right”, etc. are only used to indicate the relative position relationship between related parts, rather than to limit the absolute positions of these related parts.

[0033] In this article, "first", "second", etc. are only used to distinguish each other, and do not indicate the importance and order, or the premise of each other's existence.

[0034] In this document, “equal”, “same”, etc. are not strictly limited in a mathematical and / or geometric sense, but also include errors that can be understood by those skilled in the art and are allowed in manufacturing or use.

[0035] Unless otherwise stated, the numerical ranges herein include not only the entire range within its two endpoints but also include several sub-ranges contained therein.

[0036] The present application provides an oil-gas mixed transmission device, such as Figure 1 and Figure 2As shown, the triangular rotor compressor 10 includes a triangular rotor 2, a first feed port 4, a second feed port 5 and a discharge port 6. The first feed port 4 is connected to the associated gas pipeline 16 of the oil well so that the associated gas from the oil well enters the triangular rotor compressor 10 through the first feed port 4. The main components of the associated gas include dry gas mainly composed of methane and ethane, liquefied petroleum gas and stable light hydrocarbons. The second feed port 5 is connected to the associated gas pipeline 16 of the oil well so that the associated gas from the oil well enters the triangular rotor compressor 10 through the first feed port 4. The pipeline is connected to the output end of the oil feeding pump 13, and the input end of the oil feeding pump 13 is connected to the produced liquid pipeline 17 of the oil well. The oil from the oil well is transported to the triangular rotor compressor 10 through the produced liquid pipeline 17 and the oil feeding pump 13 to be mixed with the associated gas to obtain an oil-gas mixture. The discharge port 6 is connected to the external oil pipeline 15 of the oil well to transport the oil-gas mixture. The driving mechanism 14 is connected to the central axis 3 of the triangular rotor 2 to drive the triangular rotor 2 to rotate.

[0037] Optionally, the driving mechanism 14 may be an electric motor, a diesel engine or a gasoline engine.

[0038] The oil and gas mixed transportation device of the present application is provided with a triangular rotor compressor 10 with a driving mechanism 14 as a power source, and the associated gas and petroleum of the oil well are mixed in the triangular rotor compressor 10 to obtain an oil and gas mixture, and then the oil and gas are mixed and transported through the discharge port 6 and the external oil pipeline 15. The triangular rotor compressor 10 of the present application has the performance of both a pump and a compressor. The triangular rotor compressor 10 can be used to efficiently and reliably realize the mixed transportation of associated gas and petroleum, thereby avoiding the waste of resources caused by the separation of associated gas and crude oil in the oil well produced fluid.

[0039] In one embodiment of the present application, Figure 1 As shown, the oil-gas mixed transmission device also includes a stop valve 11 and a first ball valve 181. The two ends of the stop valve 11 are respectively connected to the second feed port 5 and the output end of the oil feeding pump 13 through pipelines for controlling the cutoff of the pipeline. The two ends of the first ball valve 181 are respectively connected to the produced liquid pipeline 17 and the input end of the oil feeding pump 13.

[0040] In another embodiment of the present application, Figure 1 As shown, the oil-gas mixed transmission device also includes a flow meter 12 and a second ball valve 182, one end of the flow meter 12 is connected to the first feed port 4 through a pipeline, the other end of the flow meter 12 is connected to one end of the second ball valve 182 through a pipeline, and the other end of the second ball valve 182 is connected to the associated gas pipeline 16, and the associated gas from the oil well passes through the second ball valve 182 and the flow meter 12 for flow monitoring in sequence and enters the triangular rotor compressor 10.

[0041] In another embodiment of the present application, Figure 1 As shown, the oil-gas mixed transmission device also includes a one-way valve 19 and a third ball valve 183. One end of the one-way valve 19 is connected to the external oil pipeline 15, and the other end of the one-way valve 19 is connected to one end of the third ball valve 183 through a pipeline. The other end of the third ball valve 183 is connected to the discharge port 6 through a pipeline. The oil-gas mixture compressed by the triangular rotor compressor 10 passes through the third ball valve 183 and the one-way valve 19 in sequence and is collected to the gathering station through the external oil pipeline 15. The one-way valve 19 is used to prevent the oil-gas mixture from flowing back.

[0042] In another embodiment of the present application, Figure 2 As shown, the triangular rotor compressor 10 includes a cylinder body 1, a center shaft 3 is arranged in the cylinder body 1, the triangular rotor 2 is rotatably mounted on the center shaft 3, the center shaft 3 is connected to the driving mechanism 14 so as to drive the triangular rotor 2 to rotate in the cylinder body 1, the first feed port 4 and the discharge port 6 are arranged on one side of the cylinder body 1, and the second feed port 5 is arranged on the other side of the cylinder body 1.

[0043] In the above embodiment, if Figures 3 to 6 As shown, the triangular rotor 2 rotates eccentrically in the cylinder body 1 with the central axis 3 as the center, thereby forming a first chamber 7, a second chamber 8 and a third chamber 9 inside the cylinder body 1, the first chamber 7 is arranged corresponding to the first feed port 4, the second chamber 8 is arranged corresponding to the second feed port 5, and the third chamber 9 is arranged corresponding to the discharge port 6.

[0044] In the above embodiment, if Figure 3 As shown, the triangular rotor 2 includes a rotor body 21, and curved surfaces linearly fitted with the inner wall of the cylinder body 1 are respectively arranged on the three side walls of the rotor body 21, so that the rotor body 21 always maintains linear fit with the inner wall of the cylinder body 1 during rotation, and pit portions 23 are respectively arranged on the three side walls of the rotor body 21. The pit portions 23 and the cylinder body 1 jointly determine the space of the three chambers. Therefore, the compression ratio of the three chambers can be controlled by adjusting the volume of the pit portions 23. The larger the volume of the pit portions 23, the smaller the compression ratio of the three chambers. A center hole 22 is provided in the middle of the rotor body 21. The center hole 22 is eccentrically matched with the center axis 3 so that while the rotor body 21 revolves around the center axis 3, the rotor body 21 rotates around itself.

[0045] In one embodiment of the present application, Figure 4As shown, an outer gear ring 31 is provided on the outer wall of the central shaft 3, and an inner gear ring 24 is provided on the inner wall of the central hole 22. When the triangular rotor 2 rotates, the outer gear ring 31 and the inner gear ring 24 are meshed with each other.

[0046] Optionally, the ratio of the number of teeth of the inner gear ring 24 to the number of teeth of the outer gear ring 31 is 3:2.

[0047] Optionally, the cylinder body 1 of the triangular rotor compressor 10 is an "8"-shaped structure.

[0048] The present application also provides a method for mixing oil and gas. Figure 2 As shown, the associated gas from the oil well enters the first chamber 7 of the triangular rotor compressor 10 through the first feed port 4, and the central axis 3 of the triangular rotor compressor 10 drives the triangular rotor 2 to rotate eccentrically. The volume of the first chamber 7 gradually increases during the rotation of the triangular rotor 2 and forms an associated gas suction process;

[0049] like Figure 3 As shown, the associated gas in the first chamber 7 moves toward the second feed port 5 together with the first chamber 7, and the volume of the first chamber 7 gradually decreases so that the associated gas is compressed, forming a gas compression process;

[0050] like Figure 4 As shown, the first chamber 7 is transformed into the second chamber 8, and the oil from the oil well enters the second chamber 8 through the second feed port 5 to form a liquid inlet process;

[0051] like Figure 5 As shown, the second chamber 8 moves toward the discharge port 6 and gradually expands, and the associated gas and oil are mixed in the second chamber 8 to form an oil-gas mixture, forming an oil-gas mixing process;

[0052] like Figure 6 As shown, the oil-gas mixture is discharged through the discharge port 6. During the discharge, the triangular rotor 2 provides discharge pressure under the action of the driving mechanism 14, forming a pressurized discharge process.

[0053] In one embodiment of the present application, the outer gear ring 31 of the central shaft 3 is tightly meshed with the inner gear ring 24 of the triangular rotor 2, and the central shaft 3 is driven and connected to the driving mechanism 14 to drive the triangular rotor 2 to move. The flow rate and the suction amount of the associated gas can be controlled by adjusting the driving mechanism 14.

[0054] Optionally, the driving mechanism 14 may be an electric motor, a diesel engine or a gasoline engine.

[0055] The present application uses an electric motor, a diesel engine or a gasoline engine as a power source to drive the central shaft 3 and thereby drive the triangular rotor 2 to eccentrically rotate, so that the triangular rotor compressor 10 of the present application can be used in the field of oil and gas mixed transportation of associated gas and petroleum in oil wells, thereby achieving stable, reliable and efficient oil and gas mixed transportation.

[0056] The preferred specific implementation modes and embodiments of the present application are described in detail above in conjunction with the accompanying drawings, but the present application is not limited to the above implementation modes and embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the concept of the present application.

Claims

1. A method for mixed oil and gas transportation, It is characterized in that Associated gas from an oil well enters a first chamber (7) of the triangular rotor compressor (10) through a first feed port (4) of the triangular rotor compressor (10); a central axis (3) of the triangular rotor compressor (10) drives the triangular rotor (2) of the triangular rotor compressor (10) to rotate eccentrically; a volume of the first chamber (7) gradually increases during the rotation of the triangular rotor (2), thereby forming an associated gas suction process; The associated gas in the first chamber (7) moves together with the first chamber (7) toward the second feed port (5) of the triangular rotor compressor (10), and the volume of the first chamber (7) gradually decreases so that the associated gas is compressed, thereby forming a gas compression process; The first chamber (7) is transformed into the second chamber (8) of the triangular rotor compressor (10), and the oil from the oil well enters the second chamber (8) through the second feed inlet (5) to form a liquid inlet process; The second chamber (8) moves toward the discharge port (6) of the triangular rotor compressor (10) and gradually expands, and the associated gas and petroleum are mixed in the second chamber (8) to form an oil-gas mixture, forming an oil-gas mixing process; The oil-gas mixture is discharged through the discharge port (6), and during the discharge, the triangular rotor (2) provides discharge pressure under the action of the driving mechanism (14), thereby forming a pressurized discharge process.

2. The oil-gas mixed transportation method according to claim 1, It is characterized in that The outer gear ring (31) of the central shaft (3) meshes with the inner gear ring (24) of the triangular rotor (2), and the central shaft (3) is drivingly connected to the driving mechanism (14) to drive the triangular rotor (2) to move.

3. An oil and gas mixed transmission device, It is characterized in that The invention comprises a triangular rotor compressor (10), a driving mechanism (14) and an oil feeding pump (13), wherein the triangular rotor compressor (10) comprises a triangular rotor (2), a first feed inlet (4), a second feed inlet (5) and a discharge port (6), wherein the first feed inlet (4) is connected to an associated gas pipeline (16) of an oil well so that associated gas from the oil well enters the triangular rotor compressor (10) through the first feed inlet (4), and the second feed inlet (5) is connected to an output end of the oil feeding pump (13) through a pipeline, and the output of the oil feeding pump (13) is connected to the output end of the oil feeding pump (13). The inlet end is connected to a produced liquid pipeline (17) of an oil well. The oil from the oil well is transported to the triangular rotor compressor (10) through the produced liquid pipeline (17) and the oil feed pump (13) to be mixed with the associated gas to obtain an oil-gas mixture. The outlet (6) is connected to an external oil pipeline (15) of the oil well to transport the oil-gas mixture. The driving mechanism (14) is in transmission connection with the central shaft (3) of the triangular rotor (2) to drive the triangular rotor (2) to rotate. The driving mechanism (14) is an electric motor, a diesel engine or a gasoline engine. The triangular rotor compressor (10) comprises a cylinder body (1), a central shaft (3) is arranged in the cylinder body (1), the triangular rotor (2) is rotatably mounted on the central shaft (3), the central shaft (3) is connected to the driving mechanism (14) so ​​as to drive the triangular rotor (2) to rotate in the cylinder body (1), the first feed inlet (4) and the discharge outlet (6) are arranged on one side of the cylinder body (1), and the second feed inlet (5) is arranged on the other side of the cylinder body (1); The triangular rotor (2) rotates eccentrically in the cylinder body (1) about the central axis (3), thereby forming a first chamber (7), a second chamber (8) and a third chamber (9) inside the cylinder body (1), wherein the first chamber (7) is arranged corresponding to the first feed port (4), the second chamber (8) is arranged corresponding to the second feed port (5), and the third chamber (9) is arranged corresponding to the discharge port (6).

4. The oil-gas mixed transmission device according to claim 3, It is characterized in that It also includes a stop valve (11) and a first ball valve (181), wherein two ends of the stop valve (11) are respectively connected to the second feed port (5) and the output end of the oil feeding pump (13) through pipelines, and two ends of the first ball valve (181) are respectively connected to the produced liquid pipeline (17) and the input end of the oil feeding pump (13).

5. The oil-gas mixed transmission device according to claim 3, It is characterized in that It also includes a flow meter (12) and a second ball valve (182), one end of the flow meter (12) is connected to the first feed port (4) via a pipeline, the other end of the flow meter (12) is connected to one end of the second ball valve (182) via a pipeline, and the other end of the second ball valve (182) is connected to the associated gas pipeline (16).

6. The oil-gas mixed transmission device according to claim 3, It is characterized in that It also includes a one-way valve (19) and a third ball valve (183), one end of the one-way valve (19) is connected to the external oil pipeline (15), the other end of the one-way valve (19) is connected to one end of the third ball valve (183) through a pipeline, and the other end of the third ball valve (183) is connected to the discharge port (6) through a pipeline.

7. The oil-gas mixed transmission device according to claim 3, It is characterized in that The triangular rotor (2) comprises a rotor body (21), and curved surfaces which are linearly fitted with the inner wall of the cylinder body (1) are respectively arranged on the three side walls of the rotor body (21), so that the rotor body (21) is linearly fitted with the inner wall of the cylinder body (1) during rotation, and recessed portions (23) are respectively arranged on the three side walls of the rotor body (21), and the recessed portions (23) and the cylinder body (1) together form three chamber spaces.

8. The oil-gas mixed transmission device according to claim 7, It is characterized in that An outer gear ring (31) is provided on the outer wall of the central shaft (3), a central hole (22) is provided in the middle of the rotor body (21), and an inner gear ring (24) is provided on the inner wall of the central hole (22); when the triangular rotor (2) rotates, the outer gear ring (31) and the inner gear ring (24) mesh with each other.

9. The oil-gas mixed transmission device according to claim 8, It is characterized in that The ratio of the number of teeth of the inner gear ring (24) to the number of teeth of the outer gear ring (31) is 3:2; The cylinder body (1) of the triangular rotor compressor (10) is an "8"-shaped structure.

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