Natural gas lift system

Abstract

The utility model discloses a natural gas lift system which solves the problems that an existing gas lift system is relatively fixed and cannot meet various requirements along with specific conditions of a mining site. Comprising a gas inlet, a gas-lift first-stage gas inlet separation tank, a first gas inlet buffer tank, a gas-lift first-stage cylinder, a first exhaust buffer tank, a first air cooler, a gas-lift second-stage gas inlet separation tank, a second gas inlet buffer tank, a gas-lift second-stage cylinder, a second exhaust buffer tank, a second air cooler, a gas-lift third-stage gas inlet separation tank, a gas-lift third-stage cylinder, a third exhaust buffer tank and a third air cooler. And an exhaust port, an air inlet pipeline and an exhaust main pipeline. By means of the unique design and composition, the efficient and stable gas lifting process is achieved, the oil and gas exploitation efficiency and safety are improved, and high flexibility and adaptability are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of natural gas compression, in particular to a natural gas lift system. Background Art

[0002] my country's economic structure and energy structure are both in a critical period of transformation. New clean energy industries such as natural gas, shale gas, and coalbed methane are facing huge development opportunities. In the process of natural gas exploitation in oil and gas wells, when the energy supplied by the bottom of the gas well is not enough to lift the oil and gas from the bottom of the well to the ground, the oil and gas well will stop spraying. It is necessary to inject high-pressure natural gas into the bottom of the well, and use the expansion of the gas to reduce the density of the mixed liquid in the well, thereby lifting the oil and gas in the well to the ground. This is called gas lift.

[0003] In the process of oil and gas well exploitation, when the energy supplied by the bottom of the gas well is not enough to lift the oil and gas from the bottom of the well to the ground, an efficient and reliable system is needed to achieve gas lift to ensure the continuous exploitation and production of the oil and gas well. In addition, the system also needs to have an efficient and stable gas lift process to improve the efficiency and safety of oil and gas exploitation, and have a high degree of flexibility and adaptability. However, the existing gas lift system is relatively fixed and cannot meet the specific conditions of the exploitation site and adapt to various requirements. Utility Model Content

[0004] The utility model provides a natural gas lift system to solve the above-mentioned technical problems.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] The present application provides a natural gas lift system, comprising an air inlet, a first-stage air inlet separator tank for air lift, a first air inlet buffer tank, a first-stage air lift cylinder, a first exhaust buffer tank, a first air cooler, a second-stage air inlet separator tank for air lift, a second air inlet buffer tank, a second-stage air lift cylinder, a second exhaust buffer tank, a second air cooler, a third-stage air inlet separator tank for air lift, a third-stage air lift cylinder, a third exhaust buffer tank, a third air cooler, an air outlet, an air inlet pipeline, and an exhaust main pipeline;

[0007] The gas enters the system from the air inlet, and enters the gas lift primary air inlet separation tank through the air inlet pipe, the outlet of the gas lift primary air inlet separation tank is connected to the first inlet of the first air inlet buffer tank, the outlet of the first air inlet buffer tank is connected to the inlet of the gas lift primary cylinder, the outlet of the gas lift primary cylinder is connected to the inlet of the first exhaust buffer tank, the outlet of the first exhaust buffer tank is connected to the inlet of the first air cooler, the outlet of the first air cooler is connected to the inlet of the gas lift secondary air inlet separation tank, the outlet of the gas lift secondary air inlet separation tank is connected to the inlet of the second air inlet buffer tank, and the second The outlet of the air intake buffer tank is connected to the inlet of the gas lift secondary cylinder, the outlet of the gas lift secondary cylinder is connected to the inlet of the second exhaust buffer tank, the outlet of the second exhaust buffer tank is connected to the inlet of the second air cooler, the outlet of the second air cooler is connected to the inlet of the gas lift tertiary air intake separation tank, the outlet of the gas lift tertiary air intake separation tank is connected to the inlet of the gas lift tertiary cylinder, the outlet of the gas lift tertiary cylinder is connected to the inlet of the third exhaust buffer tank, the outlet of the third exhaust buffer tank is connected to the inlet of the third air cooler, and the gas enters the exhaust main pipeline after being cooled by the third air cooler.

[0008] Furthermore, an air intake ball valve is provided on the air intake pipeline.

[0009] Furthermore, a bypass pipe is provided on the exhaust main pipe, and the bypass pipe is connected to the air intake pipe. A bypass pneumatic ball valve and a bypass manual ball valve are provided on the bypass pipe. The pneumatic ball valve and the bypass manual ball valve are connected in parallel. The bypass pipe is mainly used for unloading the gas lift pipeline, and the bypass manual ball valve is used to adjust the gas lift exhaust volume.

[0010] Furthermore, the exhaust main pipeline is connected to a first exhaust pipe and a second exhaust pipe, and the second exhaust pipe is provided with an exhaust one-way valve, an exhaust ball valve and an exhaust port.

[0011] Furthermore, it also includes a gathering and exhaust pipe, on which a second exhaust pipe ball valve is provided. The second exhaust pipe is connected to the gathering and exhaust pipe. When the gas lift function is not needed, the exhaust ball valve is closed and the second exhaust pipe ball valve is opened to allow the gas lift gas to enter the gathering and exhaust pipe and then be discharged from the gathering and exhaust port.

[0012] Furthermore, the gathering and exhaust pipe is connected to the second inlet of the first air intake buffer tank through the gas lift high-pressure gas intake pipeline, and the gas lift high-pressure gas intake pipeline is provided with an gas intake pressure regulating ball valve, a gas lift high-pressure gas intake pressure regulating valve and a gas intake pressure regulating valve bypass manual ball valve, and the gas intake pressure regulating ball valve and the gas lift high-pressure gas intake pressure regulating valve are connected in series.

[0013] Furthermore, a first plate valve is provided on the first inlet pipe of the first air intake buffer tank, and a second plate valve is provided on the second inlet pipe of the first air intake buffer tank.

[0014] Beneficial effects achieved by the utility model:

[0015] (1) The natural gas lift system provided by the utility model adopts one-, two- and three-stage compressed gas lift, that is, the gas is compressed at three stages to reach the gas lift pressure, thereby effectively realizing that during the production process of oil and gas wells, when the energy supplied by the bottom layer of the gas well is insufficient to lift the oil and gas from the bottom of the well to the ground, the high-pressure natural gas is injected and the expansion of the gas is utilized to reduce the density of the mixed liquid in the well, thereby lifting the oil and gas in the well to the ground.

[0016] (2) The natural gas lift system provided by the utility model realizes an efficient and stable gas lift process through its unique design and composition, improves the efficiency and safety of oil and gas extraction, and has a high degree of flexibility and adaptability. The system is provided with structures such as a bypass pipeline, a second exhaust pipe, and a gathering and transmission exhaust pipe, which can conveniently guide the gas lift gas out of the system when the gas lift function is not needed, thereby increasing the flexibility and adaptability of the system; by providing regulating devices such as a gas intake pressure regulating ball valve and a gas lift high-pressure gas intake pressure regulating valve, the system can take gas from the gathering and transmission exhaust pipe and adjust the intake pressure when the total intake source pressure is low, thereby ensuring the stability and safety of the gas lift process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a process flow chart of an embodiment of the utility model;

[0018] Reference numerals:

[0019] 1. Inlet; 2. Inlet ball valve; 3. First-stage air inlet separator tank; 4. First air inlet buffer tank; 5. First-stage air lift cylinder; 6. First exhaust buffer tank; 7. First air cooler; 8. Second-stage air inlet separator tank; 9. Second air inlet buffer tank; 10. Second-stage air lift cylinder; 11. Second exhaust buffer tank; 12. Second air cooler; 13. Third-stage air inlet separator tank; 14. Third-stage air lift cylinder; 15. Third exhaust buffer tank; 16. Third air cooler; 17. Exhaust check valve; 18. Exhaust Ball valve; 19. Exhaust port; 20. Air intake pipeline; 21. Gathering and transporting exhaust port; 22. First plate valve; 23. Second plate valve; 24. Gathering and transporting exhaust pipeline; 25. Air extraction pressure regulating ball valve; 26. Gas lift high-pressure air extraction pressure regulating valve; 27. Air extraction pressure regulating valve bypass manual ball valve; 28. Gas lift high-pressure air extraction pipeline; 29. ​​Exhaust main pipeline; 30. Bypass pipeline; 31. Bypass pneumatic ball valve; 32. Bypass manual ball valve; 33. First exhaust pipe; 34. Second exhaust pipe; 35. Second exhaust pipe ball valve.

[0020] The drawings are only used for illustrative purposes and should not be construed as limitations on this patent. In order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product. For those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted. The same or similar numbers correspond to the same or similar parts. The terms describing the positional relationship in the drawings are only used for illustrative purposes and should not be construed as limitations on this patent. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0022] The technical solution of the present utility model is described in detail below in conjunction with the specific drawings.

[0023] Embodiment 1:

[0024] like Figure 1 As shown, a natural gas lift system adopts one-two-three-stage compressed gas lift, that is, the gas is compressed in three stages to reach the gas lift pressure, including an air inlet 1, a gas lift first-stage air inlet separation tank 3, a first air inlet buffer tank 4, a gas lift first-stage cylinder 5, a first exhaust buffer tank 6, a first air cooler 7, a gas lift second-stage air inlet separation tank 8, a second air inlet buffer tank 9, a gas lift second-stage cylinder 10, a second exhaust buffer tank 11, a second air cooler 12, a gas lift third-stage air inlet separation tank 13, a gas lift third-stage cylinder 14, a third exhaust buffer tank 15, a third air cooler 16, an exhaust port 19, an air inlet pipeline 20 and an exhaust main pipeline 29;

[0025] The gas enters the system from the air inlet 1, and enters the gas lift primary air inlet separation tank 3 through the air inlet pipe 20, the outlet of the gas lift primary air inlet separation tank 3 is connected to the first inlet of the first air inlet buffer tank 4, the outlet of the first air inlet buffer tank 4 is connected to the inlet of the gas lift primary cylinder 5, the outlet of the gas lift primary cylinder 5 is connected to the inlet of the first exhaust buffer tank 6, the outlet of the first exhaust buffer tank 6 is connected to the inlet of the first air cooler 7, the outlet of the first air cooler 7 is connected to the inlet of the gas lift secondary air inlet separation tank 8, the outlet of the gas lift secondary air inlet separation tank 8 is connected to the inlet of the second air inlet buffer tank 9, the outlet of the second air inlet buffer tank 9 is connected to the inlet of the gas lift secondary cylinder 10 The outlet of the gas lift secondary cylinder 10 is connected with the inlet of the second exhaust buffer tank 11, the outlet of the second exhaust buffer tank 11 is connected with the inlet of the second air cooler 12, the outlet of the second air cooler 12 is connected with the inlet of the gas lift tertiary air intake separation tank 13, the outlet of the gas lift tertiary air intake separation tank 13 is connected with the inlet of the gas lift tertiary cylinder 14, the outlet of the gas lift tertiary cylinder 14 is connected with the inlet of the third exhaust buffer tank 15, the outlet of the third exhaust buffer tank 15 is connected with the inlet of the third air cooler 16, the gas is cooled by the third air cooler 16 and then enters the exhaust main pipeline 29, and is connected to the customer's gas lift pipeline after passing through the first exhaust pipe 33 to the exhaust port 19.

[0026] The air intake pipe 20 is provided with an air intake ball valve 2.

[0027] A bypass pipe 30 is provided on the exhaust main pipe 29, and the bypass pipe 30 is connected to the intake pipe 20. A bypass pneumatic ball valve 31 and a bypass manual ball valve 32 are provided on the bypass pipe 30. The pneumatic ball valve 31 and the bypass manual ball valve 32 are connected in parallel. The bypass pipe 30 is mainly used for gas lift pipeline unloading, and the bypass manual ball valve 32 is used to adjust the gas lift exhaust volume.

[0028] Embodiment 2:

[0029] like Figure 1 As shown, on the basis of embodiment 1, a second exhaust pipe 34 is provided on the exhaust main pipeline 29, a second exhaust pipe ball valve 35 is provided on the second exhaust pipe 34, and the second exhaust pipe 34 is connected with the gathering and transmission exhaust pipe 24. When the gas lift function is not needed, the exhaust ball valve 18 is closed, and the second exhaust pipe ball valve 35 is opened, so that the gas lift gas enters the gathering and transmission exhaust pipe 24 and then is discharged from the system from the gathering and transmission exhaust port 21.

[0030] Embodiment 3:

[0031] like Figure 1As shown, on the basis of Example 1, the gathering and transmission exhaust pipe 24 is connected to the second inlet of the first air intake buffer tank 4 through the gas lift high-pressure air intake pipe 28, and the gas lift high-pressure air intake pipe 28 is provided with an air intake pressure regulating ball valve 25, a gas lift high-pressure air intake pressure regulating valve 26 and a gas intake pressure regulating valve bypass manual ball valve 27, and the air intake pressure regulating ball valve 25 and the gas lift high-pressure air intake pressure regulating valve 26 are connected in series. When the total intake air source pressure is low and cannot reach the gas lift pressure after the gas lift three-stage compression, the first plate valve 22 is closed at this time, and the second plate valve 23 is opened. At this time, the gas lift takes air from the gathering and transmission exhaust pipe 24, passes through the air intake pressure regulating ball valve 25, the gas lift high-pressure air intake pressure regulating valve 26, and the gas lift high-pressure air intake pipe 28, and enters the first air intake buffer tank 4. The function of the gas lift high-pressure air intake pressure regulating valve 26 is to adjust the gas lift intake pressure within the specified range. The gas intake pressure regulating valve bypass manual ball valve 27 is opened during pipeline purging and closed during normal use.

[0032] The serial numbers of the embodiments of the present application are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A natural gas lift system, characterized in that: It comprises an air inlet (1), an air lift first-stage air inlet separation tank (3), a first air inlet buffer tank (4), an air lift first-stage cylinder (5), a first exhaust buffer tank (6), a first air cooler (7), an air lift second-stage air inlet separation tank (8), a second air inlet buffer tank (9), an air lift second-stage cylinder (10), a second exhaust buffer tank (11), a second air cooler (12), an air lift third-stage air inlet separation tank (13), an air lift third-stage cylinder (14), a third exhaust buffer tank (15), a third air cooler (16), an air outlet (19) and an exhaust main pipeline (29); Gas enters the system from the air inlet (1), and enters the gas lift primary air inlet separation tank (3) through the air inlet pipeline (20). The outlet of the gas lift primary air inlet separation tank (3) is connected to the first inlet of the first air inlet buffer tank (4). The outlet of the first air inlet buffer tank (4) is connected to the inlet of the gas lift primary cylinder (5). The outlet of the gas lift primary cylinder (5) is connected to the inlet of the first exhaust buffer tank (6). The outlet of the first exhaust buffer tank (6) is connected to the inlet of the first air cooler (7). The outlet of the first air cooler (7) is connected to the inlet of the gas lift secondary air inlet separation tank (8). The outlet of the gas lift secondary air inlet separation tank (8) is connected to the inlet of the second air inlet buffer tank (9). The outlet is connected to the inlet of the gas lift secondary cylinder (10), the outlet of the gas lift secondary cylinder (10) is connected to the inlet of the second exhaust buffer tank (11), the outlet of the second exhaust buffer tank (11) is connected to the inlet of the second air cooler (12), the outlet of the second air cooler (12) is connected to the inlet of the gas lift tertiary air intake separation tank (13), the outlet of the gas lift tertiary air intake separation tank (13) is connected to the inlet of the gas lift tertiary cylinder (14), the outlet of the gas lift tertiary cylinder (14) is connected to the inlet of the third exhaust buffer tank (15), the outlet of the third exhaust buffer tank (15) is connected to the inlet of the third air cooler (16), and the gas enters the exhaust main pipeline (29) after being cooled by the third air cooler (16).

2. A natural gas lift system according to claim 1, characterized in that: The air intake pipeline (20) is provided with an air intake ball valve (2).

3. A natural gas lift system according to claim 1, characterized in that: The exhaust main pipeline (29) is provided with a bypass pipeline (30), the bypass pipeline (30) is communicated with the intake pipeline (20), the bypass pipeline (30) is provided with a bypass pneumatic ball valve (31) and a bypass manual ball valve (32), the pneumatic ball valve (31) and the bypass manual ball valve (32) are connected in parallel, the bypass pipeline (30) is mainly used for gas lift pipeline unloading, and the bypass manual ball valve (32) is used to adjust the gas lift exhaust volume.

4. A natural gas lift system according to claim 1, characterized in that: The exhaust main pipeline (29) is connected to a first exhaust pipe (33) and a second exhaust pipe (34), and the second exhaust pipe (34) is provided with an exhaust check valve (17), an exhaust ball valve (18) and an exhaust port (19).

5. A natural gas lift system according to claim 4, characterized in that: It also includes a gathering and transmission exhaust pipe (24), the second exhaust pipe (34) is provided with a second exhaust pipe ball valve (35), the second exhaust pipe (34) is connected to the gathering and transmission exhaust pipe (24), when the gas lift function is not needed, the exhaust ball valve (18) is closed, and the second exhaust pipe ball valve (35) is opened, so that the gas lift gas enters the gathering and transmission exhaust pipe (24) and is discharged from the system through the gathering and transmission exhaust port (21).

6. A natural gas lift system according to claim 5, characterized in that: The gathering and exhaust pipe (24) is connected to the second inlet of the first air inlet buffer tank (4) through the gas lift high-pressure gas intake pipeline (28), and the gas lift high-pressure gas intake pipeline (28) is provided with a gas intake pressure regulating ball valve (25), a gas lift high-pressure gas intake pressure regulating valve (26) and a gas intake pressure regulating valve bypass manual ball valve (27), and the gas intake pressure regulating ball valve (25) and the gas lift high-pressure gas intake pressure regulating valve (26) are connected in series.

7. A natural gas lift system according to claim 6, characterized in that: A first plate valve (22) is provided on the first inlet pipe of the first air intake buffer tank (4), and a second plate valve (23) is provided on the second inlet pipe of the first air intake buffer tank (4).

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