Shale gas one-machine multi-lift pumping and lifting integrated pressurization system

Abstract

The utility model relates to the technical field of pressurization, in particular to a shale gas one-machine multi-lift pumping and lifting integrated pressurization system. A shale gas one-machine multi-lift pumping and lifting integrated pressurization system comprises a compressor, a gas lift pipeline and a single-well metering manifold table. The single-well metering manifold platform is connected with a low-pressure well; an air inlet of the compressor is connected with the single-well metering manifold table; a gas outlet of the compressor is connected with the gas lift pipeline; and the gas lift pipeline is connected with the flooding well. Compared with the prior art, the single-well metering manifold platform has the advantages that one compressor can simultaneously carry out gas lift drainage on a plurality of flooded wells, so that the utilization rate of equipment is improved, and the cost of the equipment is reduced; and on the other hand, the functions of gas extraction, pressurization, gas lifting and the like are integrated in one system, so that the equipment structure is simplified, and the energy consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of pressurization technology, and in particular to an integrated pressurization system for shale gas extraction and multi-stage lifting. Background Technology

[0002] In shale gas extraction, low-pressure wells and water-flooded wells are frequently encountered. Low-pressure wells, due to insufficient formation pressure, make it difficult for gas to flow naturally, requiring pressurization for extraction. Water-flooded wells, on the other hand, suffer from excessive fluid accumulation within the wellbore, hindering normal gas flow and necessitating drainage through methods such as gas lift. Common pressurization methods in shale gas extraction mainly include compressor pressurization and gas lift pressurization. Compressor pressurization increases gas pressure through mechanical compression, but it typically only works on a single well, resulting in low efficiency. Gas lift pressurization, however, requires an additional gas source and has high requirements for gas pressure and flow rate. Furthermore, existing pressurization and gas lift systems mostly operate independently, lacking integrated design, leading to low equipment utilization and high energy consumption.

[0003] In the prior art, Chinese invention patent application (publication number CN118774685A) discloses a shale gas low-pressure stage gas lift drainage gas production device and its implementation method. This involves constructing a new high-pressure gathering and transmission branch line to the gas production tree natural gas transmission process pipeline, connecting the gas wellhead gas production tree to the high-pressure gathering and transmission pipeline, and using the high-pressure natural gas in the high-pressure gathering and transmission pipeline as the gas lift source for the gas well. After the process is connected, the natural gas from the high-pressure gathering and transmission pipeline enters the gas well, enabling gas lift drainage. Gas lift can be achieved using the high-pressure gathering and transmission pipeline, eliminating the need for vehicle-mounted gas lift vehicles and compressors, resulting in significant cost savings. A regulating valve controls the gas lift injection volume, with the valve opening controlled between 0-100%. This allows for precise adjustment and control of the gas lift volume, achieving optimal gas lift performance and meeting the needs of refined management. A data acquisition and monitoring control system allows for remote control of gas lift start / stop, injection volume adjustment, and other functions, eliminating the need for on-site personnel operation, saving labor, and improving efficiency.

[0004] Although existing air-lift drainage technology can achieve remote control, it has the following technical problems:

[0005] 1. It fails to integrate functions such as gas extraction, pressurization, and gas lift, resulting in cumbersome operation and high energy consumption;

[0006] 2. It was not possible to use a single compressor to simultaneously perform air-lift drainage on multiple flooded wells, resulting in high equipment costs. Utility Model Content

[0007] To overcome the problems of existing technologies that fail to achieve simultaneous gas lift drainage of multiple water-flooded wells with a single compressor and fail to integrate gas extraction, pressurization, and gas lift functions, this utility model proposes a shale gas multi-lift integrated pressurization system. The utility model provides the following technical solution:

[0008] On the one hand, this utility model proposes an integrated pressurization system for shale gas extraction and multi-stage lifting, including a compressor, gas lift pipeline and single-well metering manifold;

[0009] The single-well metering manifold is connected to the low-pressure well;

[0010] The compressor's air inlet is connected to the single-well metering manifold.

[0011] The compressor's outlet is connected to the air lift pipeline;

[0012] The gas lift pipeline is connected to the flooded well.

[0013] Preferably, the gas pressure of the low-pressure well is no greater than 0.5 MPa.

[0014] A further preferred embodiment of the shale gas multi-stage extraction and booster system includes a vertical gravity separator connected to the air inlet of the compressor.

[0015] More preferably, the single-well metering manifold is connected to the vertical gravity separator;

[0016] Preferably, the compressor is an integrated pump-and-lift compressor.

[0017] More preferably, the shale gas in the low-pressure well is pressurized by the integrated extraction compressor to obtain pressurized gas, and the pressure of the pressurized gas is not less than 16 MPa.

[0018] Preferably, the air lift pipeline is divided into an upper air lift pipeline and a lower air lift pipeline.

[0019] Preferably, it also includes two electrically adjustable valves, with one electrically adjustable valve connected in series with each of the upper and lower air lift pipelines.

[0020] Preferably, it also includes two high-pressure flow meters, with one high-pressure flow meter connected in series with each of the upper and lower air lift pipelines.

[0021] This invention proposes an integrated shale gas extraction and pressurization system, comprising a compressor, a gas lift pipeline, and a single-well metering manifold. The single-well metering manifold is connected to a low-pressure well. The compressor's inlet is connected to the single-well metering manifold; the compressor's outlet is connected to the gas lift pipeline; and the gas lift pipeline is connected to a flooded well. Compared to existing technologies, this invention, by employing the single-well metering manifold, enables a single compressor to simultaneously perform gas lift drainage on multiple flooded wells, improving equipment utilization and reducing equipment costs. Furthermore, by integrating gas extraction, pressurization, and gas lift functions into a single system, this invention simplifies the equipment structure and reduces energy consumption. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a shale gas multi-stage extraction and pressurization integrated system in Example 1.

[0023] Figure 2 This is a schematic diagram of a shale gas multi-stage extraction and pressurization integrated system in Example 1.

[0024] Figure labels: 10-Shale gas multi-lift integrated pressurization system; 11-Compressor; 12-Gas lift pipeline; 13-Single well metering manifold; 14-Vertical gravity separator; 15-Electric regulating valve; 16-High pressure flow meter; 20-Low pressure well; 30-Water-flooded well. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to specific embodiments. However, it should not be construed as limiting the scope of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0026] Unless otherwise specified, the use of terms such as "upper," "lower," "left," "right," "center," "inner," and "outer" to indicate orientation or positional relationships in the description of specific embodiments of this utility model is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationship in which the utility model product / equipment / device is typically placed during use. These terms are merely for the purpose of facilitating the description of the utility model solution or simplifying the description in specific embodiments, enabling those skilled in the art to quickly understand the solution, and do not indicate or imply that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, they should not be construed as limitations on this utility model.

[0027] Furthermore, the use of terms such as "horizontal," "vertical," "suspended," and "parallel" does not imply that the corresponding device / component / element must be absolutely horizontal, vertical, suspended, or parallel, but rather that it can be slightly tilted or have a deviation. For example, "horizontal" merely means that its direction is more horizontal relative to "vertical," not that the structure must be completely horizontal, but can be slightly tilted. Alternatively, it can be simplified to mean that the corresponding device / component / element, when set in a "horizontal," "vertical," "suspended," or "parallel" direction, can have an error / deviation of ±10% relative to the corresponding direction, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, and more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the present invention.

[0028] Furthermore, the use of terms such as "first," "second," and "third" in terminology is merely for distinguishing descriptions of identical or similar components and should not be interpreted as emphasizing or implying the relative importance of a particular component.

[0029] Furthermore, in the description of the embodiments of this utility model, "several", "multiple", and "several" represent at least two. The number can be any number, such as two, three, four, five, six, seven, eight, or nine, and can even exceed nine.

[0030] Furthermore, in the description of the technical solution of this utility model, unless otherwise explicitly specified / limited / restricted, the terms "set up," "install," "connect," "link," "equipped with," "laid out," and "arranged" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to common connection methods in the art, such as welding, riveting, bolting, and threaded connections. Such connections can be mechanical, electrical, or communication connections; they can be direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0031] Example 1

[0032] To overcome the problems in existing technologies where a single compressor cannot simultaneously perform gas lift drainage on multiple water-flooded wells 30 and where gas extraction, pressurization, and gas lift functions cannot be integrated, this embodiment proposes a shale gas multi-lift integrated pressurization system 10, including a compressor 11, a gas lift pipeline 12, and a single-well metering manifold 13. The principle block diagram is shown below. Figure 1 As shown;

[0033] The single-well metering manifold 13 is connected to the low-pressure well 20;

[0034] The air inlet of the compressor 11 is connected to the single-well metering manifold 13;

[0035] The air outlet of the compressor 11 is connected to the air lift pipeline 12;

[0036] The air lift pipeline 12 is connected to the flooded well 30.

[0037] The gas pressure of the low-pressure well 20 is no greater than 0.5 MPa.

[0038] A shale gas multi-stage extraction and booster system 10 also includes a vertical gravity separator 14, which is connected to the air inlet of the compressor 11.

[0039] The single-well metering manifold 13 is connected to the vertical gravity separator 14;

[0040] The compressor 11 is specifically an integrated pumping compressor.

[0041] The shale gas in the low-pressure well 20 is pressurized by the integrated extraction compressor to obtain pressurized gas, and the pressure of the pressurized gas is not less than 16 MPa.

[0042] The air lift line 12 is divided into an upper air lift line and a lower air lift line.

[0043] It also includes two electrically adjustable valves 15, with one electrically adjustable valve 15 connected in series with each of the upper and lower air lift pipelines.

[0044] It also includes two high-pressure flow meters 16, the detection range of which is 4MPa to 16MPa. The upper half of the gas lift pipeline and the lower half of the gas lift pipeline are connected in series with one high-pressure flow meter 16.

[0045] Example 2

[0046] A schematic diagram of the shale gas multi-stage extraction and booster system 10 is shown below. Figure 2 As shown, a combined air-lift compressor is used to simultaneously perform air extraction from the low-pressure well 20 and drainage from the flooded well 30. This allows one compressor to simultaneously perform air-lift drainage from multiple flooded wells 30, improving equipment utilization and reducing equipment costs. Furthermore, by integrating gas extraction, pressurization, and air-lift functions into one system, the equipment structure is simplified and energy consumption is reduced.

[0047] In this embodiment, the single-well metering manifold 13 is specifically connected to eight low-pressure extraction wells. By converging the gas production pipelines to the single-well metering manifold 13, simultaneous extraction control of multiple low-pressure gas production wells can be achieved.

[0048] The single-well metering manifold 13 inputs the extracted low-pressure gas into the vertical gravity separator 14;

[0049] The air inlet of the integrated extraction compressor is connected to the vertical gravity separator 14. The gas is extracted from eight low-pressure extraction wells through the single-well metering manifold 13. The pressure in the low-pressure extraction wells is 0.1-0.5MPa. The integrated extraction compressor pressurizes the gas to 16MPa.

[0050] The pressurized gas is delivered to the gas lift pipeline 12, which is divided into an upper branch and a lower branch to split the pressurized gas. The pressurized gas is delivered to the water-flooded wells 30 in the upper and lower branches respectively.

[0051] Before the gas is delivered to the flooded well 30, it needs to be regulated by an electric regulating valve 15. Both the upper and lower gas lift pipelines are equipped with electric regulating valves 15 and high-pressure flow meters 16.

[0052] The high-pressure flow meter 16 can monitor the gas flow rate in the gas lift pipeline 12 in real time. By feeding back the real-time data to the electric regulating valve 15, and combining the feedback flow data to set the specific gas injection volume, the electric regulating valve 15 can achieve precise control of the gas injection volume and improve the gas lift effect. The whole process is automated, which reduces labor costs and improves work efficiency.

[0053] Finally, the pressurized gas is injected into the water-flooded well 30 through the upper and lower gas lift pipelines to generate a gas lift effect and discharge the accumulated liquid in the well, thus achieving drainage and gas production.

[0054] This embodiment proposes a shale gas multi-lift integrated pressurization system 10, including an integrated lift compressor, pipelines, gas lift pipeline 12, vertical gravity separator 14, single-crystal metering manifold, electric regulating valve 15, and high-pressure flow meter 16. The single-well metering manifold 13 aggregates eight low-pressure extraction wells. The vertical gravity separator 14 is connected to the single-well metering manifold 13 to receive low-pressure gas input from the low-pressure extraction wells. The vertical gravity separator 14 is connected to the air inlet of the integrated lift compressor to compress and pressurize the low-pressure gas. The integrated lift compressor is connected to the gas lift pipeline 12, which is divided into an upper branch and a lower branch. The water-flooded well 30 is connected to both the upper and lower branches of the gas lift pipeline. The electric regulating valve 15 and the high-pressure flow meter 16 are connected to the gas lift pipeline 12 in series.

[0055] Compared to existing technologies, this invention utilizes a single-well metering manifold to divide the gas lift pipeline into upper and lower branches, enabling one compressor to simultaneously perform gas lift drainage on multiple flooded wells 30, thereby improving equipment utilization and reducing equipment costs. Furthermore, by integrating gas extraction, pressurization, and gas lift functions into a single system, this invention simplifies the equipment structure, reduces energy consumption, minimizes equipment space requirements and manual operation needs, lowers operational risks, and enhances safety.

[0056] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A shale gas multi-lift integrated pressurization system, comprising a compressor and gas lift pipelines, characterized in that, It also includes single-well metering manifolds; The single-well metering manifold is connected to the low-pressure well; The compressor's air inlet is connected to the single-well metering manifold. The compressor's outlet is connected to the air lift pipeline; The gas lift pipeline is connected to the flooded well.

2. The shale gas multi-stage extraction and pressurization integrated system according to claim 1, characterized in that, The gas pressure in the low-pressure well is no greater than 0.5 MPa.

3. The shale gas multi-stage extraction and pressurization integrated system according to claim 2, characterized in that, It also includes a vertical gravity separator connected to the air inlet of the compressor.

4. The shale gas multi-stage extraction and pressurization integrated system according to claim 3, characterized in that, The single-well metering manifold is connected to the vertical gravity separator.

5. The shale gas multi-stage extraction and pressurization integrated system according to claim 1, characterized in that, The compressor is specifically an integrated pump-and-lift compressor.

6. The shale gas multi-stage extraction and pressurization integrated system according to claim 5, characterized in that, The shale gas in the low-pressure well is pressurized by the integrated extraction compressor to obtain pressurized gas, and the pressure of the pressurized gas is not less than 16 MPa.

7. The shale gas integrated multi-stage extraction and pressurization system according to claim 1, characterized in that, The air lift pipeline is divided into an upper air lift pipeline and a lower air lift pipeline.

8. The shale gas multi-stage extraction and pressurization integrated system according to claim 7, characterized in that, It also includes two electrically adjustable valves, with one electrically adjustable valve connected in series with each of the upper and lower air lift pipelines.

9. The shale gas multi-stage extraction and pressurization integrated system according to claim 7, characterized in that, It also includes two high-pressure flow meters, with one high-pressure flow meter connected in series with each of the upper and lower gas lift pipelines.

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