A gas lift device suitable for use in a shale gas well

Abstract

The utility model discloses a kind of gas lift devices suitable for shale gas well, including main line and spare line, the main line and spare line, the main line includes compressor (1) and first separator (2), the compressor (1) one end is connected with flow gas pipe (4), the other end is connected with first separator (2), first separator (2) is connected with gas well (5);The spare line includes second separator (3), the second separator (3) one end is connected with flow gas pipe (4), the other end is connected with gas well (5).The utility model has higher economy, can also greatly improve the gas lift safety of scene, and gas lift source gas is all within the safety range of equipment flow, and sustainable gas lift to gas well is assisted and discharged production.

Description

Technical Field

[0001] This utility model relates to the field of natural gas lift technology, and in particular to a gas lift device suitable for shale gas wells. Background Technology

[0002] Shale gas development typically employs a well factory model with platform well production. Each wellhead has an independent production tree. During production, due to factors such as different production cycles, downhole recovery levels, and fracturing at adjacent wells, wells are prone to issues like pressure channeling and water flooding. Furthermore, as production time increases, the formation's gas production capacity decreases. When a well is flooded, the well's own gas production cannot drain the accumulated liquid, causing the well to cease normal production and resulting in a "dead" state. In such cases, the well needs to undergo process treatment to drain the accumulated liquid and restore production.

[0003] Currently, many low-pressure shale gas wells in the work area are experiencing energy depletion due to pressure reduction, leading to a continuous decrease in well production. Prolonged periods of this can result in waterlogging and intermittent production. Therefore, external vehicle-mounted gas lift compressors are being introduced for gas lift. However, using external gas lift trucks requires connecting pipelines, and the economic cost is high for wells that cannot consistently produce continuously. Utility Model Content

[0004] This invention provides a gas lift device suitable for shale gas wells to solve the technical problem of how to effectively reduce gas lift costs while ensuring continuous production and continuous liquid discharge of low-pressure gas wells, and reducing the risk of leakage from high-pressure pipelines connected on-site.

[0005] This utility model is achieved using the following technical solution: a gas lift device suitable for shale gas wells, comprising a main line and a backup line. The main line includes a compressor and a first separator. One end of the compressor is connected to the process gas pipeline, and the other end is connected to the first separator, which is connected to the gas well. The backup line includes a second separator, one end of which is connected to the process gas pipeline, and the other end is connected to the gas well. The main line is used for the formal production process, while the backup line is used for the standby production process. The two processes are connected by tubing and casing. The standby production process connects to multiple gas wells on-site. Once the casing pressure of the gas wells drops below the pressure of the external pipeline network of the gas gathering platform, the compressor or the process gas pipeline can be used to directly supply process gas to achieve the purpose of gas lift.

[0006] Furthermore, the first separator is connected to the gas well via the main tubing and the main casing. A main tubing control valve and a main tubing connection control gate are installed on the main tubing; a main casing gate and a main casing connection control gate are installed on the main casing. Through the main tubing and the main casing, as well as the valves and gates thereon, high-pressure gas can be effectively injected downhole.

[0007] Furthermore, a first valve is provided between the process gas pipe and the compressor, a second valve is provided between the compressor and the first separator, and a third valve is provided between the first separator and the gas well.

[0008] Furthermore, the second separator is connected to the gas well via a backup oil pipe and a backup casing pipe. A backup oil pipe control valve and a backup oil pipe connection control gate are installed on the backup oil pipe; a backup casing gate is installed on the backup casing pipe. Through the backup oil pipe, the backup casing pipe, and the valves and gates on them, high-pressure gas can be effectively injected downhole.

[0009] Furthermore, a fourth valve is installed between the second separator and the process gas pipe, and a first gate valve and a second gate valve are also installed between the second separator and the gas well.

[0010] Furthermore, a fifth valve and a sixth valve are provided between the main line and the backup line, which enable gas exchange between the main line and the backup line.

[0011] The beneficial effects of this utility model are as follows: This utility model mainly utilizes the existing equipment of the gas gathering platform. The gate valves on both sides of the casing need to be connected and controlled by valves, while also connecting to a backup pipeline. Both pipelines can be routed to the venting pipeline. The backup pipeline connects to two separators; one separator supplies gas to the compressor, and the other directly supplies gas to the external transmission line. When the casing pressure of the gas well decreases or is lifted to below the external transmission pressure using a gas lift truck, a process gas lift can be adopted. This mainly utilizes one side of the backup pipeline. The valve connecting the separator to the external transmission pipeline is opened, and a portion of the external transmission gas flows into the separator and then into the downhole. After the gas well is lifted and connected, production resumes from the formal production process. The casing valve on the formal production pipeline side is closed to ensure normal gas lift drainage.

[0012] This invention can effectively reduce the gas lift costs for external contractors, making it highly economical, and can also greatly improve the safety of gas lift on site. The gas source and gas used for gas lift are all within the safe range of the equipment process, and can continuously support gas lift production at gas wells. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; 1-Compressor, 2-First separator, 3-Second separator, 4-Process gas pipe, 5-Gas well, 6-Fourth valve, 7-First valve, 8-Second valve, 9-Third valve, 10-Sixth valve, 11-Fifth valve, 12-First gate valve, 13-Main casing connection control gate, 14-Main oil pipe connection control gate, 15-Main casing gate, 16-Main oil pipe control valve, 17-Backup oil pipe control valve, 18-Backup casing gate, 19-Backup oil pipe connection control gate, 20-Second gate valve. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0016] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0017] The following detailed description, in conjunction with the accompanying drawings, outlines some embodiments of the present invention. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0018] See Figure 1 A gas lift device suitable for shale gas wells includes a main line and a backup line. The main line includes a compressor 1 and a first separator 2. One end of the compressor 1 is connected to a flow gas pipe 4, and the other end is connected to the first separator 2, which is connected to a gas well 5. The backup line includes a second separator 3, one end of which is connected to the flow gas pipe 4, and the other end is connected to the gas well 5. A fifth valve 11 and a sixth valve 10 are also provided between the main line and the backup line.

[0019] This utility model mainly utilizes an on-site external booster compressor 1, a first separator 2, a second separator 3, a main pipeline, and a backup pipeline to achieve gas lift. Specifically, one end of the wellhead's gas production tree is connected to the formal production process (i.e., the main pipeline), and the other end is connected to the backup production process (i.e., the backup pipeline). Both processes are connected via tubing casing. The backup production process connects to multiple gas wells on-site. After the pressure drop of gas well 5 casing is lower than the pressure of the gas gathering platform's pipeline network, the compressor 1 or process gas pipe 4 is used to directly supply process gas, which is then introduced into the backup pipeline process. High-pressure gas is injected downhole and, after being lifted by the gas lift well, can be supplied to the formal production process. The two pipelines do not interfere with each other.

[0020] In this embodiment, the first separator 2 is connected to the gas well 5 via the main oil pipe and the main casing. A main oil pipe control valve 16 and a main oil pipe connection control gate 14 are provided on the main oil pipe; a main casing gate 15 and a main casing connection control gate 13 are provided on the main casing; a first valve 7 is provided between the process gas pipe 4 and the compressor 1; a second valve 8 is provided between the compressor 1 and the first separator 2; and a third valve 9 is provided between the first separator 2 and the gas well 5.

[0021] In this embodiment, the second separator 3 is connected to the gas well 5 through a backup oil pipe and a backup casing pipe. A backup oil pipe control valve 17 and a backup oil pipe connection control gate 19 are provided on the backup oil pipe; a backup casing gate 18 is provided on the backup casing pipe; a fourth valve 6 is provided between the second separator 3 and the process gas pipe 4; and a first gate 12 and a second gate 20 are also provided between the second separator 3 and the gas well 5.

[0022] By controlling the valves and gates in the above pipelines, high-pressure gas can be injected into the gas well 5 through the compressor 1 and the first separator 2; or the high-pressure gas from the process gas pipe 4 can be injected into the gas well 5 directly through the second separator 3. Once the process is completed, the gas can be used in the formal production process. The two lines do not interfere with each other.

[0023] This invention primarily utilizes existing equipment on the gas gathering platform. The gate valves on both sides of the casing need to be connected and controlled by valves, while also connecting to a backup pipeline. Both pipelines can be routed to the venting pipeline. The backup pipeline connects to two separators; one separator supplies gas to the compressor, and the other directly supplies gas to the external output. When the casing pressure of the gas well decreases or is lifted to below the external output pressure using a gas lift truck, a process gas lift can be employed. This mainly utilizes one side of the backup pipeline. The valve connecting the separator to the external output pipeline is opened, allowing a portion of the externally exported gas to flow into the separator and then into the well. After the gas well is lifted and operational, production resumes from the formal production process. The casing valve on the formal production pipeline side remains closed to ensure normal gas lift drainage.

[0024] This invention can effectively reduce the gas lift costs for external contractors, making it highly economical, and can also greatly improve the safety of gas lift on site. The gas source and gas used for gas lift are all within the safe range of the equipment process, and can continuously support gas lift production at gas wells.

[0025] It should be noted that the terms "connection" and "setting" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features defined with "connection" or "setting" may explicitly or implicitly include one or more of that feature. Furthermore, the terms "connection" and "setting," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the present invention described herein can be implemented in a sequence other than those illustrated or described herein. Moreover, for the foregoing embodiments, for the sake of simplicity, they are all described as a series of actions; however, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Secondly, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions involved are not necessarily essential to this application.

[0026] The above embodiments describe the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Modifications and variations made by those skilled in the art without departing from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A gas lift device suitable for shale gas wells, characterized in that, It includes a main line and a backup line. The main line includes a compressor (1) and a first separator (2). One end of the compressor (1) is connected to the process gas pipe (4), and the other end is connected to the first separator (2). The first separator (2) is connected to the gas well (5). The backup line includes a second separator (3). One end of the second separator (3) is connected to the process gas pipe (4), and the other end is connected to the gas well (5).

2. A gas lift device suitable for shale gas wells as described in claim 1, characterized in that, The first separator (2) is connected to the gas well (5) through the main oil pipe and the main casing respectively. The main oil pipe is equipped with a main oil pipe control valve (16) and a main oil pipe connection control gate (14); the main casing is equipped with a main casing gate (15) and a main casing connection control gate (13).

3. A gas lift device suitable for shale gas wells as described in claim 2, characterized in that, A first valve (7) is provided between the process gas pipe (4) and the compressor (1), a second valve (8) is provided between the compressor (1) and the first separator (2), and a third valve (9) is provided between the first separator (2) and the gas well (5).

4. A gas lift device suitable for shale gas wells as described in claim 1, characterized in that, The second separator (3) is connected to the gas well (5) through the backup oil pipe and the backup casing pipe respectively. The backup oil pipe is equipped with a backup oil pipe control valve (17) and a backup oil pipe connection control gate (19); the backup casing pipe is equipped with a backup casing gate (18).

5. A gas lift device suitable for shale gas wells as described in claim 4, characterized in that, A fourth valve (6) is provided between the second separator (3) and the process gas pipe (4), and a first gate (12) and a second gate (20) are also provided between the second separator (3) and the gas well (5).

6. A gas lift device suitable for shale gas wells as described in claim 1, characterized in that, A fifth valve (11) and a sixth valve (10) are also provided between the main line and the backup line.

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