Multi-well linkage gas lift system and control system

Abstract

The invention discloses a multi-well linkage gas lift system and a control system.The multi-well linkage gas lift system comprises a compressor, a gas storage tank and a plurality of gas wells connected in parallel, gas is conveyed to the compressor through a gas feeding pipeline, is compressed by the compressor and then is conveyed into the gas storage tank, and the gas wells are connected in parallel; gas in the gas storage tank is transmitted into a plurality of gas wells through the gas lift adjusting valve and then transmitted out through the gas transmission pipeline, and gas lift is achieved. The control system comprises a gas lift quantity module, a gas production quantity module, a display module, an integrating module, an input module, an opening module and a pressure module, and is used for displaying real-time instantaneous gas production quantity, daily cumulative gas production quantity, gas lift pressure, wellhead pressure, instantaneous gas lift quantity, daily cumulative gas lift quantity and the like of each gas well. And the opening degree of each gas lift adjusting valve is adjusted based on the real-time data and the set data, so that the gas injection amount is controlled, and stable production of the gas well is achieved.

Description

Technical Field

[0001] The invention relates to a multi-well linkage gas lift system and a control system, belonging to the technical field of natural gas lift. Background Art

[0002] At the end of gas well production / during the entire production process of shallow and ultra-shallow shale gas wells, water comes out from the bottom of the gas well, causing the gas well energy to be unable to break through the water layer and the gas well to stop production. At present, gas lift is mainly used for production at the end of gas well production. The principle is to inject natural gas into the gas well by tubing / casing (positive lift / reverse lift of the gas well), increase the gas flow rate in the wellbore, carry the accumulated liquid to the wellhead, and achieve stable production of the gas well. During the gas lift process, the gas well operator needs to rely on experience to adjust the gas lift injection volume in real time on site. In this way, due to the limitation of the operator, the injection gas volume is uncertain, resulting in discontinuous production of the gas well, affecting the continuous and stable production of the gas well. Summary of the invention

[0003] The purpose of the present invention is to provide a multi-well linkage gas lift system and control system, which can accurately calculate the gas lift pressure and injected gas volume of the gas wells and achieve the purpose of intelligent and precise control of gas lift.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows: The present invention provides a multi-well linkage gas lift system, comprising a compressor, a gas storage tank and at least one gas well; The incoming gas pipeline is connected to the compressor and the gas storage tank in sequence; At least one of the gas wells is connected in parallel and is connected to the gas storage tank; The gas wells are connected to the gas pipeline, and a gas well flow meter is provided at the connection between each gas well and the gas pipeline; A gas lift flow meter, a gas lift regulating valve and a gas lift pressure gauge are provided on the connecting pipeline between each gas well and the gas storage tank; The gas lift flow meter is used to detect the instantaneous gas lift volume and the cumulative gas lift volume; The gas lift regulating valve is used to control the amount of gas injection; The gas lift pressure gauge is used to detect the gas lift pressure of the injection gas well; Gas well flowmeter is used to detect the instantaneous gas production and cumulative gas production of the gas well.

[0005] Furthermore, the gas lift flow meter and the gas lift pressure gauge are respectively connected to two sides of the gas lift regulating valve.

[0006] Furthermore, a check valve is provided between the gas lift regulating valve and the gas lift pressure gauge.

[0007] Furthermore, a gas storage tank pressure gauge is provided above the gas storage tank.

[0008] Furthermore, a gas well pressure gauge is provided at the upper end of the gas well; The gas well pressure gauge is used to detect the wellhead pressure.

[0009] The present invention also provides a multi-well linkage gas lift control system, which is used to control the aforementioned multi-well linkage gas lift system, and the control system comprises: A gas lift volume module, used to obtain the instantaneous gas lift volume and the cumulative gas lift volume of the gas well from the gas lift flowmeter of each gas well in the multi-well linkage gas lift system, and send them to the integration module and the display module; A gas production module, used to obtain the instantaneous gas production and cumulative gas production of the gas well from the gas well flowmeter of each gas well in the multi-well linkage gas lift system, and send them to the integration module and the display module; An input module, connected to the accumulation module, is used to set the required gas production, required gas lift gas volume and gas volume ratio of each gas well in the multi-well linkage gas lift system; the gas volume ratio is the ratio of gas production to gas lift gas volume; The integration module is connected with the gas lift module, the gas production module, the input module and the aperture module, and is used to obtain the instantaneous gas production, cumulative gas production, single well oil pressure, casing pressure and downhole pressure data of a single well, integrate the gas lift volume actually required for a single well and the instantaneous gas lift flow rate of a single well, and send them to the aperture module; An opening module, used for controlling the opening of the corresponding gas lift regulating valve in the multi-well linkage gas lift system based on the calculated single-well gas lift instantaneous flow rate; A pressure module, connected to the opening module and the display module, and used to set the maximum production pressure at the wellhead of each gas well during gas lift operation; The display module is connected to the gas lift module, the gas production module and the pressure module, and is used to display the instantaneous gas production, the cumulative gas production, the instantaneous gas lift volume, the cumulative gas lift volume, the gas volume ratio and the maximum production pressure of each gas well in real time.

[0010] Furthermore, the opening module is also used to: Based on the highest production pressure of the wellhead during gas lift operation set by the pressure module, the maximum reliable opening of the corresponding gas lift regulating valve is determined, and the opening of the gas lift regulating valve is controlled within the maximum reliable opening range.

[0011] Furthermore, the display module is also connected to the gas lift pressure gauge and the gas well pressure gauge of each gas well in the multi-well linkage gas lift system, and is used to display the real-time gas lift pressure and wellhead pressure of each gas well.

[0012] Furthermore, the display module is a local display module or a remote display module.

[0013] The beneficial effects of the present invention are: The present invention provides a multi-well linkage gas lift control system, which effectively solves the problems in the prior art that the gas well production is discontinuous due to the limitation of operators, the injection gas volume is uncertain, the continuous and stable production of the gas well is affected, and each cluster gas well needs operators to control the gas lift volume according to the wellhead pressure, which results in a large workload and poorer operation reliability and stability. The system can accurately calculate the gas lift pressure and injection gas volume of the gas well, and achieve the purpose of intelligent and fine control of gas lift through the cooperation of various intelligent modules and hardware equipment, and finally realize an intelligent control system with remote calculation and automatic control of on-site adjustment.

[0014] Through the control system of artificially setting fixed quantity or automatically identifying and processing feedback mechanism, the remote intelligent control production mode of multi-well linkage gas lift intelligent control system is realized. At present, the system has been promoted and applied on 6 platforms, involving a total of 18 wells, using one machine and multiple lift skids to assist gas lift production, with a total gas production of 69.951 million cubic meters, which can realize remote monitoring and intelligent adjustment of gas lift valve opening, realize intelligent and refined gas lift, and achieve stable production of gas wells. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A multi-well linkage gas lift control system architecture provided by the present invention; Figure 2 A schematic diagram of a multi-well linkage gas lift system provided by the present invention; Figure 2 Among them, 1. gas pipeline, 2. compressor, 3. gas storage tank, 4. gas storage tank pressure gauge, 5. gas lift flow meter, 6. gas lift regulating valve, 7. gas lift pressure gauge, 8. gas well pressure gauge, 9. gas well flow meter, 10. gas well, 11. check valve. DETAILED DESCRIPTION

[0016] The present invention is further described below. The following examples are only used to more clearly illustrate the technical solution of the present invention, and are not intended to limit the protection scope of the present invention.

[0017] The present invention first provides a multi-well linkage gas lift system. Figure 2 , including: a gas pipeline 1, a compressor 2, a gas storage tank 3, a gas storage tank pressure gauge 4, a gas lift flow meter 5, a gas lift regulating valve 6, a gas lift pressure gauge 7, a gas well pressure gauge 8, a gas well flow meter 9, multiple gas wells 10, a check valve 11 and a gas transmission pipeline.

[0018] Specifically, the gas pipeline 1 is connected to the compressor 2 and the gas storage tank 3 in sequence, and the gas storage tank is connected to multiple gas wells at the same time, and supplies gas to multiple gas wells 10 at the same time.

[0019] A gas lift flow meter 5, a gas lift regulating valve 6 and a gas lift pressure gauge 7 are provided on the connecting pipeline between each gas well 10 and the gas storage tank 3. The gas lift flow meter 5 and the gas lift pressure gauge 7 are connected to both sides of the gas lift regulating valve 6 respectively.

[0020] A check valve 11 is also provided between the gas lift regulating valve 6 and the gas lift pressure gauge 7 .

[0021] The gas lift flow meter 5 is used to detect the instantaneous gas lift volume and the accumulated gas lift volume; The gas lift regulating valve 6 is used to control the gas injection volume; The gas lift pressure gauge 7 is used to detect the gas lift pressure of the injection gas well; The gas well is connected to the gas pipeline, and a gas well flow meter 9 is provided at the connection between each gas well and the gas pipeline; The gas well flow meter 9 is used to detect the instantaneous gas production and cumulative gas production of the gas well.

[0022] It should be noted that a gas storage tank pressure gauge 4 is provided above the gas storage tank 3. A gas well pressure gauge 8 is provided at the upper end of the gas well 10.

[0023] The gas well pressure gauge 8 is used to detect the wellhead pressure.

[0024] During operation, the gas is transported to the compressor through the gas pipeline, compressed by the compressor and then transmitted to the gas storage tank. The gas in the gas storage tank is transmitted to multiple gas wells through the gas lift regulating valve and then transmitted out through the gas pipeline.

[0025] For the above multi-well linkage gas lift system, the present invention provides a multi-well linkage gas lift control system, see Figure 1 , including: gas lift module, gas production module, display module, integration module, input module, opening module and pressure module.

[0026] The gas lift volume module is used to obtain the instantaneous gas lift volume and the cumulative gas lift volume of the gas well from the gas lift flowmeter of each gas well in the multi-well linkage gas lift system, send it to the integration module, and send it to the display module for display; The gas production module is used to obtain the instantaneous gas production and cumulative gas production of the gas well from the gas well flow meter of each gas well in the multi-well linkage gas lift system, send it to the integration module, and send it to the display module for display; The input module is connected to the accumulation module and is used to set the required gas production, required gas lift and gas volume ratio of each gas well. The gas volume ratio is the ratio of gas production to gas lift volume; The integration module is connected with the gas lift module, gas production module, input module and aperture module, and is used to obtain the instantaneous gas production, cumulative gas production, single well oil pressure, casing pressure and downhole pressure gauge data of a single well, integrate the instantaneous gas lift flow of a single well and send it to the aperture module; The opening module is used to control the opening of the gas lift regulating valve in the multi-well linkage gas lift system based on the calculated single-well gas lift instantaneous flow rate; The pressure module is connected to the opening module and the display module, and is used to set the maximum production pressure at the wellhead of each gas well during gas lift operation, and send the maximum production pressure value to the display module for display, and limit the maximum reliable opening of the gas lift regulating valve based on the maximum production pressure. Based on the maximum production pressure, the entire system is controlled within a reasonable pressure range. When the wellhead pressure exceeds the set maximum production pressure, the opening module cannot increase the opening of the gas lift regulating valve again.

[0027] The display module is connected with the gas lift module, the gas production module and the pressure module, and is used to display the instantaneous gas production, the cumulative gas production, the gas volume ratio and the maximum production pressure of each gas well in real time.

[0028] It should be noted that the display module is also connected to the gas lift flowmeter, gas lift pressure gauge, gas well pressure gauge, and gas well flowmeter of the multi-well linkage gas lift system, and is used to display the real-time instantaneous gas production, daily cumulative gas production, gas lift pressure, wellhead pressure, instantaneous gas lift volume, and daily cumulative gas lift volume of each gas well.

[0029] It should be noted that the display module can be a local display module or a remote display module.

[0030] Gas well process setting: according to the number of gas wells on the platform, set the corresponding number of gas lift rows, equipment gas lift flowmeter 5, gas lift regulating valve 6, gas lift pressure gauge 7, gas well pressure gauge 8, gas well flowmeter 9, and all components adopt electronic control system, which can obtain corresponding parameters remotely in real time.

[0031] The actual gas lift volume required for a single well is calculated based on the instantaneous gas production and cumulative gas production of the gas well flowmeter 9 and the instantaneous gas production and cumulative gas production of the gas lift flowmeter 5, the single well oil pressure, casing pressure and downhole pressure gauge data.

[0032] According to the gas lift volume required by the gas well 10, it can be set higher in the initial stage, and then gradually adjusted down to the gas lift volume required by the single well after the lift is completed. The gas lift regulating valve opening can also be set manually locally / remotely to ensure that the gas lift volume produced by a single gas well 10 is within the control range.

[0033] The above description is only a preferred embodiment of the present invention. It should be understood that the present invention is not limited to the form disclosed in the present invention, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described in the present invention through the above teachings or the technology or knowledge in the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the present invention, and should be within the scope of protection of the claims attached to the present invention.

Claims

1. A multi-well linkage gas lift system, characterized in that: including a compressor, a gas storage tank and at least one gas well; The incoming gas pipeline is connected to the compressor and the gas storage tank in sequence; At least one of the gas wells is connected in parallel and is connected to the gas storage tank; The gas wells are connected to the gas pipeline, and a gas well flow meter is provided at the connection between each gas well and the gas pipeline; A gas lift flow meter, a gas lift regulating valve and a gas lift pressure gauge are provided on the connecting pipeline between each gas well and the gas storage tank; The gas lift flow meter is used to detect the instantaneous gas lift volume and the cumulative gas lift volume; The gas lift regulating valve is used to control the amount of gas injection; The gas lift pressure gauge is used to detect the gas lift pressure of the injection gas well; Gas well flowmeter is used to detect the instantaneous gas production and cumulative gas production of the gas well.

2. A multi-well linkage gas lift system according to claim 1, characterized in that: The gas lift flow meter and the gas lift pressure gauge are respectively connected to two sides of the gas lift regulating valve.

3. A multi-well linkage gas lift system according to claim 2, characterized in that: A check valve is also provided between the gas lift regulating valve and the gas lift pressure gauge.

4. A multi-well linkage gas lift system according to claim 1, characterized in that: A gas storage tank pressure gauge is arranged above the gas storage tank.

5. The multi-well linkage gas lift system according to claim 1, characterized in that: A gas well pressure gauge is provided at the upper end of the gas well; The gas well pressure gauge is used to detect the wellhead pressure.

6. A multi-well linkage gas lift control system, characterized in that: Used to control a multi-well linkage gas lift system according to any one of claims 1 to 5, the control system comprising: A gas lift volume module, used to obtain the instantaneous gas lift volume and the cumulative gas lift volume of the gas well from the gas lift flowmeter of each gas well in the multi-well linkage gas lift system, and send them to the integration module and the display module; A gas production module, used to obtain the instantaneous gas production and cumulative gas production of the gas well from the gas well flowmeter of each gas well in the multi-well linkage gas lift system, and send them to the integration module and the display module; An input module, connected to the accumulation module, is used to set the required gas production, required gas lift gas volume and gas volume ratio of each gas well in the multi-well linkage gas lift system; the gas volume ratio is the ratio of gas production to gas lift gas volume; The integration module is connected with the gas lift module, the gas production module, the input module and the aperture module, and is used to obtain the instantaneous gas production, cumulative gas production, single well oil pressure, casing pressure and downhole pressure data of a single well, integrate the gas lift volume actually required for a single well and the instantaneous gas lift flow rate of a single well, and send them to the aperture module; An opening module, used for controlling the opening of the corresponding gas lift regulating valve in the multi-well linkage gas lift system based on the calculated single-well gas lift instantaneous flow rate; A pressure module, connected to the opening module and the display module, and used to set the maximum production pressure at the wellhead of each gas well during gas lift operation; The display module is connected to the gas lift module, the gas production module and the pressure module, and is used to display the instantaneous gas production, the cumulative gas production, the instantaneous gas lift volume, the cumulative gas lift volume, the gas volume ratio and the maximum production pressure of each gas well in real time.

7. A multi-well linkage gas lift control system according to claim 6, characterized in that: The opening module is also used to: Based on the highest production pressure of the wellhead during gas lift operation set by the pressure module, the maximum reliable opening of the corresponding gas lift regulating valve is determined, and the opening of the gas lift regulating valve is controlled within the maximum reliable opening range.

8. A multi-well linkage gas lift control system according to claim 6, characterized in that: The display module is also connected to the gas lift pressure gauge and the gas well pressure gauge of each gas well in the multi-well linkage gas lift system, and is used to display the real-time gas lift pressure and wellhead pressure of each gas well.

9. A multi-well linkage gas lift control system according to claim 6, characterized in that: The display module is a local display module or a remote display module.

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