CN-121993125-A - Negative pressure and supercharging cooperative gas lift drainage gas production method and device

CN121993125ACN 121993125 ACN121993125 ACN 121993125ACN-121993125-A

Abstract

The invention belongs to the technical field of oilfield drainage gas production, and discloses a negative pressure and pressurization cooperative gas lift drainage gas production method and device, which are used for solving the technical problem of low gas production efficiency of drainage gas production technology in the prior art. The method comprises the steps of S1, pressurizing gas lift, S2, negative pressure suction, wherein mixed fluid is lifted to the ground in cooperation with the pressurizing gas lift, S3, gas-liquid separation is carried out on the mixed fluid, S4, intelligent control and optimization are carried out, in the execution process of the steps S1, S2 and S3, production data of a gas well are collected in real time through an RTU control system, the current working condition of the gas well is identified, a matched operation mode is automatically decided and selected, gas injection parameters and suction parameters are dynamically optimized in the cooperative mode of the pressurizing gas lift and the negative pressure suction, and cooperative operation of the pressurizing gas lift and the negative pressure gas production is controlled. The RTU control system controls the negative pressure and the pressurization to generate a synergistic effect, so that the bottom hole flow pressure is reduced, the liquid carrying capacity is improved, and the gas production efficiency is improved.

Inventors

LIU BOYU
LAI FENGPENG
JIANG TAO
ZHAO RU
LIAO YONGKANG
ZHANG HAO
SHI CHENYI
LIU ZHICHAO

Assignees

中国地质大学（北京）

Dates

Publication Date: 20260508
Application Date: 20260330

Claims (10)

1. The negative pressure and pressurization cooperative gas lift drainage gas production method is characterized by comprising the following steps of: S1, pressurizing gas lift, namely pressurizing purified gas to a preset pressure through a pressurizing compressor (3) to form high-pressure gas; s2, negative pressure suction, namely carrying out negative pressure suction on the oil pipe through negative pressure gas production and mixed transportation pressurizing equipment (4), and lifting mixed fluid in the oil pipe to the ground in cooperation with the pressurizing gas lift; s3, mixed fluid treatment, namely carrying out gas-liquid separation on the mixed fluid lifted to the ground, and carrying out external transportation on the separated natural gas after treatment; And S4, intelligent control and optimization, namely acquiring production data of the gas well in real time through an RTU control system in the execution process of the steps S1, S2 and S3, identifying the current working condition of the gas well, automatically deciding and selecting a matched operation mode, dynamically optimizing gas injection parameters and suction parameters in a cooperative mode of pressurizing gas lift and negative pressure suction, and controlling cooperative operation of pressurizing gas lift and negative pressure gas production.
2. The method and device for gas lift drainage and gas production by combining negative pressure and pressurization according to claim 1, wherein the production data at least comprise oil pressure P Oil (oil) , casing pressure P Cover and gas production Q, and the current working conditions of the gas well specifically comprise: calculating oil jacket pressure difference delta P= |P Cover -P Oil (oil) |; judging the productivity state of the gas well according to the variation trend of the gas production amount Q, which comprises the following steps: When the oil jacket pressure difference delta P is continuously increased and the gas yield Q is continuously reduced, the hydrops is identified as serious; When the oil sleeve pressure difference delta P is stable within a preset range and the gas production quantity Q is stable, identifying that the production is stable; When the casing pressure P casing continues to rise and the gas production Q increases, formation energy recovery is identified.
3. The method for gas lift drainage and gas production by combining negative pressure with pressurization according to claim 2, wherein the automatically deciding and selecting the matched operation mode in step S4 specifically comprises: when the severe hydrops working condition is identified, selecting a pressurizing gas lift or negative pressure suction for enhancing the gas injection amount to cooperate with the pressurizing gas lift; when the production stable working condition is identified, negative pressure suction and pressurization gas lift are selected to cooperate, and parameters are optimized to an economic running state; And selecting negative pressure suction when the stratum energy recovery working condition is identified.
4. The gas lift drainage and gas production method with the cooperation of negative pressure and pressurization according to claim 3, wherein when the operation mode needs to be switched, the RTU control system adopts a progressive parameter adjustment strategy to ensure the safety and stability of the switching process.
5. The negative pressure and pressurization collaborative gas lift drainage and gas production method according to claim 1, wherein the RTU control system is based on a wellbore multiphase flow model and a wellbore productivity model, controls switching of an operation mode by combining real-time production data, and calculates optimal gas injection and suction pressure values in real time through an intelligent algorithm.
6. The negative pressure and pressurization collaborative gas lift drainage gas production method according to claim 1, characterized in that in the step S3, a part of separated natural gas is delivered to a gas generator (6) as fuel; and the power generated by the gas generator (6) is supplied to the booster compressor (3), the negative pressure gas production and mixed transportation booster equipment (4) and the RTU control system.
7. A drainage and gas production device for carrying out the method of any one of claims 1-6, comprising: A skid-mounted base (1); a gas source (2) for providing a gas; The booster compressor (3) is arranged on the skid-mounted base (1), an inlet of the booster compressor (3) is communicated with the air source (2), and an outlet of the booster compressor (3) is communicated with an oil sleeve annulus of the gas well; the negative pressure gas production and mixed transportation pressurizing equipment (4) is arranged on the skid-mounted base (1), and an inlet of the negative pressure gas production and mixed transportation pressurizing equipment (4) is communicated with an oil pipe in the gas well; The separator (5) is communicated with the outlet of the negative pressure gas production and mixed transportation pressurizing equipment (4), and the separator (5) is used for carrying out gas-liquid separation on the mixed fluid produced in the gas well; The gas generator (6) is arranged on the skid-mounted base (1) and is electrically connected with the booster compressor (3) and the negative pressure gas production and mixed transportation booster equipment (4), and the gas generator (6) is used for providing electric power; The monitoring module is arranged on the wellhead of the gas well and the pipeline and is used for collecting real-time production data of the gas well; And the RTU control cabinet (7) is electrically connected with the booster compressor (3), the negative pressure gas production and mixed transportation booster equipment (4) and the monitoring module.
8. The drainage and gas production device of claim 7 wherein the monitoring module comprises: The pressure sensor is arranged at the wellhead of the gas well; the temperature sensor is arranged at the wellhead of the gas well; A flowmeter arranged on the pipeline; The pressure regulating valve is arranged on the pipeline, and the pressure sensor, the temperature sensor, the flowmeter and the pressure regulating valve are all electrically connected with the RTU control cabinet (7).
9. The drainage and gas production device according to claim 8, characterized in that the gas source (2) comprises any one or more of a first gas recovered from the separator (5), a second gas provided by a gas well and a third gas provided by a mobile nitrogen production device.
10. The water and gas extraction device according to claim 7, further comprising four moving wheels (8), wherein the four moving wheels (8) are rotatably mounted on the skid-mounted base (1) and are positioned at four vertexes of the same rectangle.

Description

Negative pressure and supercharging cooperative gas lift drainage gas production method and device Technical Field The invention belongs to the technical field of oilfield drainage and gas production, and particularly relates to a negative pressure and pressurization collaborative gas lift drainage and gas production method and device. Background Natural gas has become the dominant source of clean energy in the 21 st century world, and the demand for natural gas in China is also growing rapidly. The method is used for efficiently exploiting natural gas under the conditions of safety and environmental protection, and greatly improving the recovery ratio of the natural gas, and is a target for oil-gas field development. As gas wells produce, the pressure in the formation may gradually decrease. When the pressure is reduced to a certain level, water in the formation may begin to invade the wellbore, occupy the wellbore space, and impede the flow of natural gas. In order to effectively maintain the productivity of the gas well, improve the recovery ratio, ensure the normal production of the gas well and prolong the economic life of the gas well, drainage and gas production are required by certain measures. Negative pressure gas production and pressurized gas lift are two traditional drainage gas production processes. The negative pressure gas production reduces the pressure of an oil pipe through a negative pressure compressor and increases the production pressure difference, but the problem that serious effusion is difficult to treat and is easily influenced by ground pressure collection exists in application, so that liquid carrying discontinuity is caused. The pressurized gas lift reduces the fluid density of the shaft by injecting high-pressure gas into the oil sleeve annulus, but has high gas injection pressure, large friction resistance and remarkable energy consumption when in use, and particularly has low lifting efficiency in low-pressure stratum. Disclosure of Invention The invention aims to overcome the defects in the prior art, and provides a negative pressure and pressurization cooperative gas lift drainage gas production method and device, so as to solve the technical problem of low gas production efficiency of a drainage gas production process in the prior art. In order to achieve the above purpose, the invention adopts the following technical scheme: a negative pressure and pressurization cooperative gas lift drainage gas production method comprises the following steps: S1, pressurizing gas lift, namely pressurizing purified gas to a preset pressure through a pressurizing compressor to form high-pressure gas; S2, negative pressure suction is carried out on the oil pipe through negative pressure gas production and mixed transportation pressurizing equipment, and meanwhile, mixed fluid in the oil pipe is lifted to the ground in cooperation with the pressurizing gas lift; s3, mixed fluid treatment, namely carrying out gas-liquid separation on the mixed fluid lifted to the ground, and carrying out external transportation on the separated natural gas after treatment; And S4, intelligent control and optimization, namely acquiring production data of the gas well in real time through an RTU control system in the execution process of the steps S1, S2 and S3, identifying the current working condition of the gas well, automatically deciding and selecting a matched operation mode, dynamically optimizing gas injection parameters and suction parameters in a cooperative mode of pressurizing gas lift and negative pressure suction, and controlling cooperative operation of pressurizing gas lift and negative pressure gas production. Further, the production data at least comprise oil pressure P Oil (oil) , casing pressure P Cover and gas yield Q, and the current working conditions of the gas well specifically comprise: calculating oil jacket pressure difference delta P= |P Cover -P Oil (oil) |; judging the productivity state of the gas well according to the variation trend of the gas production amount Q, which comprises the following steps: When the oil jacket pressure difference delta P is continuously increased and the gas yield Q is continuously reduced, the hydrops is identified as serious; When the oil sleeve pressure difference delta P is stable within a preset range and the gas production quantity Q is stable, identifying that the production is stable; When the casing pressure P casing continues to rise and the gas production Q increases, formation energy recovery is identified. Further, the automatically deciding and selecting the matched operation mode in step S4 specifically includes: when the severe hydrops working condition is identified, selecting a pressurizing gas lift or negative pressure suction for enhancing the gas injection amount to cooperate with the pressurizing gas lift; when the production stable working condition is identified, negative pressure suction and pressurization gas lift are