METHOD FOR PRODUCTION OF LOW-PRESSURE GAS Russian patent published in 2021 - IPC E21B43/00 

FIELD: gas production industry.

SUBSTANCE: invention relates to the gas production industry, namely to the introduction into industrial operation of gas wells in conditions of low reservoir pressures for the extraction of residual natural gas reserves. Disclosed is a method for production of low-pressure gas, presupposing continuation of the development of gas deposits. In this case, after the end of the industrial use of the well, when the reservoir pressure drops to 22 atm, the operation of gas wells is completed, the valves of the surface equipment of the wells are closed sequentially along the direction of gas flow, starting with the one closest to its source. Then, the feasibility of further operation of the wells is determined. For this, according to geological data, the natural gas reserves in each well are calculated. In order to determine the percentage of gas in the total volume, control gas sampling is carried out for water saturation and external impurities. The flow rate of each well is calculated. The serviceability of the equipment at each well and the operability of metering and control devices and shut-off tree valves are checked. After a positive decision to put the well into operation, the valves of the surface equipment of the well are opened sequentially in the direction of gas flow, starting with the one closest to its source. In this case, the low-pressure gas by means of the residual formation pressure is sent to the separator to the complex gas treatment unit, where the dropping liquid, formed condensate and mechanical impurities are separated. After that, the gas is fed to the absorption dehydration, where heated to +180-200°С, it enters from the bottom up through the absorber, where water and heavy hydrocarbons are desorbed. The gas is then sent to the existing gas pipelines, through which it is directly supplied to the gas processing facilities located in the production area.

EFFECT: increasing the extraction of low-pressure gas while ensuring fire-prevention and anti-gushing safety of the technological process.

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