METHOD OF GAS UTILIZATION FROM GAS LINE-TRAINS IN PREPARATION FOR REPAIR OR IN-LINE DIAGNOSTICS Russian patent published in 2019 - IPC F17D1/04 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the field of gas industry and can be used for gas pumping during repair and preventive works on pipeline-trains and gas collectors in systems for collection of well products at gas and gas condensate fields. Method of gas recovery from gas pipeline-line in preparation for repair or in-line diagnostics, in which gas from emptying section is supplied via pipelines to complex gas treatment plant, pressure is reduced to pressure value in main gas line, characterized by that gas is introduced into gas of complex gas preparation plant and prepared for transportation by three-stage separation, in which the gas stream is fed for primary separation, methanol from the water-methanol solution is desorbed by the gas stream, methanol is fed into the gas stream, gas stream is cooled by air, hydrocarbon condensate, gas in two stages, secondary separation of gas flow is carried out, methanol is introduced into gas stream, gas flow is cooled by gas and due to pressure reduction, final separation of gas flow is performed, separated gas is separated in three steps by gas flow and gas is discharged from the plant, mixing liquid phase after primary separation of gas stream and aqueous solution after desorption of methanol, introducing therein a liquid phase after secondary separation of gas stream, directing for separation from hydrocarbon condensate of gas and aqueous solution, introducing gas into gas flow before final separation, removing aqueous solution from unit, directing liquid phase after final separation for separation into hydrocarbon condensate, gas and water-methanol solution, returning gas to repeated final separation together with gas flow, introducing water-methanol solution into gas stream, removing aqueous solution from gas stream, hydrocarbon condensate is heated by gas flow and mixed with hydrocarbon condensate after primary and secondary separation, hydrocarbon condensate is directed to separate low-pressure gas and water-methanol solution from it, low pressure gas is ejected to gas flow, hydrocarbon condensate and water-methanol solution are removed from the unit, and dried gas is removed from the plant and supplied to the main gas line.

EFFECT: main task, which solution is aimed at claimed invention, is reduction of losses of gas and gas condensate at evacuation of pipeline sections during preparation for repair, inspection or in-line diagnostics.

1 cl, 1 dwg