METHOD FOR INJECTING GAS INTO RESERVOIR (OPTIONS) Russian patent published in 2021 - IPC E21B43/40 F25J3/08 B01D53/00 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas industry, it can be used in the development of gas condensate fields and for the utilization of petroleum associated gases. Methods for injecting gas into the reservoir are stated. The method for injecting gas into the reservoir involves the separation of hydrocarbon condensate from the extracted gas to obtain separated gas and separation of the separated gas into two gas streams. Treatment of the first gas stream is conducted in a low-temperature condensation plant, in which the first gas stream is cooled in heat exchangers to form a liquid phase separated in a separator. The resulting gas phase is expanded in the turbine of the turbo-expander unit. The second gas stream is compressed in the compressor of the turbo-expander unit to a pressure of at least 100 atm and sent to the injection wells for injection into the reservoir. It is also possible to implement a method for injecting gas into the reservoir, when the separated gas is sent to a low-temperature condensation unit. The separated gas is cooled in heat exchangers to form a liquid phase, which is separated in a separator. The resulting gas phase is divided into two gas streams. The first gas stream is expanded in the turbine of the turbo-expander unit. The second gas stream is compressed in the compressor of the turbo-expander unit to a pressure of at least 100 atm and sent to the injection wells for injection into the reservoir. It is also possible to implement the method for gas injection into the reservoir. The method includes the processes of separation of hydrocarbon condensate from the produced gas of the first group of wells and from the produced gas of the second group of wells, to obtain a separated first gas stream of the first group of wells and a separated second gas stream of the second group of wells. Treatment of the separated first gas stream of the first group of wells is conducted in a low-temperature condensation unit, in which the separated first gas stream of the first group of wells is cooled in heat exchangers to form a liquid phase separated in separators. The resulting gas phase is expanded in the turbine of the turbo-expander unit. The separated second gas stream of the second group of wells is compressed in the compressor of the turbo-expander unit to a pressure of at least 100 atm and sent to the injection wells for injection into the reservoir.

EFFECT: increased efficiency of injecting gas obtained after processing the extracted gas, due to the use of the energy of the extracted gas.

8 cl, 3 dwg