METHOD FOR AUTOMATIC SUPPORT OF THE TEMPERATURE MODE OF TECHNOLOGICAL PROCESSES OF THE INSTALLATION OF LOW-TEMPERATURE GAS SEPARATION UNDER THE FAR NORTH CONDITIONS Russian patent published in 2019 - IPC F17D5/00 

FIELD: gas industry.

SUBSTANCE: invention relates to the field of production and preparation of gas and gas condensate for long-distance transport. Method provides supplying a gas-liquid mixture from the separator outlet of the first stage of reduction to the air-cooling unit input and lowering the temperature of the mixture to the specified values of temperature in low-temperature separator. Then cooled mixture is divided into two streams and served for additional cooling through the pipeline to the inlet of the first section of the regenerative heat exchanger "gas-gas" and to the input of the first section of the gas-condensate heat recovery exchanger through the gas-liquid mixture flow control valve. At the same time (computerized control system of technological processes) regulates the flow of gas-liquid mixture passing through the heat exchanger, ensuring maintenance of the set temperature of petroleum play. Then gas-liquid mixture flows from the outlets of the first sections of heat recovery exchangers are combined and through the valve-regulator, which acts as a controlled reducer, enters a low-temperature gas separator equipped with a temperature sensor. As a result of reduction, temperature of the mixture drops to the required value, which is maintained by computerized control system of technological processes by regulating with the help of PID-regulators and a controlled gearbox. In the low-temperature separator, final separation of the gas-liquid mixture into dry cold gas and mixture (petroleum play with admixture of VRI) occurs, which are fed to the input of the second section of gas-condensate heat recovery exchanger and further to the liquid separator, in which petroleum play and VRI are separated, as well as weathering gas. Petroleum play by means of the pump unit moves in MCP. Separated VRI is sent to the plant for the regeneration of the inhibitor of the CGTP. Cold gas released from the low-temperature separator is divided into two streams, one of which is fed to the input of the second section of the gas-to-gas heat recovery exchanger, and the second – to the bypass of this section, equipped with a gas flow control valve. Computerized control system of technological processes, using a gas flow control valve, changes the ratio of the gas flows passing through the heat recovery exchanger and the bypass, providing a real-time correction of the gas temperature required for supplying it to subsurface piston pressure gauge.

EFFECT: inventive method allows to maintain a given temperature mode of the technological processes of the installation, ensuring its effective operation; to control and maintain the required temperature of dry gas and NGK, in order to protect permafrost soils from defrosting during the underground laying of gas pipelines in the Far North.

7 cl, 2 dwg