METHOD AND INSTALLATION FOR PREPARING GAS FOR TRANSPORT Russian patent published in 1997 - IPC

FIELD: oil and gas production. SUBSTANCE: method consists in forming gas stream, separation and withdrawal of impurities, cooling by heat exchange technics, and low-temperature separation and withdrawal of impurities. According to invention, separation of impurities is effected using laminar flow of gas stream through vertical layer of hydrocarbon liquid and low-temperature separation is effected in the same way at - 30 to -120 C. Impurities are withdrawn automatically when predetermined content of impurity in liquid layer is reached. Gas stream flows from below upwards in the form of small bubbles, and, as liquid, hydrocarbon, gas condensate with low hardening temperature is used. After low-temperature separation, gas stream is additionally subjected to centrifugal separation and then to heat-exchange heating with gas stream to be cooled after separation. Installation contains following interconnected constituents: inlet line; separator connected through locking device to impurity collector; heat exchanger; low- temperature separator connected through locking device to impurity collector; and outlet line. According to invention, before inlet line, gas collector is installed; inlet line is constructed in the form of gander; separator contains vertical column enclosing two float members, one being disposed in middle and the other in upper part of column; low-temperature separator contains heat-insulated vertical column enclosing float member and heat exchanger connected to cold- production installation in its upper part. The two vertical columns are filled with hydrocarbon liquid and each float member is automatically linked with locking device of drain line. In the lower part of separator column, hose gauze connected with inlet line is installed and, in the power part of low-temperature separator column, hose gauze connected with heat exchanger outlet is installed. installation is also supplemented with centrifugal separator, its inlet being connected to gas line and outlet to heat exchanger tube space. EFFECT: improved quality of purification and drying of gas, simplified design, and reduced usage of reagents. 8 cl, 1 dwg