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Method of liquefying natural gas at casing head pressure

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1. THE METHOD OF LIQUEFYING GAS WHICH CONSISTS IN SUPPLYING IT IN GASEOUS PHASE TO A LIQUEFYING SYSTEM AT RELATIVELY HIGH PRESURE AND TEMPERATURE, COOLING IT, CAUSING THE COOLED GAS TO INITIALLY EXPAND WITHOUT DOING EXTERNAL WORK BUT WITH RESULTANT REDUCTION IN TEMPERATURE, COMBINDING THE INTIALLY EXPANDED GAS WITH STRIPPED GAS TO BE RECYCLED, COOLING THE COMBINED STREAM, CAUSING IT TO EXPAND AND DO EXTERNAL WORK WITH FURTHER REDUCTION IN TEMPERATURE AND RESULTANT LIQUEFACTION OF SOME OF THE GAS, SEPARATING THE LIQUID FROM THE GASEOUS PHASE, COMPRESSING AND COOLING THE STRIPPED GAS TO A PRESSURE SUSBTANTIALLY EQUAL TO THE PRESSURE OF THE GAS AFTER INITIAL EXPANSION, AND RECYCLING THE STRIPPED GAS TO COMBINE WITH SAID INITIAL EXPANDED GAS TO FORM SAID COMBINED STREAM.
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