Patent ID: 7673685
Filing Date: 2010-03-09
Classification: C01B,C10G,E21B

Abstract:
1. A plant for providing gas for down-hole injection for pressure support in an oil reservoir for recovery of hydrocarbons and production of oxygenated hydrocarbons or higher hydrocarbons from natural gas, comprising: an air separation unit for production of an oxygen-rich fraction for supply to processes that require oxygen and a nitrogen-rich fraction for injection; a reformer for conversion of a mixture of natural gas, water and oxygen or oxygen-enriched air from the air separation unit into a synthesis gas comprising mainly H a synthesis unit for conversion of the synthesis gas for synthesis of higher hydrocarbons comprising one or more once-through Fischer-Tropsch units for synthesis of higher hydrocarbons; means for injecting gas into the reservoir; means for transferring nitrogen from the air separation unit to the means for injecting gas; means for transferring at least a part of a waste gas from the synthesis unit to the means for injecting gas; and, a tail gas treatment unit for removing CO by a shift reaction and separation of hydrogen from the remaining tail gas; and means for introducing at least a part of the separated hydrogen from the tail gas treatment unit into a Fischer-Tropsch loop to adjust a H