System for separating carbon dioxide from a produced gas...

Details System for separating carbon dioxide from a produced gas... System for separating carbon dioxide from a produced gas...

2008-08-22

2010-10-05

Lawrence, Frank M (Department: 1797)

Gas separation: processes

Liquid contacting

And recycle or reuse of contact liquid for further contact

C095S236000, C095S237000, C095S228000, C095S229000, C062S606000, C062S611000, C062S617000, C062S618000, C062S619000, C062S632000, C062S633000, C062S625000, C208S308000, C208S311000

Reexamination Certificate

active

07806965

ABSTRACT:
Produced natural gas containing carbon dioxide is dehydrated and chilled to liquefy the carbon dioxide and then fractionated to produce a waste stream of liquid carbon dioxide and hydrogen sulfide. Natural gas liquids may be first separated and removed before fractionation. After fractionation, the waste stream is pressurized and transmitted to a remote injection well for injection either for disposal of the waste stream and preferably to urge hydrocarbons toward the producing well. A hydrocarbon stream proceeds from fractionation to a methanol absorber system which removes carbon dioxide gas. The hydrocarbon stream is thereafter separated into at least hydrocarbon gas, nitrogen and helium. Some of the nitrogen is reintroduced into a fractionation tower to enhance the recovery of hydrocarbons. A methanol recovery system is provided to recover and reuse the methanol. The hydrocarbons are sold as natural gas and the helium is recovered and sold. Excess nitrogen is vented.

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