Refrigeration – Processes – Circulating external gas
Patent
1986-07-24
1988-06-28
Capossela, Ronald C.
Refrigeration
Processes
Circulating external gas
62 37, 62 54, F25J 302
Patent
active
047536667
ABSTRACT:
A method of treating CO.sub.2 rich gas for injection into a petroleum reservoir is described. CO.sub.2 rich gas containing methane, nitrogen, ethane, propane, butanes, and heavier components is distilled such that substantially all of the heavier components are produced as a bottoms product and substantially all of the CO.sub.2, ethane, and propane are produced as an overhead vapor. The presence of ethane and propane in the overhead vapors overcomes the effect of nitrogen and methane on minimum miscibility pressure in the reservoir, and the problems created by CO.sub.2 freezing and the CO.sub.2 /ethane azeotrope are avoided, furthermore, a readily marketable liquid product is produced.
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Iakovakis Al C.
Larsen Wayne K.
Pastor Gerald R.
Peters Janet F.
Capossela Ronald C.
Chevron Research Company
Keeling E. J.
LaPaglia S. R.
Norviel V. A.
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