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US 5,178,217 AGranted
Gas foam for improved recovery from gas condensate reservoirs
AssigneeUnion Oil Company of California
InventorsShane S. Mohammadi, John D. Collins
Life of this patent
Estimating the term…
Abstract
Gas-condensate having an API gravity value greater than 55.degree. is produced by injecting (1) a light noncondensable gas and (2) a foaming agent comprising a surfactant and water into a subterranean formation containing the gas condensate.
Claims33
A method for improving recovery of gas condensate comprising:
- injecting a composition of matter comprising a mixture of (1) a non-condensable gas and (2) a foaming agent comprising a surfactant and water into a subterranean formation containing a gas condensate;
- pressurizing the gas condensate with the injected non-condensable gas and foaming agent;
- and
- recovering the gas condensate.
1 more element
A method for creating a semi-permeable gas driving barrier for driving gas condensate through a subterranean formation to a recovery well comprising:
- injecting a barrier composition, comprising (1) a non-condensable gas at subterranean formation pressure and temperature, said gas having an API gravity value greater than 75.degree., and (2) a foaming agent, comprising water and a surfactant, down a gas condensate well;
- forcing the barrier composition out of the well into the subterranean formation, at a pressure and temperature sufficient to cause foaming of the barrier composition, said subterranean formation containing a gas condensate product;
- and
- driving at least some of the gas condensate produce through the formation.
1 more element
Dependencies are inferred from the claim text.