Steven D Mcpherson

US Patent:

55159192, May 14, 1996

Filed:

Jul 1, 1994

Appl. No.:

8/269581

Inventors:

Chris E. Stevens - Orchard Point, SG
Steven D. McPherson - Rangely CO
John R. Larson - Orchard Point, SG
Donnell R. Robie - Rangely CO
Ronald K. Wackowski - Vernal UT

Assignee:

Chevron U.S.A Inc. - San Francisco CA

International Classification:

E21B 4322

US Classification:

166273

Abstract:

An enhanced oil recovery process comprises of the at least periodic introduction of (i) a non-condensible gas preferably selected from among carbon dioxide, nitrogen, methane or mixtures thereof, and (ii) an aqueous drive solution, preferably brine, into a reservoir formation. In this process, the half cycle of non-condensible gas injection, prior to aqueous drive fluid injection, measured in hydrocarbon pore volume is less than 0. 25%. In this preferred embodiment, the non-condensible gas, e. g. , carbon dioxide, and water, are simultaneously injected into the formation.

US Patent:

56345208, Jun 3, 1997

Filed:

May 8, 1996

Appl. No.:

8/646888

Inventors:

Chris E. Stevens - Orchard Point, SG
Steven D. McPherson - Rangely CO
John R. Larson - Orchard Point, SG
Donnell R. Robie - Rangely CO
Ronald K. Wackowski - Vernal UT

Assignee:

Chevron U.S.A. Inc. - San Francisco CA

International Classification:

E21B 4322

US Classification:

166402

Abstract:

An enhanced oil recovery process comprises of the at least periodic introduction of (i) a non-condensible gas preferably selected from among carbon dioxide, nitrogen, methane or mixtures thereof, and (ii) an aqueous drive solution, preferably brine, into a reservoir formation. In this process, the half cycle of non-condensible gas injection, prior to aqueous drive fluid injection, measured in hydrocarbon pore volume is less than 0. 25%. In this preferred embodiment, the non-condensible gas, e. g. , carbon dioxide, and water, are simultaneously injected into the formation.