1
Allen Joseph C, Fontaine Marc F, Brown Alfred, Tate Jack F: Petroleum recovery process. Texaco, Whaley T H, Reis C G, July 9, 1974: US3822748 (19 worldwide citation)

A process for producing petroleum from a subterranean reservoir is provided whereby a solvent equal in density or more dense than water is circulated between upper and lower perforations in a first well in order to dissolve petroleum in an ever-widening volume around the well bore until communicatio ...


2
Christopher Jr Charles A, Grimm Henry J, Nute Alton J: Petroleum recovery process. Texaco, January 9, 1973: US3709297 (13 worldwide citation)

An improved oil recovery method is disclosed in which a slug of a dilute aqueous polymer solution is injected into a subterranean oil-containing formation through one or more injection wells followed by a slug of dilute aqueous solution of an alkali metal hypochlorite. Optionally, either or both of ...


3
Fred David Martin, Lawrence James Guilbault: Petroleum recovery process. Calgon Corporation, Rudolph J Anderson, Harry E Westlake, Martin L Katz, April 27, 1976: US03953342 (11 worldwide citation)

Use of dialdehydes to maintain or increase solution viscosity of polymer compositions useful in oil recovery processes. In particular, the dialdehydes are used to maintain or enhance the effectiveness of polymers used as viscosity increasing agents in aqueous oil displacement media in the secondary ...


4
George L Herter, Christian Herter: Recycled fatty acid crude petroleum recovery process. Stephen D Carver, November 6, 1984: US04480691 (9 worldwide citation)

A method of recovering crude oil for subsequent processing. The method contemplates the step of exposing the source of crude oil such as a subterranean petroleum reservoir or a vessel or container of tar sands, kerogen or the like to aliphatic or carboxylic acid, preferably oleic acid, to produce a ...


5
Carlin Joseph T: Viscous petroleum recovery process. Texaco, Whaley Thomas H, Ries C G, December 17, 1974: US3854531 (9 worldwide citation)

A method for recovering heavy oils and tar sand oils which involves first improving the reservoir permeability without fracturing the reservoir and subsequently flooding the reservoir with hot water or steam. The permeability is improved by establishing some permeability using water injection follow ...


6
Harbir S Chhina, Ben Nzekwu: Hydrocarbon recovery facilitated by in situ combustion utilizing horizontal well pairs. EnCana Corporation, Karl Bozicevic, Bozicevic Field & Francis, April 14, 2009: US07516789 (9 worldwide citation)

The invention provides hydrocarbon recovery processes that may be utilized in heavy oil reservoirs. Horizontal hydrocarbon production wells may be provided below horizontal oxidizing gas injection wells, with distant combustion gas production wells offset from the injection well by a distance that i ...


7
Shoichi Kanda, Gengiro Kawamura: Method for inhibiting the degradation of an aqueous solution of an acrylamide polymer in a petroleum recovery process. Nitto Chemical, Sughrue Mion Zinn Macpeak & Seas, November 6, 1984: US04481316 (7 worldwide citation)

2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.


8
Norton Charles J, Falk David O: Petroleum recovery process utilizing formaldehyde-sulfite-reacted polyacrylamide. Marathon Oil Company, September 25, 1973: US3760879 (6 worldwide citation)

Viscosity and screen factor of modified polyacrylamides for use in supplemented recovery of petroleum are increased by treatment with formaldehyde and either simultaneously or sequentially with sulfite or bisulfite to yield a high molecular weight partially hydrolyzed sulfomethylated polyacrylamide ...


9
Chhina Harbir S, Nzekwu Ben: Hydrocarbon recovery facilitated by in situ combustion utilizing horizontal well pairs. Encana Corporation, Chhina Harbir S, Nzekwu Ben, SMART Suite 2200 650 West Georgia Street Box 11560 Vancouver Centre Vancouver British Columbia V6B 4N8, July 20, 2006: WO/2006/074555 (6 worldwide citation)

The invention provides hydrocarbon recovery processes that may be utilized in heavy oil reservoirs. Horizontal hydrocarbon production wells may be provided below horizontal oxidizing gas injection wells, with distant combustion gas production wells offset from the injection well by a distance that i ...


10
Shoichi Kanda, Gengiro Kawamura: Method for stabilizing an acrylamide polymer in a petroleum recovery process. Nitto Chemical, Sughrue Mion Zinn Macpeak & Seas, July 12, 1983: US04393163 (5 worldwide citation)

2-Mercaptobenzoimidazole or its water-soluble salt is added to a water-soluble acrylamide polymer containing a predominant amount of acrylamide in the molecule to inhibit degradation, especially at high temperatures, in a petroleum recovery process.