1
Jay P Nielson: Recovery of oil from oil-bearing formation by continually flowing pressurized heated gas through channel alongside matrix. Philip A Mallinckrodt, Robert R Mallinckrodt, August 15, 1989: US04856587 (259 worldwide citation)

The invention comprises a method and apparatus for recovering oil from so-called depleted oil fields and also from tar sands. A pressurized, heated, non-aqueous gas, such as carbon dioxide, is continuously flowed through a channel which is in heat exchange relationship with an oil-bearing matrix, th ...


2
Aleksy Sacuta: Enhanced oil recovery using electrical means. Alberta Research Council, Ernest Peter Johnson, October 21, 1980: US04228854 (239 worldwide citation)

A process is provided for recovery of oil from an oil and water bearing formation wherein spaced injection and production wells penetrate the formation and a drive fluid is injected through the injection well into the formation. A unidirectional electrical potential gradient is maintained between an ...


3
Bruce W Davis: In situ chemical stimulation of diatomite formations. Chevron Research Company, S R La Paglia, E J Keeling, V A Norviel, May 9, 1989: US04828031 (230 worldwide citation)

An improved method of recovering oil from diatomite is described. A solvent is injected into the diatomite followed by an aqueous surface active solution. The aqueous surface active solution contains a diatomite/oil water wettability improving agent and an oil/water surface tension lowering agent. T ...


4
Steven R Erbstoesser, Claude E Cooke Jr, Richard G Sinclair, Michael M Epstein: Method for reducing the permeability of subterranean formations. Exxon Production Research Co, K C Johnson, E Eugene Thigpen, June 14, 1983: US04387769 (219 worldwide citation)

The present invention relates generally to the composition and method for reducing the permeability of subterranean formations penetrated by a wellbore. The composition of the present invention comprises a wellbore fluid having dispersed therein a fluid loss control agent comprising a polyester poly ...


5
Lyle A Johnson Jr, Bruce C Sudduth: Contained recovery of oily waste. Western Research Institute, Browdy and Neimark, July 18, 1989: US04848460 (193 worldwide citation)

A method is provided for recovering oily waste from oily waste accumulations underground comprising sweeping the oily waste accumulation with hot water to recover said oily waste, wherein said area treated is isolated from surrounding groundwater hydraulically. The hot water may be reinjected after ...


6
Russell D Shupe, Jim Maddox Jr: Surfactant oil recovery process usable in high temperature, high salinity formations. Texaco, Carl G Ries, Thomas H Whaley, Jack H Park, March 7, 1978: US04077471 (168 worldwide citation)

Many petroleum formations contain water having high salinity and/or high concentrations of divalent ions such as calcium or magnesium dissolved therein, and are additionally at temperature from about 70.degree. F. to about 300.degree. F. Most surfactants suitable for use in oil recovery operations a ...


7
A Herbert Harvey, John P Govier: Petroleum production method. Senniger Powers Leavitt and Roedel, October 21, 1980: US04228853 (164 worldwide citation)

A method for electrical resistance heating of select portions of a natural underground reservoir, in a geologic formation, that contains both crude oil and water. Through selective resistance heating, oil viscosity is reduced in the select portion of the reservoir. Thus, portions which would not nor ...


8
Jimmie D Weaver, Lawrence E Harris, Weldon M Harms: Polymeric well treating method. Halliburton Company, Thomas R Weaver, Robert A Kent, July 30, 1985: US04532052 (149 worldwide citation)

Several new treatment processes and compositions for practicing these processes are provided which substantially alter the fluid flow and surface characteristics of porous permeable particulate formations, especially subterranean formations intersected by an oil well. The compositions of this invent ...


9
Michael A McCabe, Phillip C Harris, Billy Slabaugh, Ronald J Powell, John M Terracina, Joseph G Yaritz, Chris E Shuchart: Methods of treating subterranean formation using borate cross-linking compositions. Halliburton Energy Services, Robert A Kent, C Clark Dougherty Jr, February 15, 2000: US06024170 (147 worldwide citation)

The present invention provides improved methods of treating subterranean formations using borate cross-linking compositions and borate cross-linked well treating fluids. The borate cross-linking compositions are basically comprised of a low viscosity hydrocarbon liquid, an organophillic clay, a slig ...


10
James E Tackett Jr: In situ reversible crosslinked polymer gel used in hydrocarbon recovery applications. Marathon Oil Company, Jack L Hummel, Jack E Ebel, January 21, 1992: US05082056 (147 worldwide citation)

Reversible crosslinked polymer gels are prepared by adding a degelling agent precursor to a gelation solution during initial preparation. The precursor is integrated into the resulting gel and undergoes hydrolysis to transform into an active degelling agent which reverses the gel. The process has sp ...