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| Number | Title | Issue Date |
| 7373977 | Process for oil recovery employing surfactant gels A process for recovering oil by injecting into a subterranean oil-bearing reservoir through one or more injection wells, an aqueous solution containing one or more amphoteric alkyl amido betaine surfactants that form a viscoelastic gel reducing interfacial tension a... | 05/20/2008 |
| 6043391 | Anionic surfactants based on alkene sulfonic acid New anionic surfactants and methods of preparation which are derived from aromatic or substituted aromatic molecules and alkenesulfonic acid. Wherein the aryl compound is alkylated and sulfonated in one-step with an alkene sulfonic acid prior to sulfonic ... | 03/28/2000 |
| 6022834 | Alkaline surfactant polymer flooding composition and process An improved concentrated surfactant formulation and process for the recovery of residual oil from subterranean petroleum reservoirs, and more particularly an improved alkali surfactant flooding process which results in ultra-low interfacial tensions betwe... | 02/08/2000 |
| 5911276 | Use of unmodified kraft lignin, an amine and a water-soluble sulfonate composition in enhanced oil recovery A method for the enhanced recovery of oil comprises injecting into an oil-containing formation an aqueous surfactant system having at least (1) a blend containing an unmodified Kraft lignin, an oil-soluble amine and a water-soluble sulfonate, and (2) wate... | 06/15/1999 |
| 5780395 | Foam for improving sweep efficiency in subterranean oil-bearing formations A foam is provided having utility for improving sweep efficiency in subterranean oil-bearing formations and having specific utility for conformance improvement treatments and mobility control in such formations. The foam is a gel medium having a gas dispe... | 07/14/1998 |
| 5725771 | Process for enzyme pretreatment of drill cuttings Process for the treatment of drilling muds recovered at the surface of the ground, especially synthetic muds, characterized in that it comprises at least one stage of hydrolysis of said mud by means of a lipase.... | 03/10/1998 |
| 5478802 | Gelling compositions useful for oil field applications A gelling composition and a process for wellbore treatment comprising injecting the composition into reservoirs are disclosed wherein the composition comprise a produced brine; a water-soluble polymer such as, for example, polyacrylamide; a crosslinker su... | 12/26/1995 |
| 5401425 | Recovering enhanced oil recovery surfactants by temperature cycling A method for recovering surfactants from produced fluids by mixing with produced fluids about 0.1% to about 5% of a nonionic surfactant having a phase inversion temperature above the temperature of the produced fluids, heating the mixture above the phase ... | 03/28/1995 |
| 5341878 | Fatty acid salts as steam foaming agents A steam foam method of recovering hydrocarbons from an underground hydrocarbon formation, which comprises injecting steam through an injection well into the formation, injecting an aqueous solution having a salinity greater than about 1% by weight and a p... | 08/30/1994 |
| 5333687 | Long chain alcohol additives for surfactant foaming agents The invention is a method for increasing the effectiveness of steam or carbon dioxide foaming operations for improving conformance during steam or carbon dioxide floods by adding to the surfactant foaming solution an alcohol having about 8 to about 20 car... | 08/02/1994 |
| 5325920 | Enhanced oil recovery from low permeability reservoirs using organosilicone surfactants A method for enhanced oil recovery in a reservoir having a substantial silicon content where an organosilicone surfactant is co-injected with steam to generate a foam. The organosilicone surfactant component of the foam prevents a dissolution of the silic... | 07/05/1994 |
| 5323857 | Process for enhancing oil recovery using scleroglucan powders The present invention is directed to a process for improving the dispersibility and the filterability of scleroglucan powders, in which a surfactant is incorporated in the coagulated polymer. The powder obtained according to the process has a dispersibili... | 06/28/1994 |
| 5318709 | Process for the production of surfactant mixtures based on ether sulfonates and their use A process for the production of a surfactant mixture for use in enhanced oil recovery wherein the surfactant mixture comprises an alkyl ether sulfonic acid or salt thereof as a principal constituent and at most a substantially equal quantity of alkoxylate... | 06/07/1994 |
| 5311943 | Blends of propoxy and ethoxy surfactants A mixture of propoxylated and ethoxylated surfactants is provided, along with a method to displace water flood residual oil from subterranean formations utilizing this mixture. The mixture is considerably less expensive than surfactants containing both pr... | 05/17/1994 |
| 5282984 | Generating bitumen-in-water dispersions and emulsions The invention is a method for generating bitumen-in-water dispersions and emulsions useful for recovering and transporting bitumen, which comprises mixing an aqueous surfactant solution with bitumen at an elevated temperature, said surfactant system compr... | 02/01/1994 |
| 5279367 | Fatty acid additives for surfactant foaming agents The invention is a method for increasing the effectiveness of steam or carbon dioxide foaming operations for improving conformance during steam or carbon dioxide floods by adding to the surfactant foaming solution a fatty acid having about 12 to about 20 ... | 01/18/1994 |
| 5273682 | Viscosity control additives for foaming mixtures The method for the enhanced recovery of hydrocarbons from a hydrocarbon bearing reservoir during gas injunction into the reservoir comprises the at least periodic injection of steam and a foam-forming mixture into the reservoir from a known depth interval... | 12/28/1993 |
| 5251698 | Method of using lignosulfonate-acrylic acid graft copolymers as sacrificial agents for surfactant flooding A sacrificial agent method employing lignosulfonate-acrylic acid graft copolymers to reduce chemical loss to the formation during hydrocarbon recovery by surfactant system injection and sweep through an underground formation.... | 10/12/1993 |
| 5250201 | Polymeric substance and method of separating and culturing bacteria J-1 which is a strain of cyanobacteria is used to form and excrete a material useful as an emulsifying agent for forming emulsions of hydrocarbons and oils in liquids such as water. Method of separating and culturing the cyanobacteria under conditions nec... | 10/05/1993 |
| 5246072 | Method for enhancing the recovery of petroleum from an oil-bearing formation using a mixture including anionic and cationic surfactants A foam-forming composition comprising a mixture of at least one anionic surfactant and at least one cationic surfactant can effectively form a foam in a variety of formations including an oil-wet environment. In particular, this composition can be employe... | 09/21/1993 |
| 5230814 | Hydrocarbon recovery comprising injecting a slug comprising oil soluble alkoxylated surfactants from lignin A method of producing oil soluble surfactants from lignin is disclosed, along with a method for recovering oil from underground formations by means of a surfactant flooding system containing these lignin surfactants. Lignin is reduced in the presence of a... | 07/27/1993 |
| 5226480 | Recovery system containing lanthanide-crosslinked polymers Polymers (and especially hydroxyethylcellulose) are crosslinked using a lanthanide as a crosslinking agent. The crosslinked polymers have utility in well completion, well stimulation, enhanced oil recovery, and subterranean fluid containment operations.... | 07/13/1993 |
| 5203411 | Oil recovery process using mobility control fluid comprising alkylated diphenyloxide sulfonates and foam forming amphoteric surfactants The recovery of hydrocarbons from subterranean formations is improved by the use of a mobility control fluid comprising a mixture of at least one alkylated diphenyl oxide and at least one amphoteric surfactant. A preferred mobility control fluid comprises... | 04/20/1993 |
| 5193618 | Multivalent ion tolerant steam-foaming surfactant composition for use in enhanced oil recovery operations A method for recovering hydrocarbons from a reservoir during gas injection into the reservoir comprises at least periodically injecting a gas comprising steam and a foam-forming composition which includes at least one steam foam diversion surfactant into ... | 03/16/1993 |
| 5175278 | Heteropolysaccharide S-657 The new heteropolysaccharide S-657, prepared by fermentation of a new strain of Xanthomonas campestris, ATCC 53159, has valuable properties as a thickening, suspending and stabilizing agent in aqueous solutions and is especially valuable for use in well t... | 12/29/1992 |
| 5167281 | Dialkylate additives for surfactant sytems The invention is a method of moving hydrocarbons through an underground formation for later recovery which comprises injecting an aqueous surfactant system having about 0.5% to about 10% of one or more surfactants and about 0.5% to about 10% of an alkoxyl... | 12/01/1992 |
| 5143632 | Polysiloxane polymer having pendant aromatic groups useful in enhanced oil recovery using carbon dioxide flooding A polysiloxane polymer having pendant aromatic groups that is useful in increasing the viscosity of carbon dioxide. That polymer can be formed by reacting a polysiloxane containing at least one olefinic group with a phenyldialkylsilane. That polymer can b... | 09/01/1992 |
| 5139087 | Method for ensuring injectivity of polymer solutions Without interrupting an enhanced oil recovery polymer flood of a subterranean formation, ultrasonic energy is used to maintain the injectivity of a polymer solution during the polymer flood by modifying the properties of the injected polymer solution.... | 08/18/1992 |
| 5123486 | Polysilylenesiloxane polymers useful in enhanced oil recovery using carbon dioxide flooding A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises a polysilylenesiloxane polymer, preferably polydimethylsilylenedimethylsiloxane. That polymer can be used in a method for recovering oil from an un... | 06/23/1992 |
| 5114599 | Use of lignin/amine/surfactant blends in enhanced oil recovery A method for the enhanced recovery of oil comprised of injecting into an oil containing formation an aqueous surfactant system comprised of a blend of an oil soluble amine, a lignin selected from the group consisting of lignosulfonates and sulfonated alka... | 05/19/1992 |
| 5105887 | Enhanced oil recovery technique using hydrogen precursors In situ hydrogenation in a subterranean formation is readily performed by introducing a non-gaseous hydrogen precursor into steam to form a composition. The composition is injected into the oil-bearing subterranean formation to enhance the recovery of the... | 04/21/1992 |
| 5102561 | Processes of thickening and of oil recovery using polysaccharide polymer made by xanthomonas A polysaccharide polymer is disclosed which is a better viscosifier of water than xanthan gum. The polysaccharide polymer and its non-acetylated form, are comprised of glucose and mannose moieties in a ratio of about 2:1. The invention also discloses Xant... | 04/07/1992 |
| 5102560 | Organosilicon polymer having nonrandom crosslinkages useful in enhanced oil recovery using carbon dioxide flooding A polymer is disclosed that is useful in increasing the viscosity of carbon dioxide. That polymer comprises an organosilicon polymer having nonrandom crosslinkages that enhance backbone rigidity. Preferably, that polymer is a polyalkylsilsesquioxane. That... | 04/07/1992 |
| 5100567 | Shear-thickening solutions with hydroxypropyl cellulose The invention is an aqueous shear-thickening composition comprising in one embodiment about 0.2% to about 1% by weight of hydroxypropyl cellulose having an average molecular weight between about 1,000,000 and about 1,300,000, about 0.1% to about 0.7% by w... | 03/31/1992 |
| 5095986 | Enhanced oil recovery using oil soluble sulfonates from lignin and benzyl alcohol The invention is a method of producing oil soluble surfactants from lignin which comprises reacting benzyl alcohol with lignin phenol at elevated temperature in the presence of a non-nucleophilic basic catalyst to produce a lignin phenol reaction product,... | 03/17/1992 |
| 5095985 | Enhance oil recovery using oil soluble sulfonate surfactants from lignin and alkylphenol The invention is a method of producing oil soluble surfactants from lignin which comprises reacting an alkylphenol having an alkyl chain of about 5 to about 20 carbon atoms with formaldehyde at elevated temperature to produce an intermediate product and r... | 03/17/1992 |
| 5094295 | Enhanced oil recovery using alkylated, sulfonated, oxidized lignin surfactants The invention is a method of producing water soluble surfactants from lignin, which comprises alkylating lignin at phenolic oxygen sites with an alkyl chain having about 3 to about 24 carbon atoms, sulfonating the alkylated lignin, and oxidizing the alkyl... | 03/10/1992 |
| 5092405 | Alkoxylated surfactant system for heavy oil reservoirs The invention is a method of recovering heavy oil from an underground reservoir by surfactant flooding which comprises injecting an aqueous surfactant solution comprising about 0.1% to about 5% by weight of an alkoxylated nonionic or ionic surfactant thro... | 03/03/1992 |
| 5089151 | Fluid additive and method for treatment of subterranean formations A treatment fluid additive and method for treatment of subterranean formations to minimize formation permeability damage as a result of formation contact by the treatment fluid, wherein the fluid treatment additive is a formation control additive of the g... | 02/18/1992 |
| 5085787 | Crosslinked vinylamine polymer in enhanced oil recovery The production of oil or gas from a subterranean formation is enhanced by injecting into the formation, such as in acidized fracturing, an aqueous fluid containing as a viscosifier a crosslinked vinylamine polymer. Acidizing fluids are provided containing... | 02/04/1992 |
