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| Number | Title | Issue Date |
| 7977284 | Non-estrogenic alkylphenol derivatives A method of making phenol and alkylphenol ethoxylates non-estrogenic by inserting 1 mole of propylene oxide onto the phenolic group before proceeding with the addition of ethylene oxide or mixtures of ethylene and propylene oxide. The final phenolic products can be ... | 07/12/2011 |
| 7704927 | Method of acid fracturing a sandstone formation Methods and compositions useful in acidizing a subterranean formation with an oil-in-water emulsion that includes a sulfonate ester, a fluoride salt, a proppant, and water. The reaction of the ester and fluoride salt is delayed so that hydrofluoric acid is produced ... | 04/27/2010 |
| 7622429 | Non-emulsifying anti-sludge composition for use in the acid treatment of hydrocarbon wells A composition for inhibiting or preventing the formation of emulsions and asphaltic sludges in the presence of treating acids during the acid stimulation of hydrocarbon wells is provided. The composition includes an alkyl aryl sulfonic acid or salt thereof, an acety... | 11/24/2009 |
| 7507695 | Non-emulsifying anti-sludge composition for use in the acid treatment of hydrocarbon wells A composition for inhibiting or preventing the formation of emulsions in the presence of treating acids during the acid stimulation of hydrocarbon wells is provided. The composition includes an alkyl aryl sulfonic acid or salt thereof, an acetylenic alcohol, an alky... | 03/24/2009 |
| 7357857 | Process for extracting bitumen Bitumen extraction done using a process comprising: (a) preparing a bitumen froth comprising particulate mineral solids and hydrocarbons dispersed in aqueous lamella in the form of an emulsion; (b) adding a sufficient amount of a paraffinic solvent to the froth to i... | 04/15/2008 |
| 7326670 | Well service fluid and method of making and using the same A well service fluid comprising one or more anionic viscoelastic surfactants and one or more polymers is described. The fluids can contain an aqueous or non-aqueous fluid and/or a buffer for adjusting the pH of the fracturing fluid. The well service fluid can be use... | 02/05/2008 |
| 7320952 | Additive for viscoelastic fluid Composition and method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a co-gelling agent selected from triblock oligomeric compounds having hydrophilic (for exam... | 01/22/2008 |
| 7290614 | Methods for effecting controlled break in pH dependent foamed fracturing fluid The invention provides a fluid for use in a subterranean formation penetrated by a wellbore, the fluid comprising: (a) water; (b) delayed release acid; (c) a surfactant comprising a tertiary alkyl amine etboxylate generally represented by the following formula: ... | 11/06/2007 |
| 6995120 | Scale control composition for high scaling environments Barium sulfate and/or calcium carbonate scale inhibitor composition composed of a water-soluble polymer having incorporated phosphate functionality, the polymer being formed from at least one ethylenically unsaturated carboxylic acid monomer, at least one ethylenica... | 02/07/2006 |
| 6984610 | Acid based micro-emulsions of surfactants and solvents Acid based micro-emulsions are disclosed comprising water, an acid blend, an anionic surfactant, a nonionic surfactant, a co-solvent, a solvent and an oxidizer. The micro-emulsions have particular utility in cleaning oil sludges and drilling mud residues from well c... | 01/10/2006 |
| 6942031 | Lignosulfonate-acrylic acid graft copolymers as sacrificial agents for carbon dioxide foaming agents The invention is a method for improving conformance during a carbon dioxide foam flood, which comprises injecting into the formation an aqueous solution of about 0.05% to about 5% by weight of a carbon dioxide foaming surfactant, and about 0.05% to about 5% by weigh... | 09/13/2005 |
| 6800593 | Hydrophilic polymer concentrates Disclosed is a hydrophilic, water soluble polymer concentrate for addition to aqueous liquids to enhance the properties thereof, particularly to increase the viscosity or decrease the fluid loss of well drilling and servicing fluids, the concentrate comprising a hyd... | 10/05/2004 |
| 6593279 | Acid based micro-emulsions Acid based micro-emulsions are disclosed comprising water, an acid blend, an anionic surfactant, a nonionic surfactant, a co-solvent, a solvent and an oxidizer. The micro-emulsions have particular utility in cleaning oil sludges and drilling mud residues ... | 07/15/2003 |
| 6488091 | Subterranean formation treating fluid concentrates, treating fluids and methods Subterranean formation treating fluid concentrates, treating fluids and methods are provided by the present invention. The treating fluid concentrates are basically comprised of water and a substantially fully hydrated depolymerized polymer. The treating ... | 12/03/2002 |
| 6291406 | Method for treating subterranean formations A well treatment fluid such as a fracturing fluid or drilling fluid which comprises a water-in-oil emulsion containing an amine or amine oxide surfactant of the following formula: ##STR1## or a protonated form thereof ##STR2## wherein R3 i... | 09/18/2001 |
| 6117364 | Acid corrosion inhibitor An acid corrosion inhibitor composition is provided for petroleum wells and water wells subjected to stimulation with acid solutions. The inhibitor combines cinnamaldehyde and an organo-sulfur compound. The inhibitor provides a reduced rate of corrosion a... | 09/12/2000 |
| 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 |
| 5968879 | Polymeric well completion and remedial compositions and methods Polymeric well completion and remedial compositions which form highly pliable impermeable masses of desired rigidity and methods of using the compositions are provided. The compositions are basically comprised of water, a water soluble polymerizable monom... | 10/19/1999 |
| 5942469 | Heavy oil well stimulation composition and process A composition for and an improved process of, enhancing petroleum recovery from a petroleum reservoir by injecting said composition into the reservoir through a wellbore are provided. The aqueous composition is derived from a concentrate which includes a ... | 08/24/1999 |
| 5797456 | Surfactant additive for oil field acidizing Subterranean oil-bearing formations are treated with aqueous acid solutions which include an effective amount of an ester or salts of sulfonated fatty acids, which exhibits both antisludge and demulsification properties.... | 08/25/1998 |
| 5762138 | Method of preventing incompatibility between aqueous well treating fluids and hydrocarbons The present invention provides microemulsion surfactant additives for use in aqueous well treating fluids to prevent the formation of stable emulsions and sludge when the aqueous treating fluids contact hydrocarbons. The additives are basically comprised ... | 06/09/1998 |
| 5710109 | Method for acidizing formation having high permeability water zones An improved method for acidizing an oil bearing formation in the presence of water bearing zones having high permeability is described. An aqueous fluid is pumped into the formation preceding the injection of stimulation material. This fluid contains hydr... | 01/20/1998 |
| 5543387 | Surfactant additive for oilfield acidizing Subterranean oil-bearing formations are treated with aqueous acid solutions which include an effective amount of an alkoxylated alkyl substituted phenol sulfonate which exhibits both antisludge and demulsification properties.... | 08/06/1996 |
| 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 |
| 5389706 | Well cement compositions having improved properties and methods Improved cement compositions and methods of using such compositions in carrying out construction and remedial operations in oil and gas wells at high temperatures are provided. The compositions are basically comprised of hydraulic cement, sufficient water... | 02/14/1995 |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5171459 | Scale deposition inhibitor A aqueous oil well scale inhibiting composition is disclosed as well as a dispersion and scale inhibiting method. The inhibitor comprises a phosphate ester or phosphonate calcium carbonate inhibitor and a sulfonated alkyldiphenylether zinc and/or lead sul... | 12/15/1992 |
| 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 |
| 5083612 | Hot water, surfactant, and polymer flooding process for heavy oil Injection of steam or other thermal fluid for recovery of heavy crude oil is accompanied by or followed by injection in the same well of a solution of petrochemical sulfonate and a co-surfactant, the co-surfactant being either an olefin sulfonate or a pro... | 01/28/1992 |
| 5076363 | Surfactant-polymer composition and method of enhanced oil recovery The present invention provides for a composition comprising: (A) at least one compound represented by the formula RO--(R')n R"X- Y+ wherein: R is a hydrocarbyl group of from about 6 to about 24 carbon atoms; R' is ethoxy, propo... | 12/31/1991 |
| 5074358 | Surfactant-stabilized foams for enhanced oil recovery A foam is provided for use in a subterranean oil-bearing formation for reducing and controlling the mobility of a gaseous drive fluid. The foam is generated using an inert gas and a fluorocarbon surfactant solution in admixture with an amphoteric or anion... | 12/24/1991 |
| 5062970 | Surfactant composition A surfactant composition, suitable for enhanced oil recovery comprising in a 60:40 to 10/90 weight ratio a) (o,m)- and/or (o,p)-dialkylbenzene alkali sulfonate and b) polyalkoxyphenyl ether alkali sulfonate.... | 11/05/1991 |
| 5046560 | Oil recovery process using arkyl aryl polyalkoxyol sulfonate surfactants as mobility control agents A method for recovering oil from a subterranean formation is disclosed wherein an aqueous surfactant solution is injected into the formation to reduce the mobility of gas in a gas-flooding process. The gas may include hydrocarbon gas, inert gas, carbon di... | 09/10/1991 |
| 5013462 | Method for improving production of viscous crude oil This invention concerns methods for improving the mobility and pipeline transport of a viscous crude oil and the productivity of viscous crude oil producing wells by forming an oil-in-water emulsion with said oil and from 20 to 80% by weight of water in t... | 05/07/1991 |
| 5000262 | 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... | 03/19/1991 |
| 4990269 | Surface active compound, a microemulsion containing said compound and the use thereof A surface active compound for use in microemulsions useful in oil recovery, wood impregnating, dry cleaning, cleaning of hard surfaces and for floor polishing, which has one hydrophobic group, containing 9-50, preferably 12-35 carbon atoms and 2-6 separat... | 02/05/1991 |
