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| Number | Title | Issue Date |
| 7998909 | Foaming agent for subterranean formations treatment, and methods of use thereof A wellbore treatment fluid is formed from an aqueous medium, a gas component, a viscosifying agent, and a surfactant. The surfactant is represented by the chemical formula: [R—(OCH2CH2)m—Oq—YOn] | 08/16/2011 |
| 7429620 | Surfactant package for well treatment and method using same A surfactant blend for servicing wells includes a first non-ionic surfactant having a hydrophilic-lipophilic balance of between about 10 and about 15; a second non-ionic surfactant having a hydrophilic-lipophilic balance of between about 2 and about 6; and an anioni... | 09/30/2008 |
| 7407916 | Foamed treatment fluids and associated methods Foamed treatment fluids comprising water, a gas, and a foaming and foam stabilizing surfactant mixture comprising an alkali salt of an alkyl ether sulfate, wherein the alkali salt of the alkyl ether sulfate comprises an alkali salt of a C6-10 alkyl ether ... | 08/05/2008 |
| 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 |
| 7247604 | Oil-based drilling fluid comprising a temperature-stable and non-polluting emulsifying system A temperature-stable, non eco-toxic oil-base well fluid that is particularly suitable for high pressure/high temperature drilling comprises an emulsification system comprising at least one superamide that may or may not be polyalkoxylated, optionally associated with... | 07/24/2007 |
| 7211550 | Compositions for controlling scaling and completion fluids An aqueous-based composition containing cesium formate and at least one chelating agent is described. Methods of removing scaling deposits, which may include alkaline earth metal sulfates, present on surfaces, including porous media, such as alkaline earth metal sul... | 05/01/2007 |
| 7077219 | Foamed treatment fluids and associated methods Methods in which temperature is used to control the foaming and/or defoaming of foamed treatment fluids comprising an aqueous liquid, an ionic foaming surfactant, and a gas are provided. A method of treating at least a portion of a subterranean formation is provided... | 07/18/2006 |
| 6852676 | Well completion foamed spacer fluids and methods Well completion foamed spacer fluids and methods of using the foamed spacer fluids are provided. A method of the invention for displacing a first fluid from a well bore with an incompatible second fluid comprises the following steps. A foamed spacer fluid is placed ... | 02/08/2005 |
| 6534449 | Removal of wellbore residues A wellbore fluid composition effective to reduce oil-containing residue and water wet wellbore surfaces is provided. The fluid composition comprises a terpene composition and a surfactant. Methods for use of the fluid composition as a single spacer or as ... | 03/18/2003 |
| 6180573 | Weight material for drilling fluids and method of creating and maintaining the desired weight Drilling fluid additives are designed to increase the density of drilling fluids while minimizing the increase in the resistance to flow of the drilling fluid. In particular, barite particles are added to the drilling fluid as a weight material where the ... | 01/30/2001 |
| 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 |
| 6063738 | Foamed well cement slurries, additives and methods The present invention provides improved foamed well cement slurries, additives and methods. The additives, which foam and stabilize a cement slurry containing fresh water or salt water, are basically comprised of a mixture of an ethoxylated alcohol ether ... | 05/16/2000 |
| 5696059 | Methods of preventing well cement stress failure Improved methods of cementing in a well are provided whereby stress failures in the resulting set cement are prevented or reduced. The methods basically comprise the steps of placing a foamed cement composition in a zone in the well to be cemented which w... | 12/09/1997 |
| 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 |
| 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 |
| 5169559 | Method for forming a high viscosity gel The invention is a method for forming a high viscosity gel by mixing about 0.9% to about 3.0% by weight of hydroxy propyl cellulose having an average molecular weight greater than about 1,000,000 about 0.4% to about 3.0% by weight of an alkali metal dodec... | 12/08/1992 |
| 5147565 | Foamed well cementing compositions and methods Foamed well cementing compositions and methods of performing cementing operations in salt containing subterranean environments are provided. The compositions are comprised of hydraulic cement, salt water, dispersed gas and a foaming agent selected from th... | 09/15/1992 |
| 5135052 | Recovery of oil using microemulsions A method of recovering hydrocarbons from subterranean reservoirs by the use of a viscous microemulsion form the single phase region of the ternary diagram of a microemulsion system that is optimal at the reservoir salinity is disclosed. The microemulsion ... | 08/04/1992 |
| 5105884 | 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... | 04/21/1992 |
| 5094296 | Lignin amine microemulsions The invention is a method of recovering hydrocarbons from an underground hydrocarbon formation having at least one injecting well and at least one production well which comprises injecting a microemulsion into the formation through an injection well, driv... | 03/10/1992 |
| 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 |
| 5068043 | Preformed surfactant-optimized aqueous alkaline flood An aqueous alkaline flood for recovering oil from a reservoir containing acidic oil is improved by adding to the injected aqueous alkaline solution both a stoichiometric excess of the alkaline material and a kind and amount of preformed cosurfactant mater... | 11/26/1991 |
| 5035288 | Lignin phenol/lignin/amine surfactant system The invention is a method of recovering hydrocarbons from an underground hydrocarbon formation penetrated by at least one injection well and at least one production well, which comprises injecting into an underground formation through an injection well ab... | 07/30/1991 |
| 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 |
| 4979564 | Method of enhanced oil recovery using low tension viscous waterflood A method is disclosed for recovering oil from a subterranean formation comprising injecting an aqueous composition into said formation and displacing said oil toward one or more production wells, said aqueous composition comprising: (A) from about 0.05% t... | 12/25/1990 |
| 4971707 | Method of producing oil-in-water microemulsions A method for producing a homogeneous oil-in-water microemulsion by first creating a surfactant, oil and water mixture, adding salt to the mixture in a sufficient quantity to drive the mixture into a Type III or Type II(+) phase regime, preparing a solutio... | 11/20/1990 |
| 4886120 | Process for secondary oil recovery utilizing propoxylated ethoxylated surfactants in seawater A process for removing residual oil from the near wellbore area of a subterranean formation adjacent an injection well of a waterflood operation to improve water injectivity comprising injection through said well into said area seawater containing a surfa... | 12/12/1989 |
| 4856589 | Gas flooding with dilute surfactant solutions A gas flooding process for displacing oil within a reservoir is improved by injections of a surfactant having a composition and concentration correlated with those of the brine used to remain substantially within the water phase of the injected fluid at a... | 08/15/1989 |
| 4836282 | Enhanced oil recovery method employing an aqueous polymer A stable latex composition possessing a viscosity of less than about 50 cp. comprised of an ethylacrylate/methylacrylic acid/acrylic acid polymer and co-surfactant system comprising a nonylphenol polyethylene oxide ether sulfate and a propoxylated, ethoxy... | 06/06/1989 |
| 4825950 | Method of enhanced oil recovery using a stabilized polymer combination in chemical flood A method is disclosed for recovering oil from a subterranean formation comprising injecting an aqueous composition into said formation and displacing said oil toward one or more production wells, said aqueous composition comprising: (A) from about 0.01% t... | 05/02/1989 |
| 4821757 | Bioemulsifier stabilized hydrocarbosols Methods and compositions are provided to facilitate the transportation and combustion of highly viscous hydrocarbons by forming reduced viscosity hydrocarbon-in-water emulsions, and in particular, bioemulsifier-stabilized hydrocarbon-in-water emulsions.... | 04/18/1989 |
| 4781207 | Process for the transportation of viscous oils The object of the invention is a process for the transportation of heavy oil whereby an oil-in-water emulsion containing an emulsifier, with at least 10-15% of water is transported and subsequently separated again into crude oil and water. The emulsifier ... | 11/01/1988 |
| 4741844 | Liquid composition and method of use for producing a foamed stimulation fluid for oil and gas wells A method for use of a liquid composition and a liquid composition comprising between about 60 to about 95 volume percent of a water-soluble acid for use in treating subterranean strata, and a base fluid comprising between about 90 to about 60 volume perce... | 05/03/1988 |
| 4739831 | Gas flooding process for the recovery of oil from subterranean formations In a gas flooding operation, the sweep efficiency of the gas is improved using a surfactant solution comprising an alkylated diphenyl sulfonate.... | 04/26/1988 |
| 4738789 | Surfactant solvent composition A micellar acidic surfactant solvent composition of enhanced oil/organic solvency and method of preparing and using same. The oil solvency of a propoxylated/ethoxylated surfactant and alcohol micellar acidizing system is enhanced by controlling or selecti... | 04/19/1988 |
| 4736795 | Composition and process for enhanced oil recovery A process for recovering crude oil from a subterranean formation comprising injecting into the formation a liquid composition consisting essentially of a specific surfactant in an aqueous medium and injecting a gas to urge the composition toward a product... | 04/12/1988 |
| 4703797 | Sweep improvement in enhanced oil recovery A method for sweep improvement during enhanced oil recovery in a subterranean oil-bearing formation concerns the generation of foam by the dispersion of the displacing fluid in an aqueous solution of a mixed surfactant system. The mixed surfactant system ... | 11/03/1987 |
