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| Number | Title | Issue Date |
| 7867953 | Methods of using drilling fluids containing biodegradable organophilic clay Methods of treating a wellbore comprise displacing a drilling fluid comprising an organophilic clay treated with a quaternary ammonium surfactant having an amide linkage into the wellbore. Methods of drilling a wellbore comprise: applying torque to a bit within the ... | 01/11/2011 |
| 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 |
| 7402549 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer selected from partially hydrolyzed polyvinyl ester and partially hydrolyzed polyacryl... | 07/22/2008 |
| 7398826 | Well treatment with dissolvable polymer Well treatment is disclosed that includes injecting a well treatment fluid with insoluble polyol polymer such as polyvinyl alcohol (PVOH) dispersed therein, depositing the insoluble polymer in the wellbore or an adjacent formation, and thereafter dissolving the poly... | 07/15/2008 |
| 7387986 | Viscoelastic surfactant rheology modification A method for shortening the shear recovery time of cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of an amphiphilic polymeric rheology enhancer containing at least one portion that is a partially hydrolyzed... | 06/17/2008 |
| 7358215 | Quaternary ammonium salts as thickening agents for aqueous systems This invention relates to the use of alkyl amido quaternary ammonium salts, and formulations thereof, as thickening agents in aqueous based fluids, especially those used in oil field applications. The quaternary ammonium salts of the present invention exhibit improv... | 04/15/2008 |
| 7348297 | Topical defoamer and demulsifier Compounds of the formula H(CH2)zCOO—[C2H4O]xCyH2y+1 where z is 0-2, x is an integer from 1 to 5 and y is an integer from 4-9 are used as emulsion breakers and defoamers in formation treat... | 03/25/2008 |
| 7318475 | Matrix acidizing high permeability contrast formations A method for stimulating thick or multilayered heterogeneous or homogeneous formations in a single trip without packers involves perforating with tubing conveyed perforation, then injecting a self-diverting acid, then moving the tubing string and perforating at a ne... | 01/15/2008 |
| 7303018 | Method of acidizing a subterranean formation with diverting foam or fluid A method of acidizing a subterranean formation with a diverting agent composed of a gelled or thickened viscoelastic foam or fluid generated from (i.) an amidoamine oxide gelling agent and (ii.) an acid or foam, water and/or brine. The gelled or thickened foam or fl... | 12/04/2007 |
| 7238648 | Viscoelastic surfactant fluids and related methods of use Viscoelastic surfactant based aqueous fluid systems useful as thickening agents in various applications, e.g. to suspend particles produced during the excavation of geologic formations. The surfactants are zwitterionic/amphoteric surfactants such as dihydroxyl alkyl... | 07/03/2007 |
| 7216709 | Hydraulic fracturing using non-ionic surfactant gelling agent The present invention generally relates to a method for treating a subterranean formation with an aqueous viscoelastic treating fluid that an aqueous base fluid and one or more non-ionic amido amine oxide surfactant gelling agents. The treatment method comprises inj... | 05/15/2007 |
| 7165613 | Propped fracture with high effective surface area Propped fractures in formations from which fluids are produced are described that have wormholes extending out into the formations from the faces of the fractures at locations distant from boreholes. Methods are given for creating such propped fractures having wormh... | 01/23/2007 |
| 7144844 | Method of using viscoelastic vesicular fluids to enhance productivity of formations A process for enhancing the productivity of a formation consists of introducing into the formation a viscoelastic fluid which contains at least one surfactant, at least one quaternary amine polyelectrolyte, water, and a non-aqueous solvent. The surfactant forms aggr... | 12/05/2006 |
| 7060661 | Acid thickeners and uses thereof The present invention generally relates to aqueous, acidic compositions thickened with an amidoamine oxide gelling agent and/or viscoelastic surfactant of the general formula I: wherein R1 is a saturat... | 06/13/2006 |
| 7052901 | Bacteria-based and enzyme-based mechanisms and products for viscosity reduction breaking of viscoelastic fluids It has been discovered that fluids viscosified with viscoelastic surfactants (VESs) may have their viscosities reduced (gels broken) by the direct or indirect action of a biochemical agent, such as bacteria, fungi, and/or enzymes. The biochemical agent may directly ... | 05/30/2006 |
| 6986392 | Recyclable foamed fracturing fluids and methods of using the same Fracturing fluids and methods of fracturing a subterranean formation using such fluids are provided. A fracturing fluid having a first pH is foamed by introducing a gas to the fluid. The fracturing fluid comprises a surfactant that facilitates formation of the foam ... | 01/17/2006 |
| 6951249 | Foamed cement slurries, additives and methods The present invention relates to foamed cement slurries, additives and methods. A foamed cement slurry of the invention comprises a hydraulic cement, sufficient water to form a slurry, sufficient gas to form a foam and an environmentally benign foaming and stabilizi... | 10/04/2005 |
| 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 |
| 6806234 | Topical defoamer and demulsifier Compounds of the formula H(CH2)zCOO—[C2H4O]xCyH2y+1 where z is 0-2, x is an integer from 1 to 5 and y is an integer from 4-9 are used as emulsion breakers and defoamers in formation treat... | 10/19/2004 |
| 6593278 | Method for inhibiting corrosion using certain phosphorus and sulfur-free compounds The present invention relates to a method for inhibiting corrosion of corrosion-prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of certain sulfur and phosphorus-free aromatic compound... | 07/15/2003 |
| 6506710 | Viscoelastic surfactants and compositions containing same A method for controlling the rheology of aqueous systems, particularly for those intended for underground use, includes injecting an aqueous viscoelastic fluid containing a surfactant gelling agent into the system. The viscoelastic surfactant composition ... | 01/14/2003 |
| 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 |
| 6239183 | Method for controlling the rheology of an aqueous fluid and gelling agent therefor A method for controlling the rheology of aqueous systems, particularly for those intended for underground use, includes injecting an aqueous fluid containing a surfactant gelling agent into the system. The surfactant gelling agents are, for example, fatty... | 05/29/2001 |
| 6165946 | Process for the facilitated waste disposal of working substances based on water-in-oil invert emulsions The invention relates to a process for facilitating the disposal of flowable and pumpable working fluids based on emulsifiers containing W/O invert emulsions--more particularly corresponding auxiliaries of the type used in geological exploration, such as ... | 12/26/2000 |
| 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 |
| 6059992 | Gas treating solution corrosion inhibitor Corrosion in aqueous alkanolamine, physical solvents, or combination of alkanolamine and physical solvent solutions used to remove acid gases from natural gas, synthetic gas, or light hydrocarbon streams can be reduced by addition of mixtures of oxygen sc... | 05/09/2000 |
| 6022833 | Multicomponent mixtures for use in geological exploration The invention relates to flowable and pumpable multicomponent mixtures based on a multiphase mixture of water and oil containing emulsifiers and, if desired, other soluble, emulsifiable and/or dispersible auxiliaries for their use in exploration by drilli... | 02/08/2000 |
| 5591701 | Iterated foam process and composition for well treatment In the removal of particulates from a wellbore, such as in air drilling for hydrocarbon recovery, a mixture of an amphoteric foaming agent and, typically, an anionic surfactant is employed. An aqueous solution thereof having a pH of at least 9.5 is used t... | 01/07/1997 |
| 5514645 | Method of gelling hydrocarbons and fracturing subterranean formations The present invention provides a method of treating a subterranean formation by rapidly viscosifying a normally liquid hydrocarbon. The method is accomplished by admixing (i) an alkyl orthophosphate acid ester and (ii) an alkali metal hydroxide present in... | 05/07/1996 |
| 5362408 | High temperature gel stabilizer for fracturing fluids The present invention relates to the use of oximes as thermal decomposition reduction additive for gels used in oil field drilling fluids, fluids used as proppant carriers and fluids used during well completion and workover.... | 11/08/1994 |
| 5264141 | Methods of reducing precipitation from acid solutions Methods and compositions for reducing the precipitation of metal sulfides from acid solutions are provided. The methods basically comprise reducing the precipitation of metal sulfide compounds from an aqueous acid solution when the solution dissolves sulf... | 11/23/1993 |
| 5135668 | Process for inhibiting corrosion in oil production fluids A process for inhibiting corrosion in oil production fluids resides in adding to the oil production fluids an effective amount of betaine or ampholyte of the formulas 1 or 2 ##STR1## wherein R1 is C10 -C20 -alkyl or C... | 08/04/1992 |
| 5080171 | Method of treating subterranean formation with a composition of improved viscosity control Nitrogen containing free radical sources such as diazenes are useful as breakers in fracturing fluids used in the recovery of oil and gas from subterranean formations.... | 01/14/1992 |
| 5043468 | Process for delaying the gelling of unsaturated monomers, delayed-gelling compositions containing the monomers and application of the compositions to the treatment of subterranean formations The present invention relates to a process and compositions for delaying the gelling of vinyl monomers in an aqueous medium in the presence of a polymerization initiator, by employing a polymerization inhibitor consisting of an N-nitrosophenylamine salt i... | 08/27/1991 |
| 5028343 | Stabilized sulfur dissolving compositions A composition of matter is disclosed which includes a major proportion of an organic di- or polysulfide, a catalytic amount of an amine/mercaptan mixture, and a stabilizing component in an amount sufficient to inhibit loss of catalytic activity in storage... | 07/02/1991 |
| 5026491 | Controlling sulfate reducing bacteria by slug dosing with quick-kill antimicrobials and by continuous dosing with isothiazolones A method is described whereby quick-kill and maintenance antimicrobials are used to control biofouling of oil production water injection systems.... | 06/25/1991 |
| 5016714 | Biocidal well treatment method Methods of treating a previously fractured bacteria contaminated subterranean formation penetrated by a well bore whereby the bacteria contamination is substantially reduced or eliminated are provided. The methods basically comprise mixing a bactericide w... | 05/21/1991 |
| 4980074 | Corrosion inhibitors for aqueous brines A high density brine useful as a drilling fluid for deep wells is rendered corrosion resistant by the incorporation of a soluble aliphatic or aromatic aldehyde with or without olefinic unsaturation and with the use of alkali metal thiocyanates or ammonium... | 12/25/1990 |
| 4935205 | Corrosion inhibition A method of inhibiting corrosion of iron or iron-based alloys which are in contact with an aqueous system by introducing and maintaining within the system at least one ortho dihydroxyaromatic compound having at least one electron withdrawing group pendant... | 06/19/1990 |
| 4919209 | Method for treating subterranean formations A method for breaking the fracturing fluid comprises injecting into the subterranean formation a controlled release breaker capsule including an enclosure material enveloping a breaker. The enclosure material is sufficiently permeable to at least one flui... | 04/24/1990 |
