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| Number | Title | Issue Date |
| 8076272 | Method of making a synthetic alkylaryl sulfonate A process for preparing an alkylaryl sulfonate comprising (a) reacting at least one meta-xylene compound with olefin or a mixture of olefins having from about 10 to about 20 carbon atoms, in the presence of an acid catalyst, wherein the resulting product comprises n... | 12/13/2011 |
| 7638469 | Methods of increasing permeability in carbonatic rock formations with alkanesulfonic acids Methods of increasing permeability in a carbonatic rock formation, the methods comprising: providing an alkanesulfonic acid; and introducing the alkanesulfonic acid into the carbonatic rock formation. ... | 12/29/2009 |
| 7576043 | Viscoelastic wellbore fluid comprising an anionic surfactant A wellbore fluid comprising a surfactant, the surfactant having the formula (R1—X)nZ, wherein R1 is an aliphatic group—comprising a C18-C22 principal straight chain bonded at a terminal carbon atom thereof t... | 08/18/2009 |
| 7468343 | Alkylxylene sulfonates for enhanced oil recovery processes The present invention is directed to a method for enhancing the recovery of oil from a subterranean reservoir which method employs an alkylxylene sulfonate that contains a high percentage of the 4-alkyl-1,2-dimethyl benzene isomer and a high percentage of alkyl grou... | 12/23/2008 |
| 7378378 | Rheology enhancers A method for increasing the rate of shear rehealing of fluids made with cationic, zwitterionic, and amphoteric viscoelastic surfactant fluid systems by adding an effective amount of a rheology enhancer package containing, for example a polyethylene glycol-polypropyl... | 05/27/2008 |
| 7332460 | Alkylxylene sulfonates for enhanced oil recovery processes The present invention is directed to alkylxylene sulfonate for enhanced oil recovery processes. The alkylxylene moiety in the alkylxylene sulfonate contains a high percentage of the 4-alkyl-1,2-dimethyl benzene isomer and a high percentage of alkyl group attachment ... | 02/19/2008 |
| 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 |
| 7303019 | Viscoelastic surfactant fluids and associated diverting methods Provided are treatment fluids that comprise an aqueous base fluid, and a methyl ester sulfonate surfactant, and associated diverting methods of use. In one embodiment, the present invention provides a method of treating a subterranean formation comprising: providing... | 12/04/2007 |
| 7299874 | Viscoelastic surfactant fluids and associated methods Provided are treatment fluids that comprise an aqueous based fluid, a water-soluble salt, and a methyl ester sulfonate surfactant, and associated methods. In one embodiment, a method of treating a subterranean formation is provided, the method comprising: providing ... | 11/27/2007 |
| 7296627 | Method for simultaneous removal of asphaltene, and/or paraffin and scale from producing oil wells A method for cleaning oil wells to increase the flow of oil thereof by use of a unique aqueous cleaning emulsion comprising of water, hydrocarbon solvent, detergent and mineral acid. This one step method provides for the simultaneously cleaning/removal of asphaltine... | 11/20/2007 |
| 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 |
| 7267291 | Additive for increasing the density of an oil-based fluid and fluid comprising such additive A wellbore fluid having an oleaginous phase and an additive for increasing the density of the wellbore fluid. The additive comprises solid colloidal particles coated with a dispersant during the comminution process of forming the particles. Exemplary starting materi... | 09/11/2007 |
| 7262153 | Method and composition for enhanced hydrocarbons recovery A method of treating a hydrocarbon containing formation is described. The method may include providing a hydrocarbon recovery composition to the hydrocarbon containing formation. Hydrocarbons in the hydrocarbon containing formation may interact with the hydrocarbon ... | 08/28/2007 |
| 7256306 | Arylalkylsulfonic acids and methods for producing same This invention relates new and improved processes for the preparation of arylalkylsulfonic acids derived from aromatic or substituted aromatic molecules and AOS acid (generally a mixture of alkenesulfonic acid and sultones, produced from the sulfonation of alpha ole... | 08/14/2007 |
| 7229950 | Method and composition for enhanced hydrocarbons recovery A method of treating a hydrocarbon containing formation is described. The method may include providing a hydrocarbon recovery composition to the hydrocarbon containing formation. Hydrocarbons in the hydrocarbon containing formation may interact with the hydrocarbon ... | 06/12/2007 |
| 7207388 | Non-Damaging Fluid-Loss Pill and Method of Using the Same A fluid-loss pill that includes a brine solution and an effective amount of a viscoelastic surfactant is disclosed. The viscoelastic surfactant preferably includes at least one compound selected from the family of compounds described by | 04/24/2007 |
| 7205262 | Friction reducing composition and method Water soluble nonionic friction reducers and added to coacervate gels having excellent shear viscosities and other properties. A preferred gel comprises poly diallyl dimethyl ammonium chloride, a lesser amount of sodium lauryl sulfonate, and lauryl alcohol. Excellen... | 04/17/2007 |
| 7159659 | Viscoelastic surfactant fluids and associated acidizing methods Provided are treatment fluids that comprise an aqueous base fluid, an acid, and a methyl ester sulfonate surfactant, and associated methods of use. In one embodiment, the present invention provides a method of acidizing a subterranean formation comprising: providing... | 01/09/2007 |
| 7160843 | Oil-based demulsifying agent and its use in the treatment of drains bored in oil-based mud An oil-based demulsifying formulation which can be used in the treatment of drains bored in oil-based mud, non ecotoxic and optimally compatible with formation fluids, comprises at least one wetting agent chosen from anionic surfacetants and at least one demulsifier... | 01/09/2007 |
| 7137447 | Method and composition for enhanced hydrocarbons recovery A method of treating a hydrocarbon containing formation is described. The method may include providing a hydrocarbon recovery composition to the hydrocarbon containing formation. Hydrocarbons in the hydrocarbon containing formation may interact with the hydrocarbon ... | 11/21/2006 |
| 7125826 | Methods of using invertible oil external-water internal fluids in subterranean applications Methods of using invertible oil external-water internal emulsions in drilling, hydraulic fracturing, gravel packing and completion and then inverting the emulsion to a water external-oil internal emulsion are provided. The methods basically comprise the steps of con... | 10/24/2006 |
| 7098172 | Prevention and treatment of lost circulation with crosslinked polymer material A process to substantially reduce fluid loss in which an appropriate amount of a non-flowing gel of sufficient strength is emplaced to substantially eliminate or reduce loss of the drilling fluid. The gel composition of the process includes: (1) a non-cellulose cont... | 08/29/2006 |
| 7081438 | Drilling fluids, drilling fluids additives and methods useful for limiting tar sands accretion on metal surfaces Fluids useful in oil well drilling operations are described. The fluids comprise standard viscosifying and fluid loss control additives along with phosphonates or phosphate esters of organic ligands. The addition of the phosphonates or phosphate esters at effective ... | 07/25/2006 |
| 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 |
| 7055602 | Method and composition for enhanced hydrocarbons recovery A method of treating a hydrocarbon containing formation is described. The method may include providing a hydrocarbon recovery composition to the hydrocarbon containing formation. Hydrocarbons in the hydrocarbon containing formation may interact with the hydrocarbon ... | 06/06/2006 |
| 7028776 | Methods for the inhibition of salt blockages in oil and gas wells Compositions and methods for the inhibition of salt formation in oil and gas wells are disclosed. In particular, nitrilotriacetamide and its salts are effective at treating existing salt formations, and in inhibiting formation of new deposits. ... | 04/18/2006 |
| 6989355 | Under-neutralized alkylxylene sulfonic acid composition for enhanced oil recovery processes The present invention is directed to an under-neutralized alkylxylene sulfonic acid composition for enhanced oil recovery processes. The present invention is also directed to a method for enhancing the recovery of oil from a subterranean reservoir which method emplo... | 01/24/2006 |
| 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 |
| 6881708 | Compositions for solving lost circulation problems A method and composition is provided for sealing a subterranean zone penetrated by a well bore and restoring lost circulation, wherein the composition basically comprises a mixture of latex, melamine-formaldehyde resin, and a catalyst. ... | 04/19/2005 |
| 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 |
| 6828281 | Surfactant blends for aqueous solutions useful for improving oil recovery The present invention relates to an aqueous fluid useful for the recovery of a liquid hydrocarbon from subterranean reservoirs comprising an aqueous media and a surfactant blend. The aqueous fluid has an alkaline pH. The surfactant blend comprises at least one synth... | 12/07/2004 |
| 6800594 | Corrosion inhibitor barrier for ferrous and non-ferrous metals An environmentally friendly corrosion inhibiting formulation for the oil-water interface of pipe lines and oil well drilling systems which is prepared pursuant to a process including the steps of reacting an acid selected from the group consisting of a fatty acid an... | 10/05/2004 |
| 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 |
| 6770603 | Electrically conductive non-aqueous wellbore fluids A wellbore fluid having a non-aqueous continuous liquid phase that exhibits an electrical conductivity increased by a factor in order of 104 to 107 compared to conventional invert emulsion comprises from about 0.2% to about 10% by volume of car... | 08/03/2004 |
| 6762154 | Viscoelastic surfactant fluids stable at high brine concentrations Present invention relates to high brine carrier fluid, said carrier fluid selected from the group consisting of organic acids, organic acid salts, inorganic salts and combination of one or more organic acids or organic acid salts, a co-surfactant and an amount of a ... | 07/13/2004 |
| 6667280 | Fluid system having controllable reversible viscosity This Invention relates to a novel reversible thickener, i.e., a fluid whose viscosity can be carefully modulated--from very low viscosity to sufficient viscosity to act as a barrier to further flow; particularly preferred embodiments are directed to fluid... | 12/23/2003 |
| 6608006 | Methods of drilling well bores using invertible oil external-water internal drilling fluids Methods of drilling well bores using an invertible oil external-water internal emulsion drilling fluid and then inverting the drilling fluid to a water external-oil internal emulsion are provided. The methods basically comprise the steps of contacting the... | 08/19/2003 |
| 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 |
| 6586372 | Additive for increasing the density of a fluid and fluid comprising such additive An additive which increases the density of wellbore fluids used during the construction or repair of oil, gas, injection, water or geothermal wells comprises solid colloidal particles of weight average particle diameter (D50) of less than 2 mic... | 07/01/2003 |
| 6583091 | Method for inhibiting corrosion using 4-sulfophthalic acid The present invention relates to a method for inhibiting high temperature corrosion of corrosion prone metal surfaces by organic acid-containing petroleum streams by providing an effective corrosion-inhibiting amount of 4-sulfophthalic acid, typically up ... | 06/24/2003 |
