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| Number | Title | Issue Date |
| 7749944 | Viscoelastic surfactant fluid systems comprising an aromatic sulfonate and methods of using same Methods of improving shear recovery time of viscoelastic surfactant fluid systems are described, one method involving providing a viscoelastic surfactant fluid system comprising a major portion of a surfactant and a rheology enhancer in a concentration sufficient to... | 07/06/2010 |
| 7662752 | Chemical wash compositions for removing drilling fluids Chemical wash compositions comprising a sulfonated lignin and a taurate are provided. In one embodiment, a chemical wash composition is provided comprising water, a sulfonated lignin, and a taurate. ... | 02/16/2010 |
| 7507693 | Viscoelastic surfactant fluid systems comprising an aromatic sulfonate and methods of using same Methods of improving shear recovery time of viscoelastic surfactant fluid systems are described, one method involving providing a viscoelastic surfactant fluid system comprising a major portion of a surfactant and a rheology enhancer in a concentration sufficient to... | 03/24/2009 |
| 7351680 | High performance water-based mud system A drilling fluid or mud additive having several components, including leonardite (humic acid); potassium acetate; partially hydrolyzed polyacrylamide (PHPA); polyanionic cellulose polymer (PAC); sulfonated asphalt; sulfoalkylated tannin; polystyrene maleic anhydride... | 04/01/2008 |
| 7303014 | Casing strings and methods of using such strings in subterranean cementing operations Improved casing strings, and methods of using improved casing strings in subterranean cementing operations, are provided. An example of an apparatus is a pipe string comprising at least one pipe section and a delivery system of an activator. Another example of an ap... | 12/04/2007 |
| 7297664 | Cement-free zeolite and fly ash settable fluids and methods therefor Zeolite and Class F fly ash compositions are provided for use as cement-free settable fluids such as settable spotting fluids and cementitious compositions. ... | 11/20/2007 |
| 7255731 | Use of particular polysaccharides as admixtures for mineral materials The subject of the present invention is the use of particular polysaccharides as admixtures for mineral materials, especially as admixtures for mineral binders. These polysaccharides have, characteristically: a weight-average molec... | 08/14/2007 |
| 7220707 | Sized barite as a weighting agent for drilling fluids An additive that increases the density of fluids containing a sized barite weighting agent. The wellbore fluid has rheological properties comparable to a conventional wellbore fluids but does not exhibit problems with sag and resulting variations in density. An illu... | 05/22/2007 |
| 7196040 | Microcapsule well treatment A material and a device for releasing chemicals in a fluid environment is disclosed, and a method for releasing substances into downhole fluid environments. The invention also relates to materials for sand control and hydraulic fracturing. The substance release devi... | 03/27/2007 |
| 7176165 | Method of drilling using a sized barite as a weighting agent for drilling fluids An additive that increases the density of fluids containing a sized barite weighting agent. The wellbore fluid has rheological properties comparable to a conventional wellbore fluids but does not exhibit problems with sag and resulting variations in density. An illu... | 02/13/2007 |
| 7169738 | Method of using a sized barite as a weighting agent for drilling fluids An additive that increases the density of fluids containing a sized barite weighting agent. The wellbore fluid has rheological properties comparable to a conventional wellbore fluids but does not exhibit problems with sag and resulting variations in density. An illu... | 01/30/2007 |
| 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 |
| 6828280 | Methods for stimulating hydrocarbon production Methods are provided for stimulation of hydrocarbon production from low permeability formations by hydraulic fracturing, acid fracturing, and hydraulic fracturing followed by gravel packing in a single operation. The methods use a first injected viscous pad made wit... | 12/07/2004 |
| 6806232 | Composition of drilling fluids comprising ground elastomeric crumb rubber material and a method of decreasing seepage and whole mud loss using such composition Well-working fluid compositions containing certain processed inorganic, oil and water wettable ground elastomeric crumb rubber materials to decrease the seepage loss of various fluids to subterranean formations in which these well working fluids are required and uti... | 10/19/2004 |
| 6762155 | Methods of removing water-based drilling fluids and compositions The present invention provides methods and compositions for removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet. A method of the invention basically comprises the following steps. A water-based drilling fluid removal... | 07/13/2004 |
| 6743756 | Suspensions of particles in non-aqueous solvents Liquid suspensions of particles in non-aqueous solvents are extremely stable over long periods of time with minimum separation of the solvent and no hard packing of the dispersed particles. The suspensions enable a user to rapidly add the suspension to water and to ... | 06/01/2004 |
| 6734144 | Solids-stabilized water-in-oil emulsion and method for using same A method for enhancing the stability of a solids-stabilized water-in-oil emulsion by pretreating the oil prior to emulsification. The pretreatment step can be accomplished by adding dilute acid to the oil, adding a lignosulfonate additive to the oil, sulfonating the... | 05/11/2004 |
| 6554069 | Methods of removing water-based drilling fluids and compositions The present invention provides methods and compositions for removing a water-based drilling fluid from surfaces in a well bore and leaving the surfaces water-wet. A method of the invention basically comprises the following steps. A water-based drilling fl... | 04/29/2003 |
| 6514916 | Process for making sulfonated uintaite and well fluid additives including sulfonated uintaite Sulfonated uintaite is prepared by sulfonating a naturally occurring uintaite charge with a sulfonating agent such as sulfur trioxide, fuming sulfuric acid, chlorosulfonic acid, oleum, or concentrated sulfuric acid to produce sulfonic acids of uintaite. T... | 02/04/2003 |
| 6186231 | Conformance improvement in hydrocarbon bearing underground strata using lignosulfonate-acrylic acid graft copolymer gels A method for reducing the permeability of a region of an underground formation by injecting a gelant solution that forms a stable gel into the region is disclosed. The gelant solution includes an aqueous solvent, about 2% to about 16% by weight of a ligno... | 02/13/2001 |
| 6051535 | Asphaltene adsorption inhibition treatment A subterranean formation is treated to inhibit adsorption of asphaltenes by injecting a treatment fluid containing a sacrificial compound, such as a lignosulfonate. The lignosulfonate may be adsorbed onto formation surfaces in such a way as to act to inhi... | 04/18/2000 |
| 5399548 | Blended drilling fluid thinner A blended additive composition, which is useful for thinning aqueous drilling fluids, is disclosed. The composition includes a first component selected from the group including: a modified tannin, a modified lignite and sodium lignosulfonate; a second com... | 03/21/1995 |
| 5325921 | Method of propagating a hydraulic fracture using fluid loss control particulates A two-fluid method for fracturing a subterranean formation to increase the production of fluids from a well therein has been discovered. In a typical operation, a fluid pad is injected into the well which essentially simultaneously fractures the formation... | 07/05/1994 |
| 5291949 | Method for inhibiting caustic flood breakthrough 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.... | 03/08/1994 |
| 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 |
| 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 |
| 5111886 | Crosslinked hydroxyethylcellulose and its uses 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.... | 05/12/1992 |
| 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 |
| 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 |
| 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 |
| 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 |
| 5009268 | Method of using a combination lignosulfonate/polyalkylene glycol system as a sacrificial agent for surfactant flooding A sacrificial agent solution which is compatible with high molecular weight mobility control polymers for enhanced oil recovery, said solution comprising about 0.1% to about 5% by weight of a lignosulfonate and about 0.01% to about 5% by weight of a polya... | 04/23/1991 |
| 4931489 | Fluid loss control additives for oil well cementing compositions A cementing composition useful in cementing oil, gas and water wells, comprising water, hydraulic cement and an effective amount of water soluble fluid loss additive comprised of a copolymer of acrylamide/vinyl imidazole and derivatives thereof in a weigh... | 06/05/1990 |
| 4821803 | High salinity polymer drive for surfactant flooding systems 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, in which a saline polymer slug containing about 0.1% to about 3.0% of a drive fluid ... | 04/18/1989 |
| 4822501 | 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... | 04/18/1989 |
| 4793419 | Adding lignosulfonate to caustic floods to shift optimal salinity to a higher salinity The invention is a method for recovering hydrocarbons from an underground hydrocarbon reservoir penetrated by at least one injection well and at least one production well, which comprises injecting into the reservoir through an injection well an aqueous c... | 12/27/1988 |
| 4787454 | Recovering hydrocarbons with surfactants from lignin A method of producing surfactants from lignin is disclosed by reducing lignin in the presence of a carbon monoxide or hydrogen reducing agent at high temperature and pressure to produce low molecular weight lignin phenols and subjecting the lignin phenols... | 11/29/1988 |
| 4781251 | Recovering hydrocarbons with water soluble alkylphenol lignin surfactants The invention is a method of recovering hydrocarbons with a surfactant flooding system, wherein the surfactant slug comprises about 0.1% to about 10% by weight of an alkylphenol lignin surfactant. The alkylphenol lignin surfactant is produced by reacting ... | 11/01/1988 |
| 4756370 | Lignin amine surfactant system followed by sequential polymer slugs 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 employs the steps of injecting a lignin amine surfactant slug, injecting an aq... | 07/12/1988 |
