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| Number | Title | Issue Date |
| 7211548 | Treatment fluids comprising starch and ceramic particulate bridging agents and methods of using these fluids to provide fluid loss control Methods and compositions relating to fluid loss control operations are provided. More particularly, fluid loss treatment fluid compositions may comprise ceramic particulate bridging agents, a partially depolymerized starch derivative, and a base fluid. In some embod... | 05/01/2007 |
| 7196039 | Methods of reducing fluid loss in a wellbore servicing fluid Methods of reducing the fluid loss from a wellbore servicing fluid include combining a terpolymer with the wellbore servicing fluid to reduce the fluid loss from the fluid, followed by displacing the fluid into a wellbore. In an embodiment, the following monomers ar... | 03/27/2007 |
| 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 |
| 5677267 | Thixotropic fluid for well insulation A thixotropic thermal insulating fluid includes a heavy hydrocarbon, water and oleophilic clay, wherein said heavy hydrocarbon is present in an amount of between about 75% to about 92% by volume of the fluid, said water is present in an amount of between ... | 10/14/1997 |
| 5656070 | Corrosion inhibiting compositions containing plant derived catechol complexes Corrosion inhibiting composition include the use of certain plant derived catechol complexes in aqueous based compositions, such as process water, and other aqueous and non-aqueous solvent based coating compositions. The compositions have corrosion inhibi... | 08/12/1997 |
| 5478802 | Gelling compositions useful for oil field applications A gelling composition and a process for wellbore treatment comprising injecting the composition into reservoirs are disclosed wherein the composition comprise a produced brine; a water-soluble polymer such as, for example, polyacrylamide; a crosslinker su... | 12/26/1995 |
| 5441928 | Aqueous gellable composition containing an anti-syneresis agent An aqueous gellable composition capable of producing gels resistant to syneresis in the presence of divalent ions, contains: a water-soluble acrylamide polymer or copolymer, a crosslinking agent formed by a water-soluble aldehyde, or a water-soluble aldehyde a... | 08/15/1995 |
| 5418217 | Composition for selectively reducing subterranean formation permeability Visible gels are formed by mixing an inorganic crosslinking agent with a low viscosity aqueous solution having a low polyacrylamide concentration and devoid of polymers containing a vicinal diol pendant group. The visible gels are employed to reduce the w... | 05/23/1995 |
| 5358045 | Enhanced oil recovery method employing a high temperature brine tolerant foam-forming composition An enhanced oil recovery technique for recovering hydrocarbons from a reservoir during gas injection comprises the at least periodic injection of gas and a foam-forming composition into the reservoir. The foam-forming composition comprises water, an effec... | 10/25/1994 |
| 5338465 | Aqueous gellable composition with delayed gelling time An aqueous gellable composition having a delayed gelling time presettable within wide time and temperature ranges, contains a water-soluble organic polymer crosslinkable with chrome ion and a crosslinking/retardant system definable by the formula: Cr(L) | 08/16/1994 |
| 5335733 | Method for delaying gelation of a gelable polymer composition injected into a subterranean formation The gelation of a gelable composition is delayed by using, inter alia, a crosslinking rate retardant selected from the group consisting of epoxides, ethers, and mixtures thereof.... | 08/09/1994 |
| 5323857 | Process for enhancing oil recovery using scleroglucan powders The present invention is directed to a process for improving the dispersibility and the filterability of scleroglucan powders, in which a surfactant is incorporated in the coagulated polymer. The powder obtained according to the process has a dispersibili... | 06/28/1994 |
| 5322123 | Use of gel-based compositions for reducing the production of water in oil- or gas-producing wells The invention has as its object the use of new composition of gels that can be used for the reduction of the production of water in oil- or gas-producing wells. The compositions of gels comprise a solution of at least one water-soluble complex of a polyva... | 06/21/1994 |
| 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 |
| 5277830 | pH tolerant heteropolysaccharide gels for use in profile control A pH tolerant aqueous gel-forming composition for placement within a subterranean formation. The composition includes water, a viscosifying amount of a heteropolysaccharide prepared by growing Xanthomonas campestris NCIB 11854 in an aqueous nutrient medi... | 01/11/1994 |
| 5271464 | Temporary plugging agent The present invention provides a method of temporarily plugging or sealing a subterranean formation by introducing a rapidly viscosifying liquid hydrocarbon into the formation. The method is accomplished by admixing a first component comprising an alkyl o... | 12/21/1993 |
| 5268112 | Gel-forming composition Gels containing gas precursors and/or pathways are used to selectively reduce the flow of aqueous fluids with respect to the flow of nonaqueous fluids to enhance the recovery of the nonaqueous fluids from subterranean formations. The gels, while stable at... | 12/07/1993 |
| 5256315 | Gellable aqueous compositions containing polymers with special chelating functional groups useful for recovering oil from an oil field Gellable compositions containing: (a) water; (b) a water-soluble organic polymer bearing special chelating functional groups; (c) a multi-valent metal ion capable of causing the polymer to crosslink, are useful to recover oil from a oil field. Said compositions mak... | 10/26/1993 |
| 5219476 | Gellable aqueous composition and its use in enhanced petroleum recovery The permeability of high-permeability zones in a oil reservoir can be reduced by using a gellable aqueous composition with delayed gelation. The composition comprises: a) water; b) a high-molecular weight natural or synthetic water-soluble polymer cross-l... | 06/15/1993 |
| 5219475 | Aqueous gellable composition, useful for modifying the permeability of a petroleum reservoir An aqueous gellable composition having a delayed gelling time is disclosed, which contains a water-soluble polymer crosslinkable with Cr3+ and a crosslinking/retardant system containing a Cr3+ ion and a salicylic acid ligand, wherein... | 06/15/1993 |
| 5211858 | Lanthanide-crosslinked polymers for subterranean fluid containment 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.... | 05/18/1993 |
| 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 |
| 5146986 | Methods of reducing the water permeability of water and oil producing subterranean formations A method of reducing the water produced from a subterranean formation penetrated by a wellbore without appreciably reducing the oil produced therefrom is provided. In accordance with the method, the formation is contacted with a hydrocarbon treating solut... | 09/15/1992 |
| 5133408 | Rate controllable gel for conformance improvement treatment in a subterranean hydrocarbon-bearing formation A conformance improvement treatment process is provided for reducing the permeability of a higher-permeability zone in a subterranean hydrocarbon-bearing formation which is in fluid communication with a lower-permeability zone of the formation. The proces... | 07/28/1992 |
| 5132029 | Method and composition for reducing the permeability of a high-permeability zone in an oil reservoir A method for reducing the permeability of a high-permeability zone in a high-temperature oil reservoir comprises: preparing a gellable polymeric aqueous solution, operating on the surface under controlled conditions; injecting said gellable solution into the o... | 07/21/1992 |
| 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 |
| 5100567 | Shear-thickening solutions with hydroxypropyl cellulose The invention is an aqueous shear-thickening composition comprising in one embodiment about 0.2% to about 1% by weight of hydroxypropyl cellulose having an average molecular weight between about 1,000,000 and about 1,300,000, about 0.1% to about 0.7% by w... | 03/31/1992 |
| 5099923 | Clay stabilizing method for oil and gas well treatment A clay swelling inhibitor additive for oil and gas well treatment is disclosed. The additive comprises an aqueous solution of tetraalkylammonium chloride, preferably tetramethylammonium chloride and a quaternary amine-based cationic polyelectrolyte, such ... | 03/31/1992 |
| 5082577 | Method and composition for selectively reducing permeability to water in hydrocarbon reservoirs which are hot and saline For selectively reducing permeability to water in an underground formation producing oil and/or gas, injecting into the formation a composition comprising water, at least one water soluble aldehyde compound at a concentration (by weight) of 180 to 20,000 ... | 01/21/1992 |
| 5062969 | Crosslinkable interpolymers The present invention relates to novel crosslinkable interpolymers and methods of use in treating subterranean formations. The novel interpolymers comprise a water soluble monomer, a hydrophobe monomer, and vicinal diol monomer polymerized to form high mo... | 11/05/1991 |
| 5043364 | Gelation of acrylamide-containing polymers with furfuryl alcohol and water dispersible aldehydes A novel composition and process are disclosed for forming crosslinked gels at elevated temperatures utilize a novel crosslinking agent comprising a furan derivative and a water dispersible aldehyde or aldehyde generating compound.... | 08/27/1991 |
| 5032296 | Well treating fluids and additives therefor An additive for reducing the water loss and improving other properties of well treating fluids in high temperature subterranean environments and well treating fluids including the additive are provided. The additive comprises a mixture of a water soluble ... | 07/16/1991 |
| 5028344 | Stabilizing agent for profile control gels and polymeric gels of improved stability An aqueous polymeric gel-forming composition of improved stability for selectively plugging highly permeable zones in subterranean oil-bearing formations. The composition comprises an aqueous solution of a water-dispersible polymer present in a viscosifyi... | 07/02/1991 |
| 5015400 | Amino resins crosslinked polymer gels for permeability profile control A composition of matter wherein amino resins such as melamine formaldehyde ("MF") resins co-gel and crosslink with polymers useful for profile control where said polymers have amine, amide, hydroxyl and thiol functionalities. Resulting gels are useful as ... | 05/14/1991 |
| 4994194 | Altering high temperature subterranean formation permeability A method and composition for altering the permeability of a high temperature subterranean formation are provided. The composition of the invention is comprised of water, at least one water dispersible acrylamide containing polymer, and a water dispersible... | 02/19/1991 |
| 4986355 | Process for the preparation of fluid loss additive and gel breaker A melted polymer of hydroxyacetic acid with itself or with other hydroxy-, carboxylic acid-, or hydroxycarboxylic acid-containing moieties is subjected to high shear and injected into an organic liquid which is inert to the polymer to form an organic liqu... | 01/22/1991 |
| 4986356 | Method of removing polymer gels from a petroleum reservoir When used as occlusion agents or to cause fractures in a petroleum reservoir, polymer gels crosslinked with polyvalent metal ions can be removed by the use of special complexing agents.... | 01/22/1991 |
| 4982789 | Method of using urea as a sacrificial agent for surfactants in enhanced oil recovery The disclosed invention is a method of injecting a solution or emulsion containing about 0.05% to about 10% by weight of urea as a sacrificial agent for surfactants into an underground formation in enhanced oil recovery operations, said underground format... | 01/08/1991 |
| 4977960 | Sodium hydroxide treatment of field water in a biopolymer complex A method for reducing the gelation time of a biopolysaccharide which utilizes a hydroxide of an alkaline earth metal in an aqueous solution containing said biopolysaccharide wherein the mixture is afterwards complexed with a polyvalent metal ion. The resu... | 12/18/1990 |
| 4968442 | Gel composition and method of treatment A composition for treating a subterranean formation and a method of treatment. An aqueous gel composition is formed by mixing a carboxylate-containing polymer with a crosslinking agent comprised of chromic carboxylate. Ethylenediaminetetraacetic acid is i... | 11/06/1990 |
