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4821802 |
Aqueous sulfomethylated melamine gel-forming compositions and methods of use
Aqueous gel-forming compositions are prepared by reacting for 1-10 hours at 50°-95° C., melamine, formaldehyde and a sulfurous acid salt with the optional addition of a gel-modifying agent and/or...
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4817721 |
Reducing the permeability of a rock formation
Permeability of a highly permeable zone in a subterranean formation is reduced by injecting into the formation a polymerizable material which expands on polymerization, and thereafter effecting...
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4812486 |
Absorbent resin with excellent stability
An absorbent composition having excellent stability comprising an absorbent resin and 0.01 to 30 percent by weight, based on the dried weight of said absorbent resin, of a radical chain terminator.
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4810732 |
Amino resin modified polymer gels for permeability control
A composition of matter wherein amino resins such as melamine formaldehyde ("MF") resins modify polysaccharide polymers thereby forming gels with transitional metal ions useful for profile control...
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4806164 |
Method of reducing fluid loss in cement compositions
Cementing compositions having improved fluid loss capabilities for use in oil, gas, water and other well cementing operations are disclosed. Such compositions are comprised of water, hydraulic...
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4796700 |
Process for retarding fluid flow
A gel-forming composition is provided comprising a first substance selected from the group consisting of a polyvinyl alcohol, a polyvinyl alcohol copolymer, and mixtures thereof, glutaraldehyde,...
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4795764 |
Poly(oxyalkylene) poly(aliphatic isocyanate) prepolymer and polyurea polymer derived therefrom by reaction with polyamine
Air is mechanically entrained in an aqueous solution of surfactant, polyamine reactant, and low moisture sensitive poly(oxyalkylene) poly(aliphatic isocyanate) prepolymer the poly(oxyalkylene)...
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4793416 |
Organic crosslinking of polymers for CO2 flooding profile control
A process for recovering hydrocarbonaceous fluids from a formation having a substantially low pH where a rehealable gel prepared ex-situ is used to close off a zone of greater permeability. Said...
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4792262 |
Process for strengthening geological formations
The present invention is directed to a process for strengthening geological formations in underground mining or other operations introducing into the formation which is to be strengthened mixtures...
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4787451 |
Melamine/formaldehyde cross-linking of polymers for profile control
An improved process for forming improved gels where biopolymers and synthetic polymers are cross-linked with melamine/formaldehyde and other amino resins at an optimal range of ratios of amine to...
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4785028 |
Gels for profile control in enhanced oil recovery under harsh conditions
A composition of matter where a polymer is partially hydrolyzed to form a polymer intermediate which can be gelled. Said polymer intermediate consists of 2-acrylamido-2-methylpropane-3 sulfonate,...
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4782900 |
Aminoalkylated polyacrylamide aldehyde gels, their preparation and use in oil recovery
Aqueous gel-forming compositions useful for improving oil recovery from subterranean hydrocarbon-containing reservoirs are prepared by reacting an aminoalkylated polyacrylamide with an aldehyde,...
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4783492 |
Continuous permeability reduction in subterranean reservoirs
A composition for selectively reducing the permeability of the higher permeability zones of a subterranean reservoir having heterogeneous permeability, such permeability reduction extending...
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4773482 |
Reducing permeability of highly permeable zones in oil and gas formations
High permeability zones in subterranean formations are reduced in permeability by the gelation of water soluble polymers of polyalkylenimines, polyalkylenepolyamines and mixtures thereof in such...
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4770245 |
Rate-controlled polymer gelation process for oil recovery applications
A process for controlling the gelation rate of a carboxylate-containing polymer used in oil recovery applications. A gel is prepared by mixing a single aqueous gelation solution at the surface made...
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4767550 |
Vicinal diol containing monomers and polymers and methods of treating a subterranean formation
The present invention provides vicinal diol containing monomers and polymers and methods of preparing and using such monomers and polymers. When crosslinked in aqueous fluids, the polymers form...
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4767460 |
Cement compositions for cementing of wells enabling gas channelling in the cemented annulus to be inhibited by right-angle setting
The cement compositions according to the invention are designed for cementing wells, in particular oil and gas or geothermal wells, and for withstanding very high temperatures. A combination of...
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4757862 |
Shale stabilizer and method of use thereof
Water-soluble copolymers which are essentially free of cross-linking are useful as shale stabilizers. These copolymers are random copolymers of a vinyl carboxamide monomer and a hydroxy-containing...
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4744418 |
Delayed polyacrylamide gelation process for oil recovery applications
A process for delaying the gelation rate of a polymer used in oil recovery applications. A gel is prepared by mixing a single aqueous gelation solution at the surface made up of a polyvalent metal...
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4723605 |
Accelerated polymer gelation process for oil recovery applications
A process for accelerating the gelation rate of a carboxylate-containing polymer used in oil recovery applications. A gel is prepared by mixing a single aqueous gelation solution at the surface...
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4722397 |
Well completion process using a polymer gel
An uncased wellbore penetrating a subterranean hydrocarbon-bearing formation is sealed by forming a gel at the open wellbore face comprising a high molecular weight, water-soluble...
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4721160 |
Composition for a lightweight cement slurry for cementing oil and gas wells
A lightweight cement slurry composition having a density in the range of 1.2 to 1.6, containing a solid extender agent and an SBR latex. The ratio of the liquid volume to the slurry volume should...
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4721161 |
Method for decreasing permeability around a wellbore
The permeability of an underground formation near a wellbore can be substantially decreased by the injection of one or more slugs of an aqueous solution containing an in situ forming gel of...
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4715746 |
Method of strengthening geological formations
The present invention relates to a method of strengthening geological formations in underground workings or mines by introducing reaction mixtures containing a polyisocyanate component (a), a...
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4708974 |
Enhanced hydrocarbon recovery by permeability modification with phenolic gels
Hydrocarbon recovery from subterranean reservoirs that are penetrated by either injector or producer wells is enhanced by selective permeability modification of the strata of the reservoir with...
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4706754 |
Oil recovery process using a delayed polymer gel
A process for reducing the permeability of a high permeability region in a subterranean hydrocarbon-bearing formation by preparing an aqueous gelation solution at the surface comprised of a...
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4703801 |
Method of reducing fluid loss in cement compositions which may contain substantial salt concentrations
Cementing compositions having improved fluid loss capabilities for use in oil, gas, water and other well cementing operations are disclosed. Such compositions are comprised of water, hydraulic...
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4704213 |
Encapsulated oil absorbent polymers as lost circulation additives for oil based drilling fluids
The disclosed invention is a novel drilling fluid additive for use in reducing lost circulation in wellbores and a method for employing the invention additive for reducing such lost circulation....
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4690996 |
Inverse emulsions
Polysaccharide graft copolymers are prepared by a water-in-oil emulsion polymerization process in which the polysaccharide and water-soluble monomer are emulsified in an oil phase containing...
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4687790 |
Mine stopping caulk
A process for sealing geological formations and mine stoppings by applying to these substrates an aqueous, non-cementitious caulk composition comprising an alkali metal silicate; filler material...
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4683953 |
Shear thickening compositions containing polyacrylic acid and polyacrylamide, their preparation and use
The dispersed aqueous phase of a shear thickening composition, useful as a well control fluid which comprises a water-in-oil emulsion having hydratable, water-expandable hydrophillic clay,...
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4678032 |
Polymer and method for permeability profile control under severe reservoir conditions
A method and composition for treating subterranean formation by reducing formation permeability by injecting into the formation through a well bore, a first polymer solution including a polymer...
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4676930 |
Zirconium crosslinked gel compositions, methods of preparation and application in enhanced oil recovery
Homogeneous, strong and stable zirconium crosslinked gels prepared from a crosslinking composition comprised of a zirconium (IV) compound and a water-soluble compound containing a sulfate or...
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4674574 |
Fluid loss agents for oil well cementing composition
Cementing compositions and methods of using such compositions in oil, gas and water well cementing operations to reduce fluid loss from the composition to the formation are disclosed. Such...
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4673038 |
Gel and process for preventing carbon dioxide break through
A gel-forming composition is provided comprising a first substance selected from the group consisting of a polyvinyl alcohols, polyvinyl alcohol copolymers, and mixtures thereof, a second substance...
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4671883 |
Fluid loss control additives for oil-based well-working fluids
Fluid loss control additives for oil-based well-working fluids comprise a solubilized lignite derivative and an oil-swellable or oil-soluble polymer. The solubilized lignite derivative may be...
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4669920 |
Soil sealing compositions and methods
A soil sealing composition suitable for reducing the permeability of soil to water contaminated with electrolyte comprises an expanding lattice clay and a water soluble or water swellable polymer...
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4670165 |
Method of recovering hydrocarbons from subterranean formations
A method of treating a subterranean formation comprising contacting the formation with an aqueous composition of desired viscosity. The aqueous composition is prepared by polymerizing water-soluble...
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4665987 |
Prepartially crosslinked gel for retarding fluid flow
A gel-forming composition is provided comprising a PVA based substance selected from the group consisting of a polyvinyl alcohol, a polyvinyl alcohol copolymer, and mixtures thereof, aldehyde, and...
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4665986 |
Gel and method for reducing steam channeling
A gel-forming composition is provided comprising a PVA based substance selected from the group consisting of a polyvinyl alcohol, a polyvinyl alcohol copolymer, and mixtures thereof, an aldehyde...
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4664563 |
Rigid polyurethane foams with constant or slightly decreasing strain with an increasing stress in compression
Rigid polyurethane foams which exhibit constant or slightly decreasing strain with an increasing stress in compression are prepared employing from 30 to 60 parts of an oxyalkylated toluenediamine...
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4664713 |
Composition for and method of altering the permeability of a subterranean formation
A crosslinking composition and method for reducing the permeability of a subterranean formation. The crosslinking composition comprises aluminum cations having a valence of 3 + and zirconium...
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4663366 |
Shear thickening composition with polycarboxylic acid
A shear thickening composition which comprises a water-in-oil emulsion having dispersed in the continuous, oily phase thereof, hydratable, water-expandable hydrophillic clay, wherein said oily...
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4659750 |
Fluid loss control in oil field cements
An aqueous slurry which comprises (a) a cement; (b) about 0.05 to 5.0 wt. % of a copolymer of N-vinylpyrrolidone and a salt of styrenesulfonic acid based on the dry weight of said cement; (c) about...
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4658898 |
Oil reservoir permeability control using polymeric gels
The permeability of subterranean oil-bearing formations is selectively reduced by the injection into the formation of the non-xanthan, anionic heteropolysaccharide S-130 produced by fermentation...
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4657944 |
CO.sub.2 -induced in-situ gelation of polymeric viscosifiers for permeability contrast correction
A water permeability contrast correction process to improve the sweep efficiency of waterflooding which involves the sequential injection of (1) an optional aqueous preflush slug to adjust connate...
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4657943 |
Thickeners
A thickening agent having improved resistance under alkaline conditions comprises a synergistic mixture of an acrylate polymer and bentonite. These thickening agents are useful in textile padding...
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4652606 |
Water-based drilling fluids having enhanced fluid loss control
A water based drilling fluid and process for using the same comprising a mixture of water and a polymer complex, wherein the polymer complex is the reaction product of a dispersant selected from...
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4652384 |
High temperature drilling fluid component
What is disclosed is a cross-linked starch which provides better fluid loss control in well drilling fluids than conventional starches at elevated temperatures. The starch may be derived from any...
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4644020 |
Production of high molecular weight vinyl lactam polymers and copolymers
Water-soluble polymers comprising an N-vinyl lactam are found to be useful in processes wherein the polymer is introduced into a subterranean wellbore. Polymers useful in the recovery of natural...
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