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5122549 |
Crosslinkable cellulose derivatives
Novel treating fluid compositions containing crosslinkable non-ionic cellulose derivatives and methods of use in petroleum recovery operations are disclosed. The treating fluid polymers are...
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5116413 |
Process and sealing agent for producing a watertight and/or gastight bushing of lines in a water-resistant and/or gas-blocking wall, and device for use thereof
A process is provided for feeding cables, wires, pipes etc. through a wall in such a way that the water- and/or gas resistance of the wall is maintained and that later on additional cables etc. can...
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5110484 |
Drilling fluid with stabilized browning reaction anionic carbohydrate
A fluid is provided for the drilling, workover or completion of a subterranean well comprising an aqueous base, the browning reaction product of a carbohydrate, and a cation. Inversion of...
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5106517 |
Drilling fluid with browning reaction anionic carbohydrate
A fluid is provided for the drilling, workover or completion of a subterranean well comprising an aqueous base, the browning reaction product of a carbohydrate, and a cation. Inversion of...
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5104912 |
Phenolic and naphtholic ester crosslinked polymeric gels for permeability profile control
An aqueous polymeric gel-forming composition which slowly crosslinks to form stable gels for plugging highly permeable zones in subterranean oil-bearing formations. The composition comprises an...
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5103909 |
Profile control in enhanced oil recovery
Oil recovery method using polymer solutions in which highly permeable strata are made significantly less permeable while less permeable strata are not made significantly less permeable. This is...
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5100931 |
Gelation of acrylamide-containing polymers with hydroxyphenylalkanols
A novel process is disclosed for crosslinking water-soluble polymers with a hydroxyphenylalkanol crosslinking agent.
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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...
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5100952 |
Organically crosslinked polyvinyl alcohol copolymeric gels for use under harsh reservoir conditions
A gel-forming composition capable of plugging highly permeable zones in a subterranean formation. The composition comprises water, a water-dispersible polyvinyl alcohol copolymer and a crosslinking...
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5099922 |
Control of gas flow through cement column
This invention involves cementing compositions for the oil industry and their use in cementing wells. More specifically, this invention involves the control of the gas migration or gas channeling...
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5091448 |
Suspending medium for water soluble polymer
A new stable liquid suspension of water soluble polymer, and a method of preparation are provided. Such compositions comprise of at least an iso-parrafinic oil medium, one styrene/isoprene...
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5085787 |
Crosslinked vinylamine polymer in enhanced oil recovery
The production of oil or gas from a subterranean formation is enhanced by injecting into the formation, such as in acidized fracturing, an aqueous fluid containing as a viscosifier a crosslinked...
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5086089 |
Programmed gelation of polymers using melamine resins
A process for use with a polymer which is crosslinkable by reaction with an amino resin, which comprises the steps of determining a period of time within which full gelation of the polymer is to be...
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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...
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5065822 |
Crosslinking water soluble polymers with iron to form gels for use in subterranean profile modification
A process of profile modifying permeable soils with an environmentally safe composition of a non-toxic water-soluble polymer, a redox couple of a water-soluble ferrous salt and a non-toxic,...
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5061387 |
Aqueous gel system of partially methylated melamine-formaldehyde resin and polyvinyl alcohol
A stable aqueous gel is formed from a polyvinyl alcohol or vinyl alcohol copolymer and a partially methylated melamine-formaldehyde resin in the presence of a pH regulating agent which provides an...
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5049288 |
Set retarded cement compositions and methods for well cementing
Set retarded cement compositions for cementing across a zone or zones in a well having enhanced compressive strength and rapid gel strength development after placement. The cement compositions are...
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5048607 |
In-situ emulsion polymerization of ethylene derivatives
A profile control method for closing off a more permeable zone of a formation where water, high fluid flow, or high perssures are encountered. A water-external emulsion containing a monomer, a...
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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...
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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...
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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...
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5028342 |
Drilling mud additives based on a polymer mixture, their use, and a process for their production
Drilling mud additives based on a polymer mixture of 20 to 80% by weight carboxymethyl cellulose and 80 to 20% by weight of a polycarboxylic acid selected from polyacrylate, polymethacrylate and/or...
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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,...
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5005648 |
Treating underground formations
Wells penetrating oil-producing and water-producing intervals may be treated in order to reduce the flow rate of water into the well by isolating the water-producing interval and introducing into...
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5002980 |
Method for imparting selectivity to otherwise nonselective polymer control gels
A method for selectively closing pores in a zone of greater permeability in a formation for profile control. A rehealable Xanthan biopolymer is combined with a crosslinked non-selective...
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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...
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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...
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4980393 |
Polymers for oil reservoir permeability control
Improved polymer gels for oil reservoir permeability control have a continuous, cross-linked polymer phase having a relatively low density of cross-linking with domains of clustered, high density...
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4974677 |
Profile control process for use under high temperature reservoir conditions
A process for selectively plugging zones of high permeability within an oil-bearing subterranean formation. The process of the present invention comprises the steps of injecting into the formation...
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4972007 |
Use of cellulose derivatives in drilling fluids
Cellulose derivatives which are substituted in a specified manner by both carboxyalkyl groups and sulphoalkyl groups which are suitable in drilling fluids.
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4964465 |
Method employing liquidized sand for controlling lost circulation of drilling fluids
The disclosed invention is a method for reducing lost circulation in wellbores. In the method, a liquidized sand, comprised of a particulate material, a resin, and a carrier fluid comprising a...
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4963597 |
Selective gel system for permeability profile control
An aqueous gel composition is formed from xanthan gum crosslinked with ions of a transitional metal, resorcinol, and formaldehyde. The gel which initially forms is injected into a formation where...
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4958685 |
Method for plugging lost circulation areas and lost circulation material to be used therefor
A method for plugging the areas of lost circulation occurred during the drilling of a well with the use of a drilling mud, and a lost circulation material to be used therefor. The lost circulation...
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4934456 |
Method for 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...
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4933378 |
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...
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4926944 |
Lignin-based cement fluid loss control additive
Sulfonated or sulfomethylated lignins reacted with phenol-blocking reagents such as ethylene oxide, propylene oxide, butylene oxide or a combination thereof are disclosed as fluid loss agents for...
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4921047 |
Composition and method for sealing permeable subterranean formations
A mixture of an epoxy material and two hardeners is placed in a subsurface zone in which it is desired to form an impermeable zone, and the epoxy is thereafter allowed to harden. The epoxy material...
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4915174 |
Concentrated suspensions of water soluble polymers
The invention provides concentrated suspensions of high molecular weight water soluble polymers comprising a high molecular weight water soluble polymer, a nonpolymer solvating organic diluent, a...
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4909324 |
Block copolymers useful for enhanced oil recovery processes
Polymers and gels useful for permeability control in subterranean formations, said polymers having structural forms of ABA triblocks and (AB) n multiblock are disclosed.
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4903767 |
Selective gelation polymer for profile control in CO.sub.2 flooding
A process for the selective gelation of a polymer for profile control during carbon dioxide flooding. First, a size selective gel is formed ex-situ. Upon entering a thief zone or a more permeable...
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4904125 |
Process for strengthening geological formations
The present invention is directed to a process for the strengthening of geological formations in underground workings and mines by the introduction of reaction mixtures which react to form...
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4896723 |
Cross-linked polyvinyl alcohols and oil reservoir permeability control therewith
A novel cross-linked polymer is obtained by cross-linking polyvinyl alcohol with a cross-linking agent which is a mixture of a phenolic component and an aldehyde or a mixture of a naphtholic...
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4888120 |
Water-based drilling and well-servicing fluids with swellable, synthetic layer silicates
Synthetic swellable layer silicates corresponding to the following formula MgO.aMA.bAl 2 O 3 .cSiO 2 .nH 2 O (I) in which M is Na + and Li + having an Na:Li ratio of at least 1;...
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4885103 |
Cross-linking titanium & zirconium chelates & their use
Water-soluble N,N-bis-(2-hydroxyethyl)-glycine/metal chelates represented by the formula: ##STR1## wherein R is H or alkyl (1-12C); M is Ti or Zr; k is a number in the range between 0 and 1, p is a...
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4884636 |
Delaying the gelation of water soluble polymers
A process is disclosed for delaying the rate at which water soluble polymers are gelled by an aldehyde and a phenolic compound and for increasing the mechanical strength of these gels which...
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4883605 |
Zirconium chelates and their use for cross-linking
A water-soluble zirconium chelate formed from a tetraalkyl zirconate and hydroxyethyl-tris-(hydroxypropyl) ethylene diamine, and use of the chelate as cross-linking agents in hydraulic fracturing...
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4865129 |
High temperature profile modification agents and methods for using same
A new and improved composition and method for profile modification of subterranean formations characterized by high reservoir temperatures and/or harsh brine conditions are disclosed. The new and...
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4858693 |
Compositions and methods for reducing the permeability of underground strata
Compositions and methods are used for reducing the permeability of high fluid permeability segments of underground strata, the compositions being injected into the high permeability segments in...
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4851143 |
Amino resin modified xanthan polymer gels for permeability profile 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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4845134 |
Gelable compositions and use thereof in steam treatment of wells
A gelable composition is provided which can be injected into a well prior to steam treatment of the well. The composition comprises water, a water-dispersible polymer, a water-dispersible first...
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