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4507440 |
Cross-linkable and cross linked macromolecular compositions wherein cross-linking is by structural bridges of the formula --NR.sup.x --CHN--CO-- and their preparation
The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula --NR x --CHN--CO--. This novel bridge is obtained by reacting a macro-molecule,...
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4500437 |
Water soluble copolymers for use in fracture-acidizing of wells
New copolymers soluble in water and aqueous acids are disclosed comprising in a statistical distribution in the macromolecule at least 5% by weight of entities containing a formylamino...
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4498536 |
Method of washing, injecting swabbing or flow testing subterranean wells
A method of chemical injection and of swabbing and/or flow testing a subterranean well by interconnecting a resettable packer and a circulating wash tool so that the packer may be positioned and...
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4499232 |
Water soluble, crosslinkable polymer compositions, their preparation and use
The present invention relates to macromolecular compositions crosslinked by a novel bridge having the formula --NR x --CHN--CO--. This novel bridge is obtained by reacting a macro-molecule,...
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4495996 |
Method for scale removal and scale inhibition in a well penetrating a subterranean formation
A method for removing scale and inhibiting the formation of scale in a well penetrating a subterranean formation for the production of fluids from the formation, the method comprising; (a)...
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4487867 |
Water soluble anionic polymer composition and method for stimulating a subterranean formation
A composition and method for stimulating a subterranean formation. The composition contains an anionic polymer which is readily dispersible in water, having a molecular weight sufficient to...
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4487265 |
Acidizing a subterranean reservoir
The permeability of subterranean hydrocarbon-producing reservoirs is increased by introducing therein a mixture containing a tertiary carboxylic acid alkylated amide and a glycol ether in...
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4487860 |
Aqueous self-curing polymeric blends
The composition comprises an aqueous polyelectrolyte polymer intermixed with a phosphated polymer and a self-curing water dispersed polymer containing copolymerized functional monomer and alkylol...
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4482016 |
Acidizing with chemically heated weak acid
Materials in and around a well are acidized with chemically heated, hot acid by injecting a solution of both nitrogen and heat generating reactants and a mixture of weak acid and weak acid salt...
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4480691 |
Recycled fatty acid crude petroleum recovery process
A method of recovering crude oil for subsequent processing. The method contemplates the step of exposing the source of crude oil such as a subterranean petroleum reservoir or a vessel or container...
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4479543 |
Method for deeper penetrating acidizing of siliceous formations
A method for acidizing siliceous subterranean formations wherein the acidizing composition penetrates the formation to a greater extent before spending comprising injecting into the formation first...
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4476033 |
Method and compositions for acidizing and fracturing wells
Gelled-acid compositions suitable for matrix-acidizing or fracture-acidizing of subterranean formations and methods of using the composition in these operations are provided wherein the...
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4467867 |
Subterranean well safety valve with reference pressure chamber
A subsurface safety valve for use in subterranean oil and gas well which is actuated by pressure fluctuations in the tubing-casing annulus is disclosed. The safety valve assembly consists of a...
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4466893 |
Method of preparing and using and composition for acidizing subterranean formations
A composition and method of acidizing or fracturing a subterranean formation comprising contacting the formation with a composition comprising an acid, urea, and a selected gelling agent. The urea...
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4464246 |
Reagent and process for recovering oil and kerogens from oil shale
A process and reagent for the recovery of kerogen and oil from associated substrate solids and for producing pumpable liquid from high molecular weight, high viscosity crude oils in which a reagent...
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4464268 |
Method for restoring permeability of injection wells
A method is disclosed for restoring permeability of injection wells which have become plugged with polymer residue, protein debris, biological matter and the like. The method includes treating the...
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4462718 |
Oil well treating method and composition
A particular simple method and class of organic polycationic polymer compositions are provided for treating earthen formations such as in oil wells to stabilize clay against dispersion and...
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4454917 |
Thermal acidization and recovery process for recovering viscous petroleum
A thermal acidization and recovery process for increasing production of heavy viscous petroleum crude oil and synthetic fuels from subterranean hydrocarbon formations containing clay particles...
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4453596 |
Method of treating subterranean formations utilizing foamed viscous fluids
A method of treating a subterranean formation penetrated by a well bore comprising injecting a gelled foamed fluid into said formation. The gelled foamed fluid is prepared by foaming an admixture...
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4453597 |
Stimulation of hydrocarbon flow from a geological formation
Means are provided for increasing the productivity of a hydrocarbon formation by modifying the formation in the vicinity of the borehole by a succession of treatments utilizing a first fluid which...
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4436156 |
Method of treating well formations employing foamed treatment fluids
A method for placing a foamed treating fluid in the upper portion of a fracture comprising the steps of: (i) introducing a foamed preflush fluid into the fracture; (ii) introducing an inert gas...
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4431057 |
Process and device for injecting a liquid agent used for treating a geological formation in the vicinity of a well bore traversing this formation
A technique for liquid treating a geological formation comprises spraying the liquid with a pressurized carrier gas, using a spraying pipe whose length and diameter are adjusted as a function of...
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4428432 |
Method for stimulating siliceous subterranean formations
Wells of subterranean siliceous formations containing hydrocarbons are stimulated by the injection of crosslinked acid polymers wherein the polymer is a polysaccharide selected from the group...
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4426296 |
Method of acidizing wells using gelled acids
The permeability of siliceous or calcareous subterranean formations adjacent a wellbore is increased by contacting the formation with a gelled aqueous acid capable of dissolving mineral...
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4414118 |
Method and compositions for dissolving silicates in subterranean formation
A method and composition to dissolve siliceous material in a subterranean formation. The composition of the invention is an aqueous acidic solution having a pH no greater than 2 and comprised of at...
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4400034 |
Coal comminution and recovery process using gas drying
This invention is a comminution process for treating coal with a drying gas to form fractures which weaken the structure of the coal and make it easier to disintegrate mechanically, chemically or...
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4391327 |
Solvent foam stimulation of coal degasification well
A foamed fluid containing a coal solvent is injected into a coal seam to improve the gas permeability of the coal.
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4381035 |
Simultaneous recovery of thermal values and organic materials from solid carbonaceous fuels and waste disposal process
A process for recovering thermal values and organic materials from solid carbonaceous fuels, i.e., bituminous coals and lignites, by contacting such fuels with waste foul condensates, known as...
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4368922 |
Method for solution mining of complex carbonaceous materials
Underground coal is mined by sinking a hole into the coal, passing a coal solvent to the coal, and recovering a coal solution and/or dispersion products from the resulting solution or suspension.
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4359391 |
Well treatment with emulsion dispersions
In a method of treating a subterranean formation, a well treatment composition comprising a dispersion of a water-in-oil emulsion in an aqueous medium is injected into the formation. The...
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4345652 |
Process for improving the permeability of ground formations, adapted to the production of high temperature geothermic energy
This process comprises the three successive following steps of: (a) injecting into a formation a solution of sodium or potassium hydroxide during a limited time interval to perform a chemical...
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4332688 |
Aqueous acid solution containing an acrylamido alkanesulfonic acid polymer
Significant improvement in the recovery of hydrocarbons from a subterranean hydrocarbon-bearing formation is accomplished by injecting into the formation via an injection well drilled into a...
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4324668 |
High viscosity acidic treating fluids and methods of forming and using the same
High viscosity acidic treating fluids comprised of aqueous acid solutions containing zirconium cross-linked hydrophilic organic polymers are provided having improved viscosity and temperature...
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4324669 |
Foamed high viscosity aqueous inorganic acid solutions and methods of using the same
Foamed high viscosity aqueous inorganic acid solutions and methods of treating subterreanean well formations using such solutions are provided. The foamed acid solutions are comprised of water, at...
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4322306 |
Retarding acidizing fluids
Methods of chemically retarding the reaction rates of acidizing fluids on calcareous formations and chemically retarded acidizing compositions are provided.
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4320014 |
Acidification of subterranean formations employing halogenated hydrocarbons
The in situ production of hydrochloric acid in a subterranean formation to increase the flow of gas or oil therefrom by decomposing a polyhalohydrocarbon in the formation is accomplished at lower...
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4317735 |
Method of inhibiting crosslinking of aqueous xanthan gums in the presence of ferric acid ions
Aqueous xanthan gums normally crosslink at a pH greater than about 1.5 in the presence of ferric ions. This phenomenon is undesirable under many conditions of use, such as acidizing treatments of...
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4314608 |
Method and apparatus for well treating
A method and apparatus are disclosed for sequentially treating two vertically separated zones in a well bore, utilizing a packer having a fluid passageway therethrough set between the zones, a...
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4304676 |
Methods and compositions for dissolving silicates in subterranean formations
Hydrofluoric acid compositions and methods for dissolving siliceous materials in subterranean formations to stimulate the production of fluids therefrom are provided. The presence of aluminum in...
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4290901 |
Demulsifier for inclusion in injected acidization systems for petroleum formation stimulation
The formation of stable oil-in-water emulsions in produced fluids from wells undergoing acidization treatment is prevented by the inclusion within the injected acidization chemical mixture of a...
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4290485 |
Reduction of water production from hydrocarbon containing subsurface formations
To reduce the production of water from a subsurface hydrocarbon-bearing interval of a formation the producing interval of the formation is treated with an aqueous solution or sol of a high...
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4288332 |
Methods and compositions for treating subterranean formations
Methods and compositions for treating subterranean formations whereby the loss of formation adsorbable additives from the treating compositions is reduced or prevented by including in such...
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4282929 |
Method of controlling scale in oil recovery operations
Disclosed is a method of producing highly viscous minerals from a subterranean formation by injection of an acidic, thermal vapor stream without substantial scale buildup in downstream piping,...
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4283089 |
Pretreatment for fracturing coal seams
A pretreatment for use in fracturing coal seams to increase gas permeability of the seams. The pretreatment involves injecting a material capable of swelling coal into a coal seam prior to...
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4279304 |
Wire line tool release method
A wire line well tool is connected to a fluid gun which is run into the hole along with the tool. Should the tool become stuck, the gun is actuated, e.g. electrically, to direct mud active fluid...
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4279305 |
Process for stimulating a well with a saline surfactant sulfate, alkanol and acid system
The injectivity of an oil-containing reservoir is increased by injecting successive portions of a solution or slightly turbid dispersion of reservoir-tailored amounts of polyalkoxyalcohol sulfate...
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4273191 |
Simultaneous oil recovery and waste disposal process
A process for recovering oil from oil containing masses and formations by contacting such oil bearing masses with waste foul condensates, known as black liquor, from paper and pulping operations,...
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4270609 |
Tar sand extraction process
A method for separating and recovering bitumen from tar sand and other viscous petroleum deposits, either in situ or after mining the deposits. The method may also apply to heavy oil wells and to...
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4261421 |
Method for selectively acidizing the less permeable zones of a high temperature subterranean formation
The less permeable zones of subterranean formations having temperatures above about 250° F. are acidized by selectively plugging the more permeable zones with acid-soluble particulate diverting...
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4260020 |
Method and tool for controlling fluid flow from a tubing string into a low pressure earth formation
A tool is disclosed for controlling flow of treating fluid from a tubing string into an earth formation, in which the bottom hole pressure is less than the hydrostatic pressure of the fluid in the...
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