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4541489 |
Method of removing flow-restricting materials from wells
Flow-restricting materials containing epoxy resins present in a well treated with an epoxy resin, for the purpose of coating and consolidating unconsolidated sand adjacent the well and/or gravel...
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RE31946 |
Process for consolidating and sealing off geological and artificially deposited rock and earth formations
Waterglass solutions are mixed with polyisocyanates and these emulsions are then left to harden in the formations. Introduction of the mixture into the formations which are required to be...
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4527628 |
Method of temporarily plugging portions of a subterranean formation using a diverting agent
A method of temporarily plugging a subterranean formation using a diverting material comprising an aqueous carrier liquid and a diverting agent comprising a solid azo compound having an azo...
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4526695 |
Composition for reducing the permeability of subterranean formations
The present invention relates generally to the composition and method for reducing the permeability of subterranean formations penetrated by a wellbore. The composition of the present invention...
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4524829 |
Method of altering the permeability of a subterranean formation
The production of water from a subterranean formation is reduced by contacting the formation with a water dispersible hydrophilic organic polymer having a molecular weight greater than 100,000 and...
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4524828 |
Method of using thixotropic cements for combating gas migration problems
A thixotropic cement composition comprising water, hydraulic cement, a titanium chelate and a crosslinkable agent and methods of using same to combat migration of formation fluids in oil, gas and...
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4525103 |
Method of fixation of anchoring bolts in boreholes
Method for bonding of anchoring bolts in boreholes, in which an anchoring bolt is pushed with a rotary motion into a twin-chamber cartridge, one compartment of which is filled with a polyisocyanate...
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4521452 |
Gel-forming compositions and the use thereof
Preparation of polymeric gels, filaments, and films prepared by producing a uniform dispersion of a water soluble acrylamide polymer or copolymer in the water insoluble reaction product of certain...
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4518039 |
Method for treating subterranean formations
A method for treating a subterranean formation comprised of placing in or adjacent the formation a quantity of free-flowing, heat curable particles comprised of a high strength center, a coupling...
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4515216 |
Method of using thixotropic cements for combating lost circulation problems
Thixotropic cement composition comprising water, hydraulic cement, titanium chelates, and crosslinkable agents and methods of using same for sealing or cementing subterranean zones penetrated by a...
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4512407 |
Sand consolidation methods using adsorbable catalysts
Methods are provided for selectively consolidating sand grains within a subterranean formation. First an acidic zirconium salt catalyst, such as ZrOCl 2 , Zr(SO 4 ) 2 , or ZrCl 4 , is injected into...
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4510998 |
Fluid loss additive for well drilling
The present invention relates to a process for the plugging of a porous formation which may be encountered during the drilling of a well. The process entails plugging of the porous formation by...
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4505833 |
Stabilizing clayey formations
Process for treating a clayey geological formation to prevent, inhibit or reduce swelling or migrating of clay particles in a formation by treating the formation with an effective amount of a...
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4503912 |
Process for conformance control using a polymer flocculate
An aqueous solution containing a water soluble polymer and a nonalkaline aqueous solution containing a polyvalent cation are sequentially injected into the relatively highly permeable zones of a...
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4503170 |
Shear thickening fluid
The instant invention is directed to shear thickening fluids to prevent unwanted flow in wells penetrating subterranean formations. The shear thickening fluids comprise (1) a water swellable...
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4498539 |
Selective plugging of highly permeable subterranean strata by in situ _gelation of polymer solutions
A water permeability correction process, and composition therefor, to improve the sweep efficiency of waterflooding which involves the sequential injection of (1) an optional aqueous preflush slug...
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4498538 |
Method for maintaining the permeability of fines-containing formations
A method for treating formations which contain particulate fines to decrease movement of or swelling of the fines when a fluid passes through the formation, thus maintaining the permeability of the...
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4497596 |
Method of minimizing fines migration in a subterranean formation
A method of stabilizing fines within a permeable subterranean formation comprising contacting the fines with an effective amount of an organic polycationic polymer which contain two quaternary...
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4494606 |
Process for improving vertical conformance in a near well bore environment
An aqueous solution containing a high molecular weight organic polymer and an aqueous solution containing a cross-linking agent are sequentially injected into the near well bore environment of a...
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4489785 |
Method of completing a well bore penetrating a subterranean formation
A method whereby a conduit can be sealed within a subterranean formation utilizing a selected epoxy resin composition which upon setting forms a substantially crack-free, impermeable solid. The...
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4488601 |
Control of aluminum cross-linked polyacrylamides for sweep improvement
A method and fluid for selectively reducing the permeability of an oil-bearing subterranean formation is disclosed, wherein a cross-linkable polymer, a cross-linking agent and a spacer fluid are...
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4485875 |
Process for selectively plugging permeable zones in a subterranean formation
Highly permeable zones in a subterranean formation are selectively plugged by injecting an aqueous solution of an acrylamide polymer, a phenol and an aldehyde via a well into the highly permeable...
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4482015 |
Selectively plugging subterranean formations with a hydrocarbon soluble fluid
Highly permeable zones in a subterranean formation vertically bounded by a relatively less permeable zone are selectively plugged by injecting an emulsion of melamine and formaldehyde in an alcohol...
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4480693 |
Fluid loss control in oil field cements
The present invention relates to materials which reduce the filtration of fluid into permeable earth formations during cementing processes in the drilling and completing of subterranean wells,...
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4475847 |
Process for consolidation and sealing of geological formations and artificial beds of rock, earth, and coal
For consolidation of geological formations and artificial beds of rock, earth, and coal by means of foaming and hardening polyisocyanate/polyol blends, diols with secondary hydroxyl functions of...
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4475593 |
Method for profile control and conformance correction
Methods are provided for selectively placing a barrier to fluid flow within water rich strata or played out strata of a subterranean formation, the barrier being established at some distance remote...
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4474903 |
Hydrazide containing polymers
A method for reducing formation permeability comprising mixing (a) a homopolymer or copolymer of methyl acrylate or hydroxy alkyl acrylate, where the alkyl group is C 2 , C 3 or C 4 , into which...
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4473119 |
Process for selectively plugging subterranean formations with a melamine resin
Highly permeable zones in a subterranean formation are selectively plugged by injecting a melamine formaldehyde solution via a well into the highly permeable zones. The solution is water soluble...
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4461856 |
Aqueous hydraulic cement slurry
An aqueous hydraulic cement slurry is disclosed which comprises water, a hydraulic cement, a surfactant and, as a fluid loss additive, epihalohydrin derivatives of polyalkylenepolyamines.
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4461351 |
Process for partially or completely plugging permeable zones in a subterranean formation
Highly permeable zones in a subterranean formation are selectively plugged by injecting an aqueous solution of urea, an aldehyde and an acrylamide polymer via a well into the highly permeable...
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4461352 |
Process for selectively plugging a subterranean formation with a polymer gel
The highly permeable zones of a subterranean formation are selectively plugged by injecting an aqueous solution of an acrylamide polymer, an aldehyde and a borate salt via a well into the highly...
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4460751 |
Crosslinking composition and method of preparation
A crosslinking composition and method of preparing the crosslinking composition. The crosslinking composition comprises a zirconium compound having a valence of +4, an alpha-hydroxy acid, and an...
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4452551 |
Process for stabilizing rock and coal formations by bonding these formations to themselves or other geological formations
The invention relates to a process for stabilizing rock and coal formations by bonding them to each other or to other geological formations. The bonding material is a reactive organic...
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4444265 |
Drain hole drilling
A method for enhancing the recovery of liquid products from a wellbore having at least one laterally extending drain hole wellbore extending therefrom wherein a portion of the earth around the...
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4438976 |
Method of repair of short circuits for in situ leaching
In an acidic in situ leaching system, a short circuit passage through a subterranean formation between a fracture associated with an injection well and a fracture associated with a production well...
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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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4428426 |
Method of placing and consolidating a mass of particulate material and composition for use in carrying out said method
Sand grains coated with a solid non-cured epoxy resin with a softening point above 35° C. are placed in a well for gravel pack, well repair or fracturing purposes. The epoxy resin softens at...
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4425968 |
Selective water exclusion
A method is disclosed for selectively reducing the permeability of water producing intervals in a hydrocarbon formation without reducing oil permeability. A soluble oil followed by water is...
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4417625 |
Annulus plugging
A method of plugging an elongate annulus, particularly an annulus in an oil well in which a blow-out is occurring, consists in the steps of securing hot tapping apparatus to an outer tubular member...
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4413680 |
Permeability reduction in subterranean reservoirs
A method for selectively reducing the permeability of the higher permeability zones of a subterranean reservoir having heterogeneous permeability, such permeability reduction occurring a...
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4413931 |
Method for treating subterranean formations
Subterranean geological formations such as those surrounding oil well bore holes, are treated by placing in or adjacent the formation a particulate material coated with a two-step, curable,...
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4406499 |
Method of in situ bitumen recovery by percolation
Bitumen is recovered from an underground tar sands (oil sands) formation by an in-situ percolation process. After drilling a borehole to the bottom of the tar sand formation, the hole is enlarged...
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4402633 |
Method of installing a rock bolt
A method for fastening rock bolts in geological strata and a two-compartment package containing expansible resinous composition including unsaturated polyester resin syrup, aluminum chlorohydroxide...
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4391925 |
Shear thickening well control fluid
The instant invention is directed to shear thickening fluids which comprise a water swellable clay capable of rapidly forming a paste having a strength of at least 2000 lbs/100 ft 2 upon...
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4386806 |
Well repair for in situ leaching
A permeable region adjacent a well bore used in an acidic in situ leaching system can be repaired by introducing a non-acidic liquid for displacing acidic leach liquid from the permeable region,...
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4385132 |
Process for the sealing of constructions
The present invention is directed to a process for sealing fissures and leaks in construction by pressing sealing agents comprising liquid compounds having free isocyanate groups, and optionally...
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4383054 |
Hydrophilic high polymers prepared from aqueous solutions or dispersions of polyoxypropylene polyamine N-N'-polymethylene sulfonates
A self curing aqueous solution/dispersion comprising about 50-70 wt. % water, about 25-35 wt. % of a novel N-polymethylene substituted polyoxypropylene polyamine and about 3-9 wt. % of a curable...
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4378049 |
Methods, additives and compositions for temporarily sealing high temperature permeable formations
Methods, additives and compositions for selectively temporarily sealing high temperature permeable formations penetrated by well bores. The compositions are formed by dispersing a granular additive...
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4365670 |
Methods of forming isocyanate polymers for earth-sealing operations
Methods of sealing particular areas, including subterranean well formations, are provided wherein the methods utilize an isocyanate polymer suitable as a sealing agent having a controllable...
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4366194 |
Rendering porous structures impermeable by treatment with pH insensitive gelable compositions of amide polymers and composition
Aqueous solutions of amide polymers, such as polyacrylamide when treated with small amounts of a water-soluble polyaldehyde and a hypohalite salt at an alkaline pH, react to form firm gels within a...
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