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3868998 |
SELF-ACIDIFYING TREATING FLUID POSITIONING PROCESS
The positioning of a treating fluid such as an acidifying or particle-carrying fluid, in a subterranean location is improved by injecting a viscous aqueous solution that contains a cellulose ether,...
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3868996 |
Buffer-regulated treating fluid positioning process
The positioning of a treating fluid, such as an acidifying and/or particle-carrying fluid, in a subterranean location is improved by injecting a viscous, aqueous solution that contains a cellulose...
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3861465 |
METHOD OF SELECTIVE FORMATION TREATMENT
A selective formation treatment tool is run into a well and has a retrievable packer which is set in a well casing above perforations in the casing, and a washing or treating fluid tool has opposed...
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3858655 |
TREATING A SUBTERRANEAN HYDROCARBON-CONTAINING FORMATION
A method for treating a preselected portion of a subterranean hydrocarbon formation penetrated by at least one well bore to free the formation of oxygen and provide a water-wet matrix.
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3853771 |
PROCESS FOR DISPERSING CELLULAR MICRO-ORGANISMS WITH CHELATING AQUEOUS ALKALINE SURFACTANT SYSTEMS
A contaminant composed of cellular micro-organism materials is dissolved or dispersed by contacting it with an aqueous solution containing at least one surfactant adapted to disperse the outer wall...
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3850477 |
CHEMICAL COMMINUTION AND MINING OF COAL
Coal, whether in a sub-surface stratum or in large lumps as mined by standard means is reduced to fragments by treatment with compounds which weaken interlayer forces at natural interfaces present...
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3847223 |
RETRIEVABLE FLUID CONTROL VALVE AND METHOD
A normally closed retrievable valve assembly for positioning within a tubing string located in a bore hole. The valve assembly includes a piston, responsive to the pressure of the fluid in the...
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3842912 |
METHOD AND APPARATUS FOR DEEP GAS WELL COMPLETIONS
A tubular assembly having spaced-apart receptacles with polished bores is disposable in a well bore cementing dementing in place with the receptacle bores disposed above and below a producing...
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3842911 |
METHOD OF FRACTURE ACIDIZING A WELL FORMATION
The present invention relates to an improved method of fracture acidizing underground well formations so that the production of oil and gas therefrom is increased. By the method of the present...
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3835928 |
METHOD OF CREATING A PLURALITY OF FRACTURES FROM A DEVIATED WELL
This specification discloses a method of forming from a deviated well a plurality of vertically disposed fractures spaced a substantial distance apart in a subterranean formation having a known...
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3831679 |
STIMULATION WITH INHIBITED ACIDIZING FLUIDS
Production and injection wells are stimulated with an inhibited acidizing microemulsion containing hydrocarbon (external phase), surfactant, and acid. The acid is inhibited from reacting with the...
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3819520 |
MIXED ALCOHOLS IN WELL ACIDIZING
A mixture of an octanol and a lower alcohol is used with, ahead of, or behind aqueous acid solutions employed to acidize wells.
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3807500 |
METHOD OF TREATING SUBTERRANEAN FORMATIONS TO IMPROVE PERMEABILITY
A method for treating subterranean formations containing water sensitivity clays which have sustained permeability damage due to contact with fresh water, to increase the permeability of the...
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3799266 |
FRACTURING METHOD USING ACID EXTERNAL EMULSIONS
A subterranean carbonate formation is treated by injecting into the formation an emulsion comprising an aqueous acid solution as the external phase and a hydrocarbon oil as the internal phase. The...
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3794117 |
TREATMENT OF SANDSTONE FORMATIONS
The present invention provides a method of treating a subterranean sandstone formation with an aqueous acid solution containing hydrofluoric acid wherein the reaction rate of the acid with the...
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3789927 |
TREATMENT OF GRAVEL PACKED FORMATIONS
The treatment of formations, which have been previously packed with gravel, with, for example, an acidizing liquid can be improved by employing as a diverting agent in said treatment fluid...
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3782471 |
DISPERSING CELLULAR-MICRO-ORGANISMS WITH CHELATING AQUEOUS ALKALINE SURFACTANT SYSTEMS
A contaminent composed of cellular micro-organism materials is dissolved or dispersed by contacting it with an aqueous solution containing at least one surfactant adapted to disperse the outer wall...
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3779916 |
ACIDIZING COMPOSITION
An acid-in-oil emulsion having a greatly enhanced retardation rate is prepared by employing in the emulsion a mixture of an effective amount of an oil wetting surfactant, e.g., a saturated...
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3773465 |
INHIBITED TREATING ACID
The present invention is directed to an inhibited treating acid for use in contact with ferrous surfaces at temperatures of from about 150°F to about 450°F.
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3770058 |
METHOD OF INTRODUCING FLUID TREATMENT TO A WELL
The disclosure is of a seal to be used in a well immediately above a pump and at or below the normal level of the water in the well casing to prevent the movement of water and air downwardly past...
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3768561 |
METHOD FOR CONTROLLING UNCONSOLIDATED SAND IN AN OIL WELL WITH PERMEABLE CEMENT
The movement of unconsolidated sand from a subterranean hydrocarbon-containing formation into a wellbore during recovery of the formation hydrocarbon fluids is prevented by forming a permeable,...
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3765484 |
METHOD AND APPARATUS FOR TREATING SELECTED RESERVOIR PORTIONS
Selected portions of a subterranean reservoir are treated by seating a packer that forms a slideable seal above a perforated section of well casing and repetitively sealing and moving a...
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3760881 |
TREATMENT OF WELLS WITH FLUIDS CONTAINING COMPLEXES
A subterranean formation surrounding a wellbore is treated by injecting into the formation a water-based viscous fluid containing a complex produced by the reaction of an aliphatic quaternary...
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3757863 |
SECONDARY RECOVERY METHODS
A method for reducing the quantity of water recovered from a subterranean formation which is penetrated by at least one well bore wherein prolonged mobility control and/or plugging is maintained...
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3756319 |
METHOD FOR STIMULATING THE PRODUCTION OF OIL FROM A PRODUCING WELL
A method for stimulating the production of oil from a well completed in a permeable, oil-bearing formation comprising the steps of (1) contacting the well with a substantially anhydrous soluble oil...
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3754599 |
USE OF MICELLAR SOLUTIONS TO IMPROVE PERFORATING PROCESS
A process of perforating an oil-bearing subterranean formation wherein the perforations in the reservoir are caused by a hole-producing apparatus, the improvement comprising perforating the...
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3747681 |
HYDRAULIC FRACTURING PROCESS USING POLYETHYLENE OXIDE BASED FRACTURING FLUID
A formation is fractured by injecting at a pressure sufficient to fracture the formation an aqueous solution containing about 0.005 - 10 percent by weight of a high molecular weight (e.g., 50,000...
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3743017 |
USE OF FLUIDIC PRESSURE FLUCTUATION GENERATOR TO STIMULATE UNDERGROUND FORMATIONS
This invention concerns the use of a fluidic pressure fluctuation generator in a well bore to stimulate a subsurface formation. The generator is connected to the lower end of a string of tubing or...
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3734186 |
METHOD FOR ACIDIZING SUBTERRANEAN FORMATIONS
A method for acidizing a carbonate formation surrounding a well wherein a treating fluid containing an acid which on reaction with the carbonate rock forms a soluble salt and an organic acid which...
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3730275 |
METHOD USING LOW FRICTION LOSS LIQUID COMPOSITION HAVING RESISTANCE TO SHEAR DEGRADATION
A method of reducing the shear degradation when pumping through conduits, such as well tubing during hydraulic fracturing operations and pipelines, a liquid containing a friction loss reducing...
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3727689 |
HYDRAULIC FRACTURING
Improvements in hydraulic fracturing of underground porous formations penetrated by a well bore are accomplished by the use of fracturing fluids comprising aqueous gels prepared from water or...
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3724552 |
WELL TREATING METHOD TO REMOVE PARAFFIN DEPOSITION
This specification discloses a method of treating a well having an oil column therein and penetrating an oil-containing subterranean formation to dissolve paraffin deposits from the well and the...
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3722594 |
WELL METHODS USING SMALL DIAMETER TUBING
Well methods using small diameter tubing introduced into and withdrawn from the well by an injector apparatus. The tubing is introduced into and withdrawn from the well by the injector from a...
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3718186 |
METHOD AND APPARATUS FOR FORMING AND/OR AUGMENTING AN ENERGY WAVE
A method in which an energy wave at a controlled frequency is superimposed on another energy wave transmitted through some medium to increase the energy level and heat the medium through which the...
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3712380 |
METHOD FOR REWORKING AND CLEANING WELLS
A method for reworking and cleaning a well which comprises the steps of setting a packer in the well bore above the formation surrounding the well bore to be treated, inserting tubing through the...
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3708014 |
HYDROCHLORIC ACID/HYDROFLUORIC ACID TREATMENT TO REMOVE ASBESTOS FIBERS FROM A WELL BORE
An aqueous mixture of hydrochloric acid and hydrofluoric acid is employed to accomplish the 98 percent disintegration of chrysotile asbestos. In a specific embodiment an aqueous mixture of...
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3707192 |
TWO-STAGE INJECTION OF ACID-PRODUCING CHEMICALS FOR STIMULATING WELLS
The flow capacity of a subsurface formation penetrated by a well is increased by fracturing the formation, extending the fracture from the well outward into the formation, depositing solid...
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3700280 |
METHOD OF PRODUCING OIL FROM AN OIL SHALE FORMATION CONTAINING NAHCOLITE AND DAWSONITE
A new and improved method of recovering hydrocarbons and dawsonite decomposition products from a subterranean oil shale formation containing substantial amounts of nahcolite and dawsonite...
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3688829 |
REMOVING SCALE FROM OIL WELLS
A workover process for removing calcium sulfate scale from oil wells includes introducing into the well and into contact with the scale an aqueous solution of sodium or potassium gluconate and...
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3687203 |
METHOD OF INCREASING WELL PRODUCTIVITY
A substantially vertical fracture in a well formation is partially filled to prevent healing of the fracture, and the unfilled portion of the fracture is utilized for production flow.
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3651868 |
REMOVAL OF CALCIUM SULFATE DEPOSITS
A method of removing calcium sulfate deposits comprising contacting such deposits first with a pressurized solution of ammonia and carbon dioxide in water and next with water or an aqueous acid...
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3648775 |
CHROMIC ACID INJECTION FOR WELL STIMULATION
The relative permeability to the flow of water in a reservoir having substantially most of the mobile oil removed therefrom is improved by contacting the reservoir with an aqueous solution of...
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3648776 |
STIMULATING PRODUCING WELLS WITH CHROMIC ACID
The productivity index of a well in fluid communication with a reservoir is improved by injecting into the reservoir a displacing fluid to remove substantially all of the mobile oil from the...
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3642068 |
FORMATION FRACTURING
This specification discloses a fracturing process in which a fracture formed in a formation is acid etched near the well and particle propped in the more remote portions of the fracture. A fracture...
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3640344 |
FRACTURING AND SCAVENGING FORMATIONS WITH FLUIDS CONTAINING LIQUEFIABLE GASES AND ACIDIZING AGENTS
A method of fracturing formation with liquefiable gases, liquefiable gases and acidizing agents, and cleansing and scavenging of formations whereby energy waves and high-frequency vibrations may...
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3633672 |
INHIBITION OF DEPOSITION OF SCALE
Long term inhibition of the deposition or accumulation of inorganic scale in operations concerned with working or treating, or producing from, an underground reservoir is attained by employing an...
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3630285 |
ACIDIZING HIGH-TEMPERATURE WELLS
A high-temperature earth formation is acidized by injecting down a well and into the formation a water-soluble ester of an organic carboxylic acid which forms a calcium salt which is also...
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3627045 |
METHODS FOR COMPLETING WELLS TRAVERSING EARTH FORMATIONS
This application discloses new and improved methods for completing wells having earth formations which are to be fractured, acidized, or treated for inhibiting the production of unconsolidated...
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3625284 |
STIMULATION OF WATER INJECTION WELLS WITH MICELLAR DISPERSIONS
Stimulation of water injection wells is accomplished by injecting into the well 1-500 gallons of acid followed by the injection of 1-500 gallons of a micellar dispersion, the gallons of acid and...
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3612179 |
METHOD OF STIMULATING WELL PRODUCTION
The method of stimulating the production of wells by injecting a body of acid solution into a portion of the earth's formation traversed by a well bore, the acid solution being displaced into the...
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