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4536222 |
Method for removing or retarding paraffin buildup on surfaces in contact with natural gas
A sulfur trioxide-containing fluid, e.g., sulfur trioxide gas, is contacted with the surfaces of equipment in contact with crude oil or natural gas to retard the deposition of paraffins from the...
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4407367 |
Method for in situ recovery of heavy crude oils and tars by hydrocarbon vapor injection
The recovery of heavy crude oils and tars from subterranean oil bearing formations is enhanced by the injection of pressurized and heated hydrocarbon vapor into a single well drilled into the...
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4399868 |
Unplugging brine-submerged perforations
Fluid passageways between a well borehole and a subterranean reservoir which are both plugged and submerged within relatively dense brine can be contacted with heat and oil solvent by arranging a...
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4387016 |
Method for extraction of bituminous material
A process for separating and recovering bituminous material from tar sand and other viscous petroleum deposits, either in-situ or after mining the deposits. The process may also apply to heavy oil...
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4380268 |
Petroleum and gas well enhancement agent
Recovery of gas and oil is enhanced by the removal of paraffin and other hydrocarbons from wells by flushing the wells with water containing a polymer of a primary alcohol and ethylene oxide plus...
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4379490 |
Method for removal of asphaltene depositions with amine-activated disulfide oil
A method for treating and removing unwanted asphaltene deposits from oil and gas wells, surface equipment, flow lines, and pore spaces of oil-baring formations comprises treatment with an...
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4372383 |
In situ separation of bitumen from bitumen-bearing deposits
A method for in situ separation of bitumen from bitumen-bearing subterranean deposits includes the step of injecting a solvent composition into the deposit. The solvent composition must have an...
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4328865 |
Wax control in oil wells using a thermal syphon system
This invention relates to a system for controlling wax formation in oil wells using a thermal syphon wherein a confined annular space between the production tube and the oil string casing is...
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4224993 |
Dewaxing valve for use in oil wells
The dewaxing valve comprises a ball and valve seat where the ball is on the upstream side of the flow of hot dewaxing fluid through a production pipe string to the well annulus. The design of the...
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4207193 |
Methods and compositions for removing asphaltenic and paraffinic containing deposits
Asphaltenic and paraffinic containing deposits are removed by contacting the deposits with an aqueous dispersion of a hydrocarbon solvent, an amine and a nonionic alkylated aryl polyether alcohol.
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4090562 |
Method and solvent composition for stimulating the production of oil from a producing well
A method and solvent composition for removing viscous crude oil, waxes, asphaltenes and resin precipitates of petroleum origin from oil wells, flow lines and pore spaces of oil-bearing formations....
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4049057 |
Paraffin cleaner
A valve unit is placed in the eduction tube of an oil well. The unit has two valves therein, one to discharge fluid from the eduction tube into the annulus between the tube and the casing and the...
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4045360 |
Inhibiting wax deposition from a wax-containing oil
A method for inhibiting the deposition of wax onto a solid surface from wax-containing petroleum and other wax-containing oils in contact with such solid surface comprising adding to such oils a...
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4037660 |
Method for steam cleaning liners in oil well bores
Method and means for steam cleaning subsurface liners in oil well bores and the like, comprising steam head means particularly designed and constructed for radially spreading a steam stream through...
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4033411 |
Method for stimulating the recovery of crude oil
There are disclosed several embodiments of a method for stimulating the recovery of crude oil from a formation penetrated by a well bore. In each embodiment, a mixture of the vapors of a solvent...
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4027731 |
Methods of and apparatus for hydrocarbon recovery
Methods of and apparatus for recovering hydrocarbons from tar sands, oil shales, exhausted oil bearing formations and the like by solvent extraction.
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4011906 |
Downhole valve for paraffin control
Method and apparatus for removing paraffin deposits from the production tubing of an oil well. A sub is series connected into the production string at a location below the area where deposition of...
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4005020 |
Paraffin removing compositions
A composition comprising a basic solution of oxyalkylated materials wherein at least one of the oxyalkylated materials is an oxyalkylated amine and at least one of the oxyalkylated materials...
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3970148 |
Method for stimulating wells completed in oil bearing earth formations
A method for cleaning and stimulating an oil, gas or injection well, in which wax, tar and/or bituminous materials are either already deposited or would be precipitated by the injection of an...
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3957659 |
Crude oil compositions having improved low temperature flow properties
The flow properties of waxy crude oils are improved by the incorporation therein of a copolymer of (1) an olefinically unsaturated compound containing a long hydrocarbon side chain and (2) an...
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3951828 |
Process of injecting a micellar dispersion into a subterranean reservoir
The injectivity of micellar dispersions containing wax within the hydrocarbon phase is improved by incorporating into this phase about 0.01-10 percent by weight of a low molecular weight paraffinic...
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3941192 |
Method for recovering high asphaltene content petroleum using surfactants
Surfactant flooding is frequently ineffective for recovering highly asphaltic petroleum because the asphaltic constituents of the petroleum have a strong affinity for the mineral surfaces such as...
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3908763 |
Method for pumpin paraffine base crude oil
The method of inducing and maintaining the flow of paraffine base oil in a well structure which comprises heating and maintaining the well structure at a temperature below the fracturing and...
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3837402 |
PROCESS FOR REMOVING OIL FROM AROUND A WELLBORE
Chemical combination of 1] the reaction of fatty acid with diethanolamine, and 2] ingredient to enhance such reactant's solubility in water, the combination then, on dilution being used to...
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3835927 |
PROCESS OF REMOVING SULFUR FROM FLUIDS
A method of inhibiting, preventing, reducing, and/or reversing sulfur plugging which comprises treating sulfur-containing fluids in oil and gas wells, such as petroleum (and/or fluids containing a...
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3777820 |
LPG INJECTION WITH SURFACTANT FOR RELIEVING PERMEABILITY BLOCKING
Introduction of mixture of LPG and surfactant for relieving blocking of well.
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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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3729053 |
METHOD FOR INCREASING PERMEABILITY OF OIL-BEARING FORMATIONS
Water injection wells are treated to increase their injectivity by first introducing a solvent such as carbon disulfide, carbon tetrachloride or a composition rich in monocyclic aromatics, into the...
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3724553 |
PARAFFIN WELL TREATMENT METHOD
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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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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3722592 |
PARAFFIN DEPOSITION INHIBITION IN OIL
A method for inhibiting the deposition of paraffin in liquid oil either in the oil well, gas wells, etc., or on the earth's surface by utilizing a stable aqueous emulsion of polyethylene wherein...
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3693719 |
PROCESS FOR PARAFFIN REMOVAL FROM HYDROCARBON-BEARING FORMATIONS
Solid paraffin-like hydrocarbon materials derived from petroliferous fluids which have been deposited in hydrocarbon-bearing formations are removed by introducing into the formation in the vicinity...
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3693720 |
CRUDE OIL RECOVERY METHOD USING A POLYMERIC WAX INHIBITOR
The recovery of crude oil may be improved by inhibiting deposition of wax from the oil. Wax deposition may be inhibited by adding to the oil a polymer having pendant polar and non-polar moieties,...
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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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3682249 |
METHOD FOR INHIBITING THE DEPOSITION OF WAX FROM WAX-CONTAINING SOLUBLE OILS AND MICELLAR DISPERSIONS AND SOLUBLE OIL AND MICELLAR COMPOSITIONS INHIBITED THEREBY
A method for inhibiting the deposition of wax from wax-containing soluble oils and micellar dispersions in which a small amount of a was deposition inhibitor comprised of a copolymer of ethylene...
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3670819 |
PROCESS FOR TREATMENT OF WATER INJECTION WELLS
Water injection wells are stimulated by an oil-external micellar slug preceded and/or followed by at least one micellar (buffer) slug of a higher water content. This series of slugs is forced out...
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3669189 |
METHOD FOR INHIBITING THE DEPOSITION OF WAX FROM A WAX-CONTAINING OIL
A method for inhibiting the deposition of wax from wax-containing petroleum and other wax-containing oils in which a small amount of a wax deposition inhibitor comprised of a copolymer of ethylene...
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3640824 |
PARAFFIN INHIBITOR IN CRUDE OIL WITH HIGH-MOLECULAR WEIGHT HIGHLY BRANCHED POLYETHYLENE
A paraffin inhibitor for use in treating crude oil which contains as the essential ingredient in an amount effective to inhibit paraffin deposition, polyethylene having a molecular weight in excess...
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3574319 |
PARAFFIN CONTROL METHOD
A method for controlling paraffin deposition in an oil production system and includes injecting an asphaltic crude oil into paraffin base crude oil production and storage facilities. The invention...
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3563315 |
WELL CLEANING METHOD
Removal of corrosion-inhibiting film from metal surfaces by solvents containing carbon disulfide is prevented by including a small amount of the inhibitor in the solvent.
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3542130 |
VALVE FOR REMOVING PARAFFIN FROM OIL WELLS
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3533470 |
OIL WELL TREATMENT
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3531409 |
SOLID SOLUTIONS OF CORROSION INHIBITORS FOR USE IN TREATING OIL WELLS
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3481870 |
COMPOSITION AND METHOD FOR INHIBITING THE FORMATION OF IN AND REMOVING FROM OIL WELLS AND PIPELINES DEPOSITS OF PARAFFIN AND PARAFFINLIKE DEPOSITS
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3477513 |
WELL CLEANING WITH MIXED LIQUEFIED PROPANE AND BUTANE SOLVENT
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3456735 |
METHOD FOR COMPLETING WELLS TO PREVENT PARAFFIN DEPOSITS
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3455391 |
PROCESS FOR HORIZONTALLY FRACTURING SUBTERRANEAN EARTH FORMATIONS
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3454464 |
RESTRICTING PARAFFIN FORMATION IN PRODUCING WELLS
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3448034 |
FLUID STABILIZER
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