Matches 101 - 150 out of 251 < 1 2 3 4 5 6 >
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5400430 Method for injection well stimulation  
A method of stimulating injection wells having a wellbore. The method includes the steps of placing a heater at or near the bottom of the well, adjacent to the area to be treated, energizing the...
5388644 Application of N,N-dialkylamides to reduce precipitation of asphalt from crude oil  
A method of reducing, preferably preventing, precipitation of asphalt from crude oil. In one aspect, crude oil is contacted in the borehole with at least one N,N-dialkylamide of a fatty acid having...
5282263 Method of stumulating oil wells by pumped solvent heated in situ to reduce wax obstructions  
A method of stimulating production from an oil well by removing solid wax deposits from a production zone an electrical resistance heater comprised of a packed bed of spherical heating elements...
5247994 Method of stimulating oil wells  
This invention describes a method of stimulating production from an oil well by removing solid wax deposits from a production zone. An electrical resistance heater comprised of a packed bed of...
5228509 Device for protecting wells from corrosion or deposits caused by the nature of the fluid produced or located therein  
Device for protecting wells from the risks of corrosion and deposits due to the nature of the fluid produced or present in the well. It is formed of a steel support casing (2), associated with a...
5200096 Method of inhibiting corrosion in acidizing wells  
Corrosion inhibitor additives are added directly to an aqueous acid solution used in acidizing subterranean formations. The additives comprise a bismuth compound, a quaternary compound, and a...
5183581 Process for the dewaxing of producing formations  
A process, based on the Nitrogen Generating System/Emulsion in the presence of organic solvents, which is useful for the dewaxing of producing formations, is disclosed. The heat generation with the...
5168929 Method and apparatus for removal of oil well paraffin  
An oil well tool and method for its use for removing accumulated deposits along an oil well tubing in a downhole pump operated oil well is disclosed. The tool when in use is untethered and adapted...
5104556 Oil well treatment composition  
Solvent compositions for dissolution of both asphaltene and paraffin petroleum based deposits are described. Solvent compositions comprising kerosene and alkyl phenols, preferably cresol, have been...
5097903 Method for recovering intractable petroleum from subterranean formations  
Many petroleum discoveries which have heretofore been regarded as intractable owing to the immobility of the petroleum can be economically recovered by a process involving local visbreaking of the...
5076358 Petroleum recovery with organonitrogen thiocarbonates  
The effectiveness of secondary and tertiary methods for recovering petroleum from a petroleum-bearing formations is enhanced by introducing into said formation a safe form of carbon disulfide...
5073276 Polymer article of manufacture  
A solid polymeric body comprising a polymer matrix containing a substantially water-insoluble reagent leachable into a substantially hydrocarbon liquid environment, the matrix being reagent...
5063997 Method of preventing precipitation of iron compounds during acid treatment of wells  
The invention discloses a process for reducing sludging during acid treatment of an oil well by adding phosphinic acid or a soluble salt thereof and a source of cupric or cuprous ion. The addition...
5058678 Method for preventing the formation of sludge in crude oil  
An aqueous acidic composition useful for conducting a formation acidizing method is disclosed. The composition, which is comprised of a blend of acetic acid, formic acid, a fatty alkyl quaternary...
5056599 Method for treatment of wells  
The invention relates to a valve suitable for use in high-pressure environment for transmitting a treatment fluid from exterior of which is affected by a pre-charged compression gas which keeps the...
5053149 Method for dewaxing oil and gas pipelines or wells  
A process for dissolving wax, paraffin and/or sulfur deposits in an oil or gas pipeline or well comprises providing at the site of the deposit an acid and a compound which liberates carbon...
5052491 Oil tool and method for controlling paraffin deposits in oil flow lines and downhole strings  
An oil tool and method for controlling the accumulation of paraffin and deposits in downhole oil string and oil transmission flow lines is provided by employing at various locations in the downhole...
5027897 Method of treatment of drilled-in underground formation saturated with hydrocarbon gas  
The method consists in that the formation pressure is measured, and a solvent is fed through a well into the formation. Then a hydrophilizing solution is fed through the same well into the same...
5016712 Method and apparatus for locating solvent injection apparatus within a natural gas wellbore  
A method and apparatus are provided for locating a solvent injection apparatus within a natural gas wellbore to reduce the deposition of hydrocarbonaceous solids which are at least partially...
4997580 Use of organic fluorochemical compounds with oleophobic and hydrophobic groups in crude oils as antideposition agents, and compositions thereof  
A method of inhibiting the deposition of paraffin wax, asphaltene, or mixtures thereof in a crude oil contaminated with paraffin wax, asphaltene, or mixtures thereof and susceptible to such...
4995462 Dewaxing control apparatus for oil well  
Dewaxing control apparatus is adapted for use in a well casing containing a production tubing string defining an annulus within the well casing and a down hole pump which pumps oil upwardly through...
4988389 Exploitation method for reservoirs containing hydrogen sulphide  
A method of producing fluids from subterreanean reservoirs containing hydrogen sulphide and especially those reservoirs where elemental sulphur or hydrogen polysulphides are present. The method...
4958683 Method and apparatus for treating wells  
A method for reducing organic contaminants in a well initially breaks down complex organic compounds by radiation with gamma radiation. The remaining materials are subjected to oxygen radicals in...
4944349 Combination downhole tubing circulating valve and fluid unloader and method  
A combination circulating valve and fluid unloader adapted for connecting in a tubing string disposed within the well bore of a producing well which is closed to downward flow of fluids...
4934457 Composition and method for stimulating wells  
A composition and method for stimulating the production of hydrocarbons from wells partially plugged by paraffins or mineral scale, the composition comprising hydrochloric acid, naphtha and an...
4933089 Apparatus and process for paraffin abatement  
An apparatus and process for preventing the accumulation of paraffin deposits is disclosed. The invention is practiced by conveying the production fluids into contact with a metal which has a...
4911239 Method and apparatus for removal of oil well paraffin  
A method and apparatus for reducing the accumulation of paraffin within an oil well that includes forming an electric circuit contact between the oil well sucker rod and tubing and connecting a...
4911240 Self treating paraffin removing apparatus and method  
A self treating paraffin removing mechanism utilizing existing above ground equipment. The above ground equipment utilized is a heater treater normally employed at the typical well for separating...
4836286 Method for removal of flow-restricting matter from hydrocarbon producing wells  
A method for removing flow-restricting matter such as paraffin, asphalts, clays, scales, or gyps from production equipment and producing formation of and in the vicinity of an oil or gas well. The...
4830112 Method and apparatus for treating wellbores  
A method and apparatus of chemically inhibiting corrosion of a borehole and connected flowlines. A mixing tank receives flow from the chemical pump. The mixing device is connected to the borehole....
4821801 Producing asphaltic crude oil  
An asphaltic crude oil is produced via a well system comprising a horizontal drainhole section extending through the reservoir formation. Formation plugging due to in-situ precipitation of asphalt...
4813482 Method for removal of paraffin from producing oil wells  
A method for removing paraffin from a producing oil well comprising (a) contacting a mixture of a paraffin-dispersing effective amount of an alkyl or aralkyl polyoxyalkylene phosphate ester...
4809778 Oil well tool for in situ release of wellbore treatment fluid  
An oil well tool for in situ release of treatment fluid into an oil well is disclosed. A tubular body is insertable into an oil well casing, which tubular body carries a bladder containing...
4790375 Mineral well heating systems  
Heating systems for mineral wells (e.g. oil wells) employ electrical power sources, sometimes operating at relatively high frequencies, that are connected to the well casing and production tubing...
4775489 Self-breaking foamed oil in water emulsion for stimulation of wells blocked by paraffinic deposits  
A self-breaking, foamed, oil-in-water emulsion contains a water-immiscible organic solvent for paraffins and asphaltenes, an aqueous nonformation-damaging component, an inert gas, and surface...
4722398 Retarding deposition of paraffin from crude oil or natural gas with alkaline liquids  
An improved method for inhibiting the deposition of paraffins on the surface of equipment in contact with crude oil or natural gas streams containing paraffins. The deposition of paraffins may be...
4696752 System for acidizing oil and gas wells  
A composition comprising methanol and ethanol, a propanol, or tertiary-butanol, or any combination thereof and a mixture of C 6 -alcohols through C 10 -alcohols is suitable for use in acidizing...
4693312 Method of utilizing paraffin inhibitors  
An improved method for depositing a pour point depressant in an oil producing formation so that the pour point depressant can slowly dissolve in the oil as the oil is produced which comprises the...
4681167 Apparatus and method for automatically and periodically introducing a fluid into a producing oil well  
The present invention discloses an apparatus and method for periodically and automatically introducing fluid into a producing well through a tubing drain valve in the production tubing. The...
4681164 Method of treating wells with aqueous foam  
A method of treating wells with the use of a foam as a circulating fluid provides for the steps of generating a stable foam, circulating the foam up the well to remove loose solids and fluids from...
4674959 Pressure-operated valve, particularly for a downhole pump  
A pressure-operated valve is provided, particularly for use with a downhole pump of the fluid-driven, successive-stage, bladder type. Such a pump includes a plurality of pump and transfer modules....
4669544 Reducing paraffin deposits on paraffin contaminated surfaces  
A method of reducing paraffin deposits on a paraffin contaminated surface. The surface is contacted with a sulphur trioxide containing liquid to react with the paraffin, and convert at least a...
4668408 Composition and method for treatment of wellbores and well formations containing paraffin  
Composition and method for treating wellbores and well formations to remove and inhibit accumulations of paraffin. The composition comprises a liquid mixture of a water soluble ethoxylated alkyl...
4660645 Method for controlled introduction of reagent into a liquid  
A method is provided for the controlled introduction of a reagent into a liquid, preferably a reagent peremeable substantially hydrocarbon liquid, which method comprises the steps of: (a)...
4655285 Plug for use in hot oil treatment of wells having paraffin deposits and method of use thereof  
A plug for use in reducing paraffin deposits inside a production tubing string within a casing is slidably received on one of the production string tubing joints and supported on a tubing string...
4648453 Process for remedial cementing  
An improved method is disclosed for remedial cementing operations. Prior to conducting the remedial cementing operation, the zone to be cemented is pretreated with a hydrocarbon solvent capable of...
4646837 Process for removal of wax deposits  
Solid wax-containing material deposited on pipeline walls, well tubing, etc., are removed by contacting the deposited wax with a mixture of a dispersant-type surfactant and light hydrocarbon at...
4595511 Process for stimulating petroleum production wells  
Process for stimulating petroleum production wells by injecting, into the production well, a solution of higher aromatics (high-flash aromatics) which contains a mixture comprising 50-90% of an...
4592424 Secondary recovery procedure  
A method applicable to secondary recovery procedure employing an injection well. It applies to conditions caused by return flow of injection fluid back into the well from the formation being...
4538682 Method and apparatus for removing oil well paraffin  
A method of removing paraffin build up from an oil well which includes determining the location of a cooler portion of the oil well at which paraffin build up occurs, introducing an inductance...
Matches 101 - 150 out of 251 < 1 2 3 4 5 6 >