| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 06/13/1996 | DE19543473A1 Vorrichtung und Verfahren zum Entfernen von Ablagerungen bei der Erdöl- und Erdgasförderung Apparatus and method for removing deposits in the oil and gas production |
| 05/22/1996 | EP0712461A1 Rotary piston driving mechanism |
| 05/19/1996 | CA2162964A1 Method for enhanced cleanup of horizontal wells |
| 05/14/1996 | US5517593 Control system for well stimulation apparatus with response time temperature rise used in determining heater control temperature setpoint |
| 05/08/1996 | CN1121981A Well wall cleaning tool with scrap element |
| 05/02/1996 | DE4438067A1 Removal of impurities from ground water and the earth through which it flows |
| 04/25/1996 | DE19537689A1 Method and equipment used for cleaning spring wells |
| 04/23/1996 | US5510038 Adding liquid conditioning agent at high point of seepage pipe |
| 04/10/1996 | CN2224275Y Wax remover for oil-pumping rod |
| 04/09/1996 | US5505262 Fluid flow acceleration and pulsation generation apparatus |
| 03/21/1996 | WO1996008673A1 A method for inhibiting hydrate formation |
| 03/14/1996 | WO1996007763A1 Method for removing alkaline sulfate scale |
| 03/13/1996 | CN1118617A Application of N,N-dialkylamides to reduce precipitation of asphalt from crude oil |
| 03/06/1996 | EP0699269A1 Method for placement of a scale inhibitor in a formation |
| 02/28/1996 | CN2221099Y Powerless automatic wax removing device for oil well |
| 02/27/1996 | US5494109 Backflush filter system for downhole pumps |
| 02/14/1996 | EP0696335A1 Acidising underground reservoirs |
| 01/24/1996 | CN2218248Y Sleeve aligning vortex caster |
| 01/23/1996 | US5485883 Method and apparatus to enhance the recovery of crude oil |
| 01/16/1996 | US5484016 For use in removing material buildup from an inner surface |
| 01/10/1996 | CN2217099Y Device for cleaning wax of oil-pumping well |
| 12/14/1995 | WO1995033581A1 Method for removing alkaline earth metal scale |
| 12/12/1995 | US5474130 Perforation purging tool |
| 12/06/1995 | EP0569484B1 Well cleanout using caustic alkyl polyglycoside compositions |
| 11/22/1995 | CN2213229Y Sand-proof flushing valve |
| 11/22/1995 | CN2213228Y Through plug stick well-flushing valve |
| 11/21/1995 | US5467684 Rotary piston driving mechanism |
| 11/15/1995 | EP0681640A1 Application of n,n-dialkylamides to reduce precipitation of asphalt from crude oil |
| 11/08/1995 | CN2212072Y Elastic sleeve wax scraping device |
| 11/01/1995 | CN1111064A Method and apparatus for oil or gas well cleaning |
| 10/31/1995 | US5462668 Use of steam to condensate to dilute brine stream additives |
| 10/31/1995 | US5462118 Method for enhanced cleanup of horizontal wells |
| 10/31/1995 | US5462115 For mounting within a well casing |
| 10/17/1995 | US5458860 Dissolving |
| 10/17/1995 | US5458198 Method and apparatus for oil or gas well cleaning |
| 10/17/1995 | US5458197 Plural serially-injected fluid compositions for removing contaminants |
| 10/10/1995 | CA2052202C Method and apparatus for oil well stimulation |
| 10/03/1995 | US5454943 Device for the magnetic treatment of fluids |
| 09/26/1995 | US5452760 Well pump tubing scrapers |
| 09/26/1995 | CA2020229C Well treatment method |
| 09/20/1995 | CN2208097Y High performance wax remover |
| 09/19/1995 | CA1337018C Process for the transport of an hydrate-forming fluid |
| 09/13/1995 | CN2207440Y Screw arbor pump thermal-washing well side wall valve |
| 09/06/1995 | CN2206836Y Self-propelled flexibility wax cleaner for oil pipe |
| 09/05/1995 | US5447200 Method and apparatus for downhole sand clean-out operations in the petroleum industry |
| 08/31/1995 | DE4294552C2 Clearing of plug to restore well flow |
| 08/17/1995 | WO1995021984A1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 08/17/1995 | DE4404712A1 Verfahren zum Ausbau eines Erdkerns aus einem grabenlos verlegten Rohr und Molch zur Durchführung des Verfahrens A method for removing a soil core from a trenchless laid pipe and pigging for performing the method |
| 08/08/1995 | US5439058 Method of cleaning an oil or gas well |
| 08/01/1995 | US5438039 Using a mixture of polyaromatics, saturated hydrocarbons, and alkylbenzenes to dissolve; enhanced oil recovery |
| 06/29/1995 | WO1995017244A1 Solvent soaps and methods employing same |
| 06/29/1995 | CA2179720A1 Solvent soaps and methods employing same |
| 06/20/1995 | US5426258 Process for reducing the agglomeration tendency of hydrates in the production effluent |
| 06/15/1995 | WO1995016104A1 A method of scale dissolution in a formation containing multiple productive intervals |
| 06/15/1995 | CA2174770A1 A method of scale dissolution in a formation containing multiple productive intervals |
| 06/07/1995 | EP0656459A1 Method for treating oil wells |
| 05/31/1995 | CN2199305Y Screw stem pump device for hot-flushing well |
| 05/31/1995 | CN1103102A Effective hydrocarbon blend for removing asphaltenes |
| 05/30/1995 | US5419397 Well cleaning tool with scratching elements |
| 05/16/1995 | US5415696 Milling the scale with a head, injection of solvent with chelate compound |
| 05/11/1995 | WO1995012741A1 Well cleanout system and method |
| 05/09/1995 | US5413721 Backflush filter system for downhole pumps |
| 05/09/1995 | US5413718 Use of added water to achieve 100% injection weight in geothermal operations |
| 05/09/1995 | US5413180 One trip backwash/sand control system with extendable washpipe isolation |
| 05/04/1995 | DE4337340A1 Reaming bit for drainage filter wells |
| 04/27/1995 | WO1995011198A1 Apparatus for magnetically treating flowing liquids |
| 04/27/1995 | DE4405298C1 Groundwater purification in the in-situ process with backwash |
| 04/27/1995 | DE4332690A1 Process for regenerating and/or looking after wells, and apparatus for carrying out the process |
| 04/27/1995 | CA2174724A1 Apparatus for magnetically treating flowing liquids |
| 04/25/1995 | US5409614 Control of scale deposition in geothermal operations |
| 04/06/1995 | WO1995009293A1 Use of steam condensate to dilute brine stream additives |
| 04/06/1995 | WO1995009292A1 Use of added water to achieve 100 % injection weight in geothermal operations |
| 04/06/1995 | WO1995009283A1 Control of iron deposition in borehole pumps |
| 03/22/1995 | EP0644315A1 Effective hydrocarbon blend for removing asphaltenes |
| 03/21/1995 | US5400430 Method for injection well stimulation |
| 02/28/1995 | US5392814 Water well rehabilitation apparatus |
| 02/22/1995 | EP0639240A1 Microencapsulated oil field chemicals and process for their use. |
| 02/22/1995 | EP0608238A4 Electro-vac decontamination process. |
| 02/15/1995 | EP0638663A2 Intensified corrosion inhibitor and method of use |
| 02/15/1995 | EP0638049A1 Installation for preventing deposits in a structure's drainage system |
| 02/14/1995 | US5388646 Method for rejuvenation of injection wells |
| 02/14/1995 | US5388644 Flooding in oil-bearing formation through an injection well a miscible fooding solvent from liquid natural gas and liquid carbon dioxide containing amide; enhanced oil recovery |
| 02/09/1995 | WO1995004207A1 Rotary piston driving mechanism |
| 02/09/1995 | WO1995003870A1 Backflush filter system for downhole pumps |
| 02/09/1995 | CA2168758A1 Rotary piston driving mechanism |
| 02/08/1995 | CN1027601C Heated scrubing valve |
| 02/07/1995 | CA2017640C Well completions |
| 02/02/1995 | WO1995003140A1 Method for removing alkaline earth scale from the interior surface of production tubing |
| 01/26/1995 | WO1995002745A1 Control of scale deposition in geothermal operations |
| 01/17/1995 | US5382728 Effective hydrocarbon blend for removing asphaltenes |
| 01/12/1995 | DE4322420A1 Combination in-situ process for ground water purification |
| 01/03/1995 | US5377758 Method for effective placement of a long life scale inhibitor |
| 12/27/1994 | US5375662 For applying hydraulic pressure to an operated well |
| 12/22/1994 | WO1994029570A1 Method and apparatus for oil or gas well cleaning |
| 12/22/1994 | WO1994029569A1 Well cleaning tool with scratching elements |
| 12/22/1994 | CA2142304A1 Method and apparatus for oil or gas well cleaning |
| 12/20/1994 | US5374361 Well cleanout using caustic alkyl polyglycoside compositions |
| 12/13/1994 | US5372197 Tubing unloader apparatus and method |
| 12/13/1994 | US5372191 Device for removing paraffin and other deposits from the internal surface of pipes |
| 12/09/1994 | CA2098000A1 Perforation cleaning tools |