| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 09/11/2002 | CN2510621Y Oil-well self-heat-source supercojnducting paraffin-preventing and viscosity-reducing apparatus |
| 09/06/2002 | WO2002035061A3 Method and pumping out means for improving the supply of water to a source or a water procurement well |
| 09/06/2002 | WO2002010546A3 Method and apparatus for formation damage removal |
| 09/04/2002 | CN2509319Y Automatic scraper specially adapted for pumping well |
| 09/03/2002 | CA2074022C Sand control with resin and explosive |
| 08/29/2002 | WO2002066785A1 Composition and method for inhibition of formation of gas hydrates |
| 08/29/2002 | WO2000014378A9 Gas impulse device and method of use thereof |
| 08/29/2002 | US20020116820 Method of diminishing the cross section of an opening of a hollow device located in a flow pipe |
| 08/28/2002 | EP1234095A1 Method of improving the permeability of an earth formation |
| 08/28/2002 | EP0721534B1 Control of iron deposition in borehole pumps |
| 08/20/2002 | US6434825 Method of diminishing the cross section of an opening of a hollow device located in a flow pipe |
| 08/15/2002 | WO2002063203A2 Method of diminishing the size of the cross section of an opening of a hollow device located in a flow pipe |
| 08/15/2002 | US20020109080 Wellbores utilizing fiber optic-based sensors and operating devices |
| 08/15/2002 | US20020108751 Traction apparatus |
| 08/14/2002 | CN1363757A Automatic wax remover for pumped oil well |
| 08/08/2002 | US20020104649 Casing scraper |
| 08/06/2002 | US6427776 Sand removal and device retrieval tool |
| 08/01/2002 | WO2002016009A3 Non-cryogenic production of nitrogen for on-site injection in well clean out |
| 07/31/2002 | EP1226335A1 Asphaltenes monitoring and control system |
| 07/31/2002 | EP0898638B1 Washpipe stabilisation |
| 07/31/2002 | CN2503195Y Centering sucker rod |
| 07/18/2002 | WO2002055831A2 Improved method for stimulation of liquid flow in a well |
| 07/18/2002 | WO2002055225A1 Method and device for washing pipes |
| 07/17/2002 | CN1358926A Self-adaptive pressure hot washing valve |
| 07/16/2002 | US6419019 Method to remove particulate matter from a wellbore using translocating fibers and/or platelets |
| 07/11/2002 | WO2002053872A1 The automatic paraffin scraping device used for oil well |
| 07/11/2002 | US20020088617 Automatic paraffin removal unit |
| 07/03/2002 | EP0956427B1 On-line, thermo-chemical process for the dewaxing of oil export pipelines |
| 07/03/2002 | CN2498325Y Press injecting wax remover on sucker rod |
| 07/02/2002 | CA2212411C Method for improved water well production |
| 06/27/2002 | US20020079107 Subsurface apparatus |
| 06/26/2002 | CN1355371A Method for cleaning wall without backflow |
| 06/25/2002 | US6408945 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 06/19/2002 | CN2495803Y Sealing type well flushing able packer |
| 06/12/2002 | EP1102916A4 Apparatus and method for perforating and stimulating a subterranean formation |
| 06/11/2002 | US6401813 Wellhead cleanup tool |
| 06/11/2002 | CA2251639C Apparatus and method for perforating and stimulating a subterranean formation |
| 06/11/2002 | CA2036165C Method and well system for producing hydrocarbons |
| 06/06/2002 | WO2002044518A1 Tool, method and system for flushing a vertical riser |
| 06/06/2002 | US20020066566 Method and apparatus for reducing fouling of injection and recovery wells |
| 06/06/2002 | US20020066309 Monitoring of downhole parameters and tools utilizing fiber optics |
| 06/05/2002 | EP1210500A1 Borehole cleaning apparatus and method |
| 06/04/2002 | US6397864 Nozzle arrangement for well cleaning apparatus |
| 05/30/2002 | WO2002042601A1 Bi-directional traction apparatus |
| 05/30/2002 | US20020062860 Method for storing and transporting crude oil |
| 05/29/2002 | EP1208285A1 Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 05/29/2002 | CN2493741Y High-efficient cable dirty scraper |
| 05/29/2002 | CN2493740Y Self-overflow cleaning device for oil well |
| 05/22/2002 | CN2492679Y Self-locked wax scraper |
| 05/17/2002 | CA2326276A1 Well bore cleaning tool |
| 05/16/2002 | US20020057151 Apparatus for retrieving metal debris from a well bore |
| 05/15/2002 | CN2491600Y Anti-dropping wax cleaner for sucker rod |
| 05/15/2002 | CN1349587A Method and apparatus for reducing fouling of injection and recovery wells |
| 05/02/2002 | WO2002035061A2 Method and pumping out means for improving the supply of water to a source or a water procurement well |
| 05/02/2002 | WO2002035055A1 Combined milling and scraping tool |
| 05/02/2002 | WO2002035017A1 Well cleaning apparatus and method |
| 05/02/2002 | US20020050355 Method of early predicting paraffin deposition risks during production and transport |
| 05/02/2002 | EP0960263B1 Tool and method for removing excess cement from the top of a liner after hanging and cementing thereof |
| 05/01/2002 | CN2489091Y Oil pipe cleaning device |
| 04/30/2002 | US6378611 Procedure and device for treating well perforations |
| 04/17/2002 | CN2486734Y Double sand holding bucket downhole bailing tub |
| 04/16/2002 | US6371207 Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 04/09/2002 | US6369004 Oil and gas drilling and transportation; antiscaling crystal growth inhibitors added at low concentrations; maleic anhydride polymers reacted with amines where cyclic imide products do not form |
| 04/02/2002 | US6364013 Shroud for use with electric submergible pumping system |
| 03/28/2002 | WO2002025060A1 Shunting of a well stream |
| 03/28/2002 | US20020038063 Composition and method for inhibition of formation of gas hydrates |
| 03/28/2002 | US20020037529 Use of 13C nuclear magnetic resonance to detect binding to target molecules |
| 03/28/2002 | US20020036085 Toroidal choke inductor for wireless communication and control |
| 03/27/2002 | CA2321316A1 Technique for treating hydrocarbon wells |
| 03/21/2002 | WO2001073262A3 Sand removal and device retrieval tool |
| 03/20/2002 | EP1073824B1 An apparatus, a system and a method for washing a tubular in a wellbore |
| 03/20/2002 | CN1081215C Oil well wax clearing agent for oil field |
| 03/19/2002 | US6357539 Apparatus for retrieving metal objects from a wellbore |
| 03/13/2002 | CN2481847Y Cylindrical body outer wall dirt scraping and cleaning device |
| 03/13/2002 | CN2481846Y Automatic paraffin removal and heat cleaning device for oil production by screw pump |
| 03/13/2002 | CN2481844Y Integrative temp. -controlled short circuit heat-washing paraffin removal unit |
| 03/13/2002 | CN1080755C Dissolving method for asphalt resultant in oil well |
| 03/12/2002 | US6354386 Apparatus for retrieving metal objects from a wellbore |
| 03/07/2002 | US20020027004 Computer controlled injection wells |
| 03/06/2002 | CN2480538Y Short connection type wax-scrapping stabilizer |
| 03/06/2002 | CN1080365C Apparatus and method for perforating and stimulating subterranean formation |
| 03/06/2002 | CN1080363C On-line thermo-chemical process for dewaxing of oil export pipelines |
| 03/05/2002 | US6352113 Method and apparatus to remove coiled tubing deployed equipment in high sand applications |
| 02/28/2002 | WO2002016009A2 Non-cryogenic production of nitrogen for on-site injection in well clean out |
| 02/28/2002 | US20020023748 Method and apparatus for washing subsea drilling rig equipment and retrieving wear bushings |
| 02/27/2002 | EP1062297B1 A method of improving the flow properties of a crude oil or natural gas liquid |
| 02/27/2002 | CN2479202Y Super-long stroke downhole bailer |
| 02/27/2002 | CN2479201Y Oil-well solid paraffin control pipe string |
| 02/27/2002 | CN2479187Y Sucker rod nylon paraffin cutting centralizer |
| 02/21/2002 | WO2001066907A8 Clean out tool |
| 02/21/2002 | US20020020535 Reservoir communication with a wellbore |
| 02/21/2002 | US20020020532 Well starter device |
| 02/20/2002 | EP1180194A1 Subsurface apparatus |
| 02/20/2002 | CN2477821Y Oil wiper of sucker rod |
| 02/19/2002 | US6347675 Coiled tubing drilling with supercritical carbon dioxide |
| 02/19/2002 | US6347667 Well clean-up tool with improved cleaning member |
| 02/13/2002 | CN1335449A Method of fixing the retaining ring of centering guide and wax scraper to pumping rod |
| 02/07/2002 | WO2002010546A2 Method and apparatus for formation damage removal |
| 02/07/2002 | WO2001077491A3 Electropolishing method for oil field tubular goods and drill pipe |
| 02/06/2002 | EP1178099A2 Well drilling and servicing fluids |