| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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| 03/04/1998 | EP0696335B1 Acidising underground reservoirs |
| 03/03/1998 | US5723423 Solvent soaps and methods employing same |
| 02/25/1998 | EP0824631A1 Method for inhibiting the plugging of conduits by gas hydrates |
| 02/19/1998 | WO1998006927A1 Traction apparatus |
| 02/18/1998 | CN2274689Y Wax monitor for sucking oil well |
| 02/17/1998 | US5718289 Apparatus and method for use in injecting fluids in a well |
| 01/29/1998 | WO1998003309A2 Power tool |
| 01/29/1998 | WO1997041330A3 Multi-lateral wellbore system and method for forming same |
| 01/28/1998 | CN1037204C Well wall cleaning tool with scrap element |
| 01/27/1998 | US5711046 For cleaning an interior bore of a tubular member |
| 01/21/1998 | EP0819207A1 Method for improved water well production |
| 01/21/1998 | EP0735919B1 Solvent soaps and methods employing same |
| 01/08/1998 | DE19708140A1 Well regeneration appliance |
| 01/08/1998 | DE19626590A1 Water jet cleaning system for use in deep well bores |
| 01/07/1998 | EP0815349A1 Hydrocarbon production using multilateral well bores |
| 01/07/1998 | CA2209960A1 Well regeneration apparatus and method of regenerating wells |
| 12/29/1997 | EP0772696A4 Method for removing alkaline sulfate scale |
| 12/29/1997 | EP0728254A4 A method of scale dissolution in a formation containing multiple productive intervals |
| 12/23/1997 | US5700376 Method and apparatus for magnetically treating flowing liquids |
| 12/18/1997 | WO1997047854A1 Device for giving out doses of a fluid |
| 12/18/1997 | WO1997047853A1 Method and device for rinsing and/or cleaning delivery piping |
| 12/17/1997 | EP0812307A1 Method for inhibiting hydrate formation |
| 12/16/1997 | US5697459 Directional self-propelled drill |
| 12/10/1997 | EP0811110A1 Oil well treatment |
| 11/25/1997 | US5690176 Composition effective in removing asphaltenes |
| 11/20/1997 | WO1997043517A1 Washpipe stabilisation |
| 11/20/1997 | CA2253753A1 Washpipe stabilisation |
| 11/06/1997 | WO1997041330A2 Multi-lateral wellbore system and method for forming same |
| 11/06/1997 | DE19616979A1 Safety device for forced removal of material from underground pipes |
| 11/04/1997 | US5682950 Means for collecting unwanted material in an oil or gas well |
| 10/22/1997 | CN1162688A Multifunctional sealed oil storing device of oil well |
| 10/21/1997 | US5678632 Injecting an enzyme substrate which is capable of being converted into an organic acid along with the enzyme |
| 10/14/1997 | US5676763 Process for cleaning pipe dope and other solids from well systems |
| 10/14/1997 | US5676213 Method for treating an earth formation |
| 09/23/1997 | US5669445 Well gravel pack formation method |
| 09/10/1997 | EP0794317A2 Apparatus and method for injecting fluids in a well |
| 09/09/1997 | US5665221 Electrical apparatus for controlling liquid contaminants |
| 08/20/1997 | CN1157651A Method for inhibiting hydrate formation |
| 08/13/1997 | CN2259484Y Multifunctional ball injector |
| 08/13/1997 | CN1035635C Oil well paraffin cleaning agent for oil production |
| 07/15/1997 | CA2083599C Device for removing paraffin and other deposits from the internal surface of pipes |
| 07/09/1997 | EP0721534A4 Control of iron deposition in borehole pumps |
| 06/24/1997 | US5641018 Apparatus and method for cementing wells |
| 06/17/1997 | US5639313 Countercurrent laminar flow of water in oil emulsion containing acetic acid-activated mixture of sodium nitrite and ammonium chloride pumped into conduit to fluidize wax deposits by generated nitrogen and heat |
| 06/11/1997 | EP0778393A2 Method and apparatus for maintaining the performance of new water wells and for cleaning and regeneration of excisting water wells by means of ultrasound |
| 06/11/1997 | EP0777837A1 A method for inhibiting hydrate formation |
| 06/03/1997 | US5634984 Contacting with solution containing two surfactants with different hydrophilic-lipophilic balance values and nonpolar diluent oil, rinsing with water |
| 05/14/1997 | EP0772696A1 Method for removing alkaline sulfate scale |
| 05/14/1997 | CN2254120Y Secondary well cleaning device for combined rod type oil pumping unit |
| 04/23/1997 | EP0712461A4 Rotary piston driving mechanism |
| 04/23/1997 | CN2252884Y Automatic paraffin scraper of oil well |
| 04/10/1997 | WO1997012947A1 Cleaning compositions for oil and gas wells, lines, casings, formations and equipment and methods of use |
| 04/08/1997 | US5619611 Device for removing downhole deposits utilizing tubular housing and passing electric current through fluid heating medium contained therein |
| 04/02/1997 | CN2251040Y Hole cleaning drilling pail for pile hole drilling machine |
| 03/26/1997 | EP0764061A1 Method for removing alkaline earth metal scale |
| 03/11/1997 | CA2022144C Geothermal well chemical injection system |
| 02/27/1997 | WO1997007316A1 Scraper for removing an earth core from a pipe laid without excavation |
| 02/26/1997 | EP0639240B1 Microencapsulated oil field chemicals and process for their use |
| 02/19/1997 | CN1143104A Effective composite for removing asphalt |
| 02/18/1997 | US5603378 Well cleaning tool |
| 02/12/1997 | CN1142786A Solvent soaps and methods employing same |
| 01/22/1997 | EP0754837A2 Device for irradiation of wells to prevent biological stains |
| 01/22/1997 | EP0754836A1 Method and apparatus for removing gelled drilling fluid and filter cake from the side of a well bore |
| 01/22/1997 | CN2245661Y Electric submersible well cleaning machine |
| 01/21/1997 | US5595243 Acoustic well cleaner |
| 01/14/1997 | US5592866 For converting longitudinal reciprocating motion to longitudinal motion |
| 12/27/1996 | WO1996041834A1 Polymers for use as hydrate inhibitors |
| 12/27/1996 | WO1996041784A1 Method for inhibiting hydrate formation |
| 12/11/1996 | CN2242333Y Apparatus for fishing sediment from bottom of well |
| 12/10/1996 | US5583273 Method for inhibiting hydrate formation |
| 12/09/1996 | CA2178371A1 Method for inhibiting hydrate formation |
| 12/04/1996 | EP0745175A1 Process for removing the core of earth from a pipe laid without excavation and scraper for implementing said process |
| 12/04/1996 | CN2241772Y Non-contact pneumatic sludge scraper |
| 12/03/1996 | US5579845 Method for improved water well production |
| 11/20/1996 | EP0727009A4 Well cleanout system and method |
| 11/14/1996 | DE19526792C1 Radioactive source in water well filter |
| 11/05/1996 | US5570742 Tubular cleaning tool |
| 10/31/1996 | WO1996034177A1 Method for inhibiting the plugging of conduits by gas hydrates |
| 10/16/1996 | EP0737798A2 Composition effective in removing asphaltenes |
| 10/15/1996 | US5564500 Apparatus and method for removing gelled drilling fluid and filter cake from the side of a well bore |
| 10/09/1996 | EP0735919A1 Solvent soaps and methods employing same |
| 10/03/1996 | WO1996030625A1 Hydrocarbon production using multilateral well bores |
| 09/25/1996 | EP0733779A2 Method and apparatus for cleaning wells by means of ultrasound |
| 09/25/1996 | CN2236016Y Uphole wax-scraping device of sucker rod |
| 09/06/1996 | WO1996027070A1 Oil well treatment |
| 09/06/1996 | CA2213698A1 Oil well treatment |
| 08/28/1996 | EP0728254A1 A method of scale dissolution in a formation containing multiple productive intervals |
| 08/21/1996 | EP0727009A1 Well cleanout system and method |
| 08/15/1996 | WO1996024746A1 Method for improved water well production |
| 08/08/1996 | WO1996023956A1 Method for controlling iron bacteria and improving the hydrodynamics of water wells, and devices therefor |
| 08/07/1996 | EP0724545A1 Apparatus for magnetically treating flowing liquids |
| 08/06/1996 | US5543388 Acetylenic alcohols, quaternary ammonium compounds, cinnamaldehyde, iodine in nonaqueous solvent |
| 07/31/1996 | CN2232073Y Rotating theft-proof ball valve |
| 07/18/1996 | DE19500149A1 Repairing horizontally laid drain pipes |
| 07/17/1996 | EP0721534A1 Control of iron deposition in borehole pumps |
| 07/17/1996 | CN2231308Y Automatic reversing wax removing device for oil well |
| 07/09/1996 | US5533571 Fluid jetting apparatus for use in a well |
| 06/26/1996 | CN1125472A Acidising underground reservoirs |
| 06/26/1996 | CN1125290A Pressure pulse oscilation deblocking method |
| 06/18/1996 | US5526877 Oil well head cleaning system |