| Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
|---|
| 07/08/1993 | WO1993013292A1 Method and device for reestablishment of circulation in an operating well |
| 07/07/1993 | CN2137712Y Drip |
| 07/07/1993 | CN2137711Y Special device for removing wax in oil well pipe |
| 07/06/1993 | US5224543 Use of scale inhibitors in hydraulic fracture fluids to prevent scale build-up |
| 07/01/1993 | DE4143056A1 Verwendung ausgewaehlter inhibitoren gegen die ausbildung fester inkrustationen auf organischer basis aus fliessfaehigen kohlenwasserstoffgemischen Use of selected inhibitors against the education of solid incrustations on an organic basis of fliessfaehigen hydrocarbon mixtures |
| 06/09/1993 | CN2135645Y Working state changing controllable electric wax cleaning winch |
| 06/09/1993 | CN1021115C Polyalky leneoxyamine catalysts for dialkyl disulfides and/or polysulfides used in dissolving sulfur |
| 06/08/1993 | CA1318848C Dewaxing apparatus for oil well |
| 06/02/1993 | CN1021072C Downhole jetting tool |
| 05/26/1993 | CN2134483Y Wax wiper for oil well |
| 05/11/1993 | US5209301 Multiple phase chemical injection system |
| 05/11/1993 | US5209300 Pressure regulated chemical injection system |
| 05/11/1993 | US5209299 Multiple chamber chemical injection system |
| 05/11/1993 | US5209298 Pressurized chemical injection system |
| 04/28/1993 | CN2130916Y Self-cleaning type vertical tube socket slurry filter |
| 04/22/1993 | DE4133531A1 Deep well water regeneration - has pulsed flow of medium through the filter w.r.t. pH values and filter resistance with independent action on separate sections |
| 04/07/1993 | CN2129336Y Hanging type drop-resistant mud-scraping device |
| 03/23/1993 | US5195585 Wireline retrievable jet cleaning tool |
| 03/18/1993 | WO1993005269A1 Improved slip stream device with adjustable choke, and method of choking a fluid flow path |
| 03/04/1993 | WO1993004263A1 Method for scale removal in a wellbore |
| 03/04/1993 | WO1993004259A1 Method for scale removal in a wellbore |
| 02/02/1993 | US5183112 Contacting with aqueous alkaline solution comprising chelating agent and synergist anion, and sparging the solvent with air to dissolve scale |
| 02/02/1993 | CA1313369C Sulfur dissolving composition |
| 01/21/1993 | WO1993001010A1 Electro-vac decontamination process |
| 01/21/1993 | CA2112990A1 Electro-vac decontamination process |
| 01/20/1993 | EP0523236A1 Device for removing paraffin and other deposits from the internal surface of pipes |
| 01/19/1993 | US5180016 Apparatus and method for placing and for backwashing well filtration devices in uncased well bores |
| 01/06/1993 | CN1067703A Filth-removing apparatus for beam-pumping well |
| 12/30/1992 | CN2126232U Outer-adapter type magnetizer |
| 12/29/1992 | US5174394 Apparatus for cleaning layers of earth |
| 12/23/1992 | EP0519793A2 Device and installation for the cleaning of drain pipes, in particular in oil production wells |
| 12/22/1992 | CA1311681C Sand tool |
| 12/08/1992 | US5168929 Method and apparatus for removal of oil well paraffin |
| 12/01/1992 | US5167279 Well cleaning assembly |
| 11/25/1992 | CN2122931U Grease stain-cleaning and oil removing device for oil wells |
| 11/12/1992 | WO1992019838A1 Pipe cleaner device |
| 11/11/1992 | EP0512331A1 Device for cleaning the well-bore-surrounding-zone |
| 11/10/1992 | US5161612 Well casing wash assembly |
| 11/04/1992 | EP0511296A1 Cleaning device |
| 11/04/1992 | CN2120878U Cold deliver wax cleaner for petroleum oil delivery pipe |
| 10/28/1992 | CN2120178U Fuel-economizing leakproof flush well bottom valve |
| 10/27/1992 | US5158140 Apparatus and method for cleaning out an underground well |
| 10/14/1992 | CN2118813U Piston type well picking awl |
| 10/13/1992 | US5154230 Polymerizing resin to form colsolidate matrix that prevents fl ow of sand |
| 10/07/1992 | CN2118153U Explosion-proof sand washing device for oil or water well |
| 10/07/1992 | CN1065119A Rotary wax wiper |
| 09/30/1992 | CN2117463U Multifunctional small core |
| 09/22/1992 | US5148867 Stop for an oil well swabbing device |
| 09/15/1992 | US5146988 Converting calcium sulfate scale to calcium carbonate with carbon dioxide and water, dissolving the calcium carbonate in the acid solution |
| 09/08/1992 | US5145013 Sand control with resin and explosive |
| 08/26/1992 | CN2114026U Joggled wax scrper |
| 08/18/1992 | US5139088 Method of inhibiting asphalt precipitation in an oil production well |
| 08/05/1992 | CN1063331A Heated scrubing valve |
| 08/04/1992 | US5135051 Perforation cleaning tool |
| 07/31/1992 | WO1992014031A1 Well cleanout using caustic alkyl polyglycoside compositions |
| 07/29/1992 | WO1992013171A1 Device for removing paraffin and other deposits from the internal surface of pipes |
| 07/21/1992 | CA1305406C Method and system to proportion assisting fluids in a well |
| 07/08/1992 | CN2109437U Borehole automatic debris dredging up device |
| 07/07/1992 | US5127472 Indicating ball catcher |
| 07/07/1992 | US5127457 Method and well system for producing hydrocarbons |
| 06/17/1992 | CN2107523U Composite well cleaning car |
| 06/09/1992 | US5120935 Method and apparatus for oil well stimulation utilizing electrically heated solvents |
| 06/09/1992 | US5120203 Universal plunger for oil well pumps |
| 06/09/1992 | CA1302873C Method and system for preventing sulphur deposition in high-h-s productionwells |
| 06/04/1992 | DE4037899A1 Cleaning device for well shaft - includes perforated or slotted well tube with sealed treatment chamber and pressure pump |
| 06/02/1992 | CA1302233C Gaswell dehydrate valve |
| 05/26/1992 | CA1301639C Water well treating apparatus and method |
| 05/26/1992 | CA1301638C Pressure actuated cleaning tool |
| 05/13/1992 | CN2104291U Electric heat wax-proof and cleaning device |
| 04/16/1992 | WO1992006274A1 Method and apparatus for oil well stimulation |
| 04/16/1992 | DE4032118A1 Well cleaning device sealed against well shaft wall - has inflatable cuffs or hoses and controls pressure of supplied medium w.r.t. pressure within enclosed chamber |
| 04/15/1992 | EP0480771A1 Process for running scrapers for subsea lines |
| 04/08/1992 | CN2101104U Hydraulic piston type petroleum tube hot washing valve |
| 04/07/1992 | US5101900 Sand control in wells with gas generator and resin |
| 04/01/1992 | CN2100481U Electric-heaating waxiness anti-solidifying oil extraction lifting rod |
| 04/01/1992 | CN1016068B Sulfur dissolving composition |
| 03/24/1992 | US5097901 Apparatus for removing fluids from a well |
| 03/18/1992 | CN2099189U Multi-purpose scraper for oil well drilling |
| 03/17/1992 | US5095976 Tubing sand pump |
| 03/11/1992 | CN1015802B Internally installed fluid magnetic core |
| 03/04/1992 | CN2097900U Machinery oil well hot washing pump oil-separating layer device |
| 02/25/1992 | US5090481 Fluid flow control apparatus, shifting tool and method for oil and gas wells |
| 02/19/1992 | CN1058825A Wax scraper of pumping unit |
| 02/12/1992 | CN1015482B Method of removal of hydrogen sulfide |
| 02/11/1992 | US5086842 Device and installation for the cleaning of drains, particularly in a petroleum production well |
| 02/05/1992 | EP0469133A1 Device for delivering corrosion or deposition inhibiting agents into a well by means of an auxiliary delivery tube. |
| 01/22/1992 | CN2093897U Multi-functional cable cleaner |
| 01/08/1992 | CN2092599U Place-restricting clips for nylon wax scrapers |
| 01/02/1992 | EP0333859B1 Device for cleaning pipelines |
| 12/31/1991 | US5076365 Down hole oil field clean-out method |
| 12/31/1991 | US5076364 Injecting carrier and alcohol |
| 12/31/1991 | US5076355 Perforating gun with auger |
| 12/03/1991 | US5069725 Pollution control |
| 12/03/1991 | US5069286 Anionic polymer sequesterant |
| 12/03/1991 | US5069285 Dual wall well development tool |
| 12/03/1991 | US5069284 Wear resistant rod guide |
| 11/28/1991 | DE4017013A1 Equipment for cleaning well shafts - involves staged frame moving along shaft walls with horizontal dividers forming sealed chambers |
| 11/27/1991 | EP0457879A1 Device and method for cleaning an underground well. |
| 11/24/1991 | CA2017440A1 Pressure-operated oil and gas well swabbing device |
| 11/12/1991 | CA1291946C Arrangement for cleaning internal surface of casing strings |