Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129) |
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01/10/1990 | CN2050879U Pressing air countercirculatory sludging device |
01/09/1990 | US4892145 Well casing cleaning assembly |
12/12/1989 | US4886119 Method of and arrangement for driving volatile impurities from ground |
11/22/1989 | CN2048109U Rotary magnetizing device |
11/14/1989 | US4880057 Injecting reverse osmosis desalinization product water and carbon dioxide |
11/09/1989 | DE3907637A1 Rodless drilling, pressure or cleaning implement |
11/07/1989 | US4878539 Method and system for maintaining and producing horizontal well bores |
11/02/1989 | DE3812206A1 Apparatus for cleaning wells |
10/04/1989 | EP0335162A2 Method and device for decontaminating soil layers |
09/27/1989 | EP0333859A1 Device for cleaning pipelines |
09/26/1989 | US4869555 Apparatus for recovery of sulfur |
08/29/1989 | US4860831 Well apparatuses and methods |
08/29/1989 | US4860830 Method of cleaning a horizontal wellbore |
08/15/1989 | US4856590 Process for washing through filter media in a production zone with a pre-packed screen and coil tubing |
07/19/1989 | EP0324003A1 Method and apparatus for cleaning wells |
07/19/1989 | CN1034035A Internally installed fluid magnetic core |
07/05/1989 | EP0323307A1 Process for transporting a fluid which forms hydrates |
06/27/1989 | US4842070 Procedure for improving reservoir sweep efficiency using paraffinic or asphaltic hydrocarbons |
06/27/1989 | US4841846 Pneumatic actuators with liquid seals for oil and gas well swabs |
06/13/1989 | US4838354 Down hole oil field clean-out method |
06/13/1989 | US4838353 System for completing and maintaining lateral wells |
06/06/1989 | US4836286 Method for removal of flow-restricting matter from hydrocarbon producing wells |
05/23/1989 | CA1254505A1 Exploitation method for reservoirs containing hydrogen sulphide |
05/16/1989 | US4830112 Method and apparatus for treating wellbores |
05/16/1989 | US4830111 Water well treating method |
04/25/1989 | US4823880 Gaswell dehydrate valve |
04/25/1989 | US4823826 Process and apparatus for introducing aqueous chloride dioxide into high pressure water injection wells |
04/11/1989 | US4820422 Connecting into system casing filled with movable spheres |
04/06/1989 | WO1989002790A1 Device for cleaning pipelines |
04/04/1989 | US4817722 Automatic well treatment method |
03/29/1989 | EP0309186A1 Improved helically wound screen and method of making the same |
03/29/1989 | CN1032056A Fixed style multipurpose well clearer |
03/28/1989 | US4815538 Wash tool for well having perforated casing |
03/21/1989 | CA1251393A1 Method and apparatus for distributing fluids within a subterranean wellbore |
03/07/1989 | US4809793 Enhanced diameter clean-out tool and method |
03/07/1989 | US4809779 Arrangement for cleaning internal surface of casing strings |
03/01/1989 | EP0304712A2 Method of and device for removing volatile contaminants from the soil |
03/01/1989 | CN1031369A Polyalky leneoxyamine catalysts for dialkyl disulfides and/or polysulfides used in dissolving sulfur |
02/14/1989 | USRE32866 Method and apparatus for distributing fluids within a subterranean wellbore |
02/14/1989 | US4804485 Antifouling agents to prevent sulfur plugging in sour oil and gas wells |
01/24/1989 | US4799554 Pressure actuated cleaning tool |
01/24/1989 | CA1249218A1 Method and apparatus for injecting well treating liquid into the bottom of a reservoir interval |
01/18/1989 | CN2031034U Put-in type strong magnetic anti-wax device for petroleum artesian well |
01/17/1989 | US4798246 Pipe scraper |
01/11/1989 | EP0298663A2 Downhole cutting tool |
01/10/1989 | US4796697 Slip stream device |
12/29/1988 | WO1988010356A1 Method and apparatus for cleaning wells |
12/27/1988 | US4793417 Apparatus and methods for cleaning well perforations |
12/21/1988 | CN88103321A Sulfur dissolving composition |
12/20/1988 | US4791985 System to proportion assisting fluids in a well |
12/14/1988 | CN87103829A Clearing apparatus for internal surface of casing pipes |
12/13/1988 | CA1246480A1 Method of removing solid wax structures deposited in oil and gas facilities |
12/07/1988 | CN88212806U Trunk piston for oil well desintering wax |
12/06/1988 | CA1245978A1 Producing sour natural gas |
11/29/1988 | US4787457 Method and apparatus for rotating casing string segment |
11/29/1988 | US4787455 Method for scale and corrosion inhibition in a well penetrating a subterranean formation |
11/29/1988 | US4787448 Rod guide |
11/09/1988 | EP0289951A2 Sulfur dissolving composition |
11/09/1988 | EP0289950A2 Polyalkyleneoxyamine catalysts for dialkyl disulfides and/or polysulfides used in dissolving sulfur |
11/01/1988 | US4781250 For cleaning flow conductors |
10/25/1988 | US4779679 Sustained release of corrosion inhibitor by complexing with ion exchange resin |
10/18/1988 | US4778006 Process for removing carbonate from wells |
10/05/1988 | CN87215692U Self-closed ejection ball-shooting valve |
09/20/1988 | US4771675 Swabbing apparatus |
08/31/1988 | CN87213742U Sealing scraper |
08/23/1988 | US4765410 Method and apparatus for cleaning wells |
08/23/1988 | US4765405 Oil well casing perforation cleaning tool |
08/16/1988 | US4763728 Jet-type well screen cleaner |
08/02/1988 | US4760883 For perforating mineral producing zone in a wellbore |
07/19/1988 | US4757863 Well cleaning method and apparatus |
07/12/1988 | US4756371 Perforation apparatus and method |
07/12/1988 | US4756368 Method for drawing up special crude oil |
07/05/1988 | US4754810 Method for patching casing leaks |
06/21/1988 | US4751969 Apparatus and method for removing fluids from a well |
06/21/1988 | US4751870 Seals for gas and oil well swabs |
06/14/1988 | US4750558 Well bore cleaning tool |
05/31/1988 | US4747452 Wellbore cleaning device |
05/18/1988 | CN86106966A Composition for inhibiting inorganic salt scale formation |
05/17/1988 | US4744420 For exacuating solids |
04/19/1988 | US4738897 Polymer article and its use for controlled introduction of reagent into a fluid |
03/30/1988 | EP0261287A1 Fluid pressure actuated downhole apparatus |
03/23/1988 | CN86102133B Process for dissolution of sulphur and dissolvent therefor |
02/03/1988 | CN86105819A Flushing method for hydrographic and engineering geological well drilling |
01/12/1988 | CA1231301A1 Method for producing heavy, viscous crude oil |
01/06/1988 | CN87206273U Automatic pipe wiping mechanical device |
12/08/1987 | US4711299 Apparatus and methods for pumping solids and undesirable liquids from a well bore |
11/25/1987 | CN87203255U Mud sieve made of stainless steel wire by full welding |
11/24/1987 | US4708206 Removing particulate matter from a non-dissoluble sand control pack |
11/19/1987 | DE3616112A1 Apparatus for cleaning well pits and well pipes |
11/18/1987 | CN86209217U Tongue type wax scraper for mechanically cleaning wax in flowing oil well |
11/17/1987 | US4706748 Pipe scraping device |
11/10/1987 | US4705107 Apparatus and methods for cleaning a well |
11/03/1987 | US4703804 From a well casing |
10/31/1987 | CN86207314U Special oil drawing bar with retainer and wax scraper |
09/22/1987 | US4694908 Method and apparatus of injecting fluid into a well conduit by coil tubing |
09/22/1987 | US4694901 Apparatus for removal of wellbore particles |
09/22/1987 | CA1227227A1 Oil well evacuation system |
09/09/1987 | CN87100189A Extracting method of special crude oil |
09/09/1987 | CN85202752U Tri-purpose combined ball-projecting valve |
09/08/1987 | CA1226583A1 Process for preventing the precipitation of elementary sulfur in riser pipes of probes for natural gas |