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