Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 37 - Methods or apparatus for cleaning boreholes or wells
Patents for E21B 37 - Methods or apparatus for cleaning boreholes or wells (5,129)
07/1983
07/19/1983US4393930 Subterranean well pressure surging tool
07/19/1983US4393927 Apparatus for positioning a treating liquid at the bottom of a well
07/19/1983CA1150324A1 Acid dissolvable cements and methods of using the same
07/12/1983US4392529 Method of cleaning a well and apparatus thereof
07/12/1983US4392528 Swabbing cup construction for swabbing an oil well pipe
07/12/1983US4392527 Water well developing system
07/05/1983US4391324 Geothermal well head and actuator assembly
05/1983
05/10/1983US4382470 Method and well casing
03/1983
03/22/1983CA1143283A1 Swab cup having an internal reinforcing member
12/1982
12/07/1982CA1136984A1 Chemical process for backsurging fluid through well casing perforations
11/1982
11/02/1982US4356865 Pump plug for use in well operations
10/1982
10/12/1982CA1133385A1 Gravel pack tool
09/1982
09/21/1982US4350204 Reamer
09/14/1982US4349073 Hydraulic jet well cleaning
08/1982
08/10/1982US4343518 Rod guide apparatus
08/10/1982US4343356 Method and apparatus for treating subsurface boreholes
08/05/1982WO1982002573A1 Methods and apparatus for well investigation and development
06/1982
06/22/1982US4335788 With calcium carbonate or barium carbonate used to control expansion
06/22/1982CA1126007A1 Scavenging hydrogen sulfide in an oil well
06/01/1982US4332296 Well cleaning tool
05/1982
05/11/1982US4328865 Wax control in oil wells using a thermal syphon system
03/1982
03/16/1982US4319518 Well swab cups
03/09/1982CA1119356A1 Method for removing elemental sulfur from high temperature, high pressure wells and flow lines
03/02/1982US4317407 Swab cup having an internal reinforcing member
12/1981
12/29/1981CA1115008A1 Slug and wipe tool
12/22/1981US4306428 Torque drive mechanism
11/1981
11/10/1981US4299282 Well cleaner
10/1981
10/06/1981US4293037 Method of forming and assembling a self-cleaning helical spring screen
09/1981
09/29/1981US4291764 Well casing scraping apparatus
09/29/1981US4291763 Dispenser for oil well treating chemicals
09/29/1981US4291433 Apparatus for steam cleaning liners in oil well bores and the like
09/15/1981US4289633 Nitrogen gas-generating reactants, reaction-retarding alkaline buffer, and ph-reducing reactant capable of overriding buffer
09/15/1981US4289204 Solar heat treating of well fluids
09/08/1981US4287948 Tubular member interior wiper
08/1981
08/25/1981US4285402 Method and apparatus for stimulating oil well production
07/1981
07/28/1981US4280557 Sonic apparatus for cleaning wells, pipe structures and the like
07/21/1981US4279306 Well washing tool and method
07/21/1981US4279299 Apparatus for installing condition-sensing means in subterranean earth formations
07/07/1981US4277348 Cleaning sand from filter in oil well in situ
06/1981
06/23/1981US4274484 Dump valve
06/16/1981US4273192 Method for cleaning a sand screen
06/10/1981EP0029842A1 Removing elemental sulfur from high temperature, high pressure wells
06/09/1981CA1102690A1 Reinforced seal unit for pumpdown pistons or well swabs
05/1981
05/19/1981US4267888 Method and apparatus for positioning a treating liquid at the bottom of a well
05/05/1981US4265459 Swab cup reinforcing member support
05/05/1981US4265312 Method for developing water wells
04/1981
04/07/1981US4260020 Method and tool for controlling fluid flow from a tubing string into a low pressure earth formation
04/07/1981US4260016 Self-cleaning helical spring sand screen
03/1981
03/10/1981US4254962 Swab cup having long and short reinforcing members
03/03/1981US4253522 Gravel pack tool
02/1981
02/24/1981US4252655 Scavenging hydrogen sulfide in an oil well
02/17/1981US4250965 Well treating method
02/10/1981US4249292 Method of assembling self-cleaning helical spring filter
02/03/1981US4248717 Method for removing elemental sulfur from high temperature, high pressure wells and flow lines
12/1980
12/16/1980US4239084 Acid soluble coating for well screens
12/11/1980WO1980002720A1 Removing elemental sulfur from high temperature,high pressure wells
12/10/1980EP0019993A1 Tubular member interior wiper
12/09/1980US4237978 Method for cleaning a helical spring sand screen in a well
12/09/1980US4237977 Removal of water from gas well borehole with solid foaming agent
10/1980
10/28/1980CA1088417A1 Device for cleaning widening and repairing of wells
10/14/1980US4227576 Method for cleaning a helical spring sand screen
10/14/1980US4227573 Reinforced seal unit for pumpdown pistons or well swabs
09/1980
09/30/1980US4224993 Dewaxing valve for use in oil wells
09/23/1980US4223724 Device for cleaning, widening and repairing wells of drinking water and irrigation water
09/23/1980CA1086134A1 Subsurface pumping installation for handling viscous or sand-laden fluids
09/09/1980US4221264 Tubular interior wiper
08/1980
08/26/1980US4219083 Nitrogen gas-generating reactants, reaction-retarding alkaline buffer, ph-reducing reactant
07/1980
07/15/1980US4212354 Method for injecting carbon dioxide into a well
07/15/1980CA1081611A1 Well bore cleaning tool
07/08/1980US4211280 Downhole surge tools, method and apparatus
05/1980
05/06/1980US4201266 Rotatable washer self-cleaning helical spring screen and methods
04/1980
04/29/1980US4200150 Methods and hydraulically expandable self-cleaning sand screens
04/22/1980US4199272 System for recharging aquifer and apparatus therefor
04/15/1980US4197910 Jet device for use in wells
03/1980
03/04/1980US4191493 Method for the production of a cavity limited by a flexible material
02/1980
02/26/1980US4190113 Well cleanout tool
02/26/1980US4190108 Swab
02/19/1980US4189000 Casing scraper
02/05/1980CA1071098A1 Cleanout procedure for well with low bottom hole pressure
01/1980
01/29/1980US4185690 Backsurge well cleaning tool
12/1979
12/25/1979US4180463 Self-cleaning helical spring filter and methods
10/1979
10/02/1979US4169483 Hydraulic jet drill stem and bit unplugging device
09/1979
09/18/1979CA1062608A1 Automated bailing apparatus in flexible combination for bailing shallow wells
09/11/1979CA1062155A1 Knock-out tool
09/11/1979CA1062154A1 Centering devices for cleaning tools and the like
07/1979
07/31/1979US4162705 Center section for oil well perforation testing device
07/24/1979US4161985 Tool for removing fluids and loose material from an earth formation
07/03/1979US4159742 Well bore cleaning tool
03/1979
03/06/1979US4142583 Well tool pack-off with sinker bar release means
11/1978
11/28/1978US4127164 Heat exchange apparatus
09/1978
09/19/1978CA1038751A2 Molded plastic paraffin scrapers and centralizers, and method and apparatus for manufacture of the same
08/1978
08/15/1978US4106182 Method of manufacturing an oilwell swab cup
08/01/1978US4103743 Method and means of treating water wells
08/01/1978US4103741 Oil well perforation testing device
07/1978
07/11/1978US4099451 Oilwell swab cup
07/04/1978US4098340 Method of and apparatus for cleaning down well valves of well pumps in situ
05/1978
05/09/1978US4088191 High pressure jet well cleaning
05/09/1978US4088185 For oil wells
03/1978
03/28/1978US4081185 Oil well swab cup
02/1978
02/21/1978US4074779 Backwashing system for slurry pick-up used in hydraulic borehole mining devices
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