| Patents for E21B 31 - Fishing for or freeing objects in boreholes or wells (3,788) |
|---|
| 03/13/1984 | US4436334 Releasing overshot apparatus |
| 03/06/1984 | CA1163189A1 Pulling tool |
| 02/16/1984 | WO1984000577A1 Hydraulic drilling jar |
| 02/14/1984 | US4431053 For fishing operations |
| 01/31/1984 | US4428441 Method of drilling a deviated wellbore |
| 01/24/1984 | US4427080 Apparatus for preventing differential sticking in wells |
| 01/24/1984 | US4427064 Wire line no-blow tool |
| 01/24/1984 | US4427061 Universal drift and retriever |
| 01/10/1984 | CA1160212A1 Hydraulic jarring tool |
| 01/10/1984 | CA1160211A1 Method and arrangement for improving cuttings removal and reducing differential pressure sticking of drill strings in wellbores |
| 01/03/1984 | US4423791 Method of inhibiting differential wall sticking in the rotary drilling of hydrocarbon wells |
| 12/27/1983 | US4422508 Methods for pulling sucker rod strings |
| 11/22/1983 | CA1157460A1 Downhole fishing jar mechanism |
| 08/30/1983 | US4401161 Oil well tool retrieving device |
| 08/24/1983 | EP0086582A1 Oil well packer retriever |
| 08/09/1983 | US4397494 Fishing tool to retrieve cables from wells |
| 08/04/1983 | WO1983002641A1 Oil well packer retriever |
| 08/02/1983 | US4396065 Pipe joint separation |
| 08/02/1983 | CA1151148A1 Double acting hydraulic mechanism |
| 07/26/1983 | US4394883 Well jar |
| 07/20/1983 | EP0083961A2 Improved jar tool for drill strings |
| 07/19/1983 | US4393940 Retrievable float valve assembly |
| 07/12/1983 | US4392528 Swabbing cup construction for swabbing an oil well pipe |
| 06/28/1983 | US4390064 Junk basket |
| 06/15/1983 | EP0081469A2 Attachment for a percussive rock drilling machine |
| 05/10/1983 | US4382623 Apparatus for retrieving fluid plug |
| 05/10/1983 | CA1146065A1 Methods and apparatus for severing conduits |
| 03/15/1983 | US4376468 Drilling jar |
| 03/09/1983 | EP0073610A2 Method and apparatus for drilling a well bore |
| 01/25/1983 | US4369977 Seal for an overshot and a method of doing same |
| 01/18/1983 | US4368911 Subsurface conduit setting and pulling tool |
| 01/04/1983 | US4366868 Rock drill apparatus |
| 11/30/1982 | US4361353 Method and apparatus for retrieving wear bushings of various diameters |
| 11/30/1982 | US4361195 Double acting hydraulic mechanism |
| 11/30/1982 | US4361193 Method and arrangement for improving cuttings removal and reducing differential pressure sticking of drill strings in wellbores |
| 10/27/1982 | EP0063471A1 Composition and method for releasing stuck drill pipes |
| 10/12/1982 | US4353585 Fishing tool to retrieve cables from wells |
| 09/07/1982 | CA1131209A1 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
| 08/31/1982 | US4346770 Hydraulic jarring tool |
| 08/19/1982 | WO1982002736A1 Pulling tool |
| 07/27/1982 | US4341272 Method for freeing stuck drill pipe |
| 07/27/1982 | CA1128493A1 Knuckel joint spearhead core drilling apparatus |
| 07/13/1982 | US4338999 Knockout pin trap |
| 06/22/1982 | CA1126128A1 Striking apparatus |
| 06/08/1982 | US4333542 Downhole fishing jar mechanism |
| 06/01/1982 | US4332410 Retrieving tool for well packer |
| 05/18/1982 | CA1123725A1 Well completion with casing gel |
| 05/13/1982 | WO1982001569A1 Well jar |
| 05/04/1982 | CA1122878A1 Sleeve valve hydraulic jar tool |
| 04/15/1982 | WO1982001213A1 Fishing tool to retrieve cables from wells |
| 04/06/1982 | US4323117 Method and means for emergency shearing and sealing of well casing |
| 03/30/1982 | US4321965 Self-aligning well tool guide |
| 02/23/1982 | CA1118754A1 Variable orifice sleeve valve hydraulic jar tool |
| 02/09/1982 | CA1117932A1 Long stroke jar bumper sub with safety sleeve |
| 12/15/1981 | CA1114360A1 Temperature compensating hydraulic jarring tool |
| 12/08/1981 | US4304428 Tapered screw joint and device for emergency recovery of boring tool from borehole with the use of said joint |
| 12/01/1981 | US4303138 Earth drilling lubricated hydraulic shock absorber and method |
| 11/10/1981 | US4299296 In-hole motor drill with bit clutch |
| 11/10/1981 | US4299279 Apparatus for sonically extracting oil well liners |
| 11/03/1981 | US4298078 Method of inhibiting sticking of well string |
| 11/03/1981 | US4298063 Methods and apparatus for severing conduits |
| 10/27/1981 | US4296822 Multipurpose fluid flow assisted downhole tool |
| 10/20/1981 | US4295796 Gas lift apparatus |
| 10/20/1981 | US4295535 In-hole motor drill with locking bit clutch |
| 10/06/1981 | US4292842 Tool for testing earth formations in boreholes |
| 09/08/1981 | US4287953 Method of removing conduit from curved borehole |
| 08/25/1981 | CA1107714A1 Temperature compensated sleeve valve hydraulic jar tool |
| 08/18/1981 | US4284153 Hydraulic drill string jar |
| 08/04/1981 | US4281725 Knuckle joint spearhead core drilling apparatus |
| 07/21/1981 | US4279304 Wire line tool release method |
| 07/07/1981 | US4276944 In-hole motor with bit clutch |
| 07/07/1981 | US4276931 Junk basket |
| 06/16/1981 | US4273372 Apparatus for use in lowering casing strings |
| 06/02/1981 | US4270385 Tool for testing earth formations in boreholes |
| 05/26/1981 | US4269279 Spheroidal plastic coated magnetizable particles and their use in drilling fluids |
| 04/14/1981 | US4261427 Long stroke jar bumper sub with safety sleeve |
| 03/25/1981 | EP0025650A1 Apparatus and method for recovering ground drilling equipment in a borehole |
| 03/24/1981 | US4257483 Method of well completion with casing gel |
| 03/17/1981 | US4256180 Method of moving a through-the-flowline installed safety valve through a curved flow line |
| 03/10/1981 | US4254983 Retriever tool |
| 03/03/1981 | US4253532 In-hole motor drill with locking bit clutch |
| 02/17/1981 | CA1095889A1 Well tool apparatus and method |
| 02/10/1981 | CA1095500A1 Variable hydraulic resistor jarring tool |
| 02/10/1981 | CA1095499A1 Hydraulic drill string jar |
| 01/27/1981 | US4246975 Wellbore drilling technique using eccentric tool joints to mitigate pressure-differential sticking |
| 01/13/1981 | CA1093457A1 Running tool |
| 12/30/1980 | US4241797 Impact tool for dislodging stuck drill bits |
| 12/10/1980 | EP0020091A1 Drilling jar |
| 12/02/1980 | US4236580 Method and apparatus for sonically extracting oil well liners |
| 11/11/1980 | US4232894 Selectively releasable overshot and pull tool |
| 11/11/1980 | US4232751 In-hole motor drill with bit clutch |
| 10/28/1980 | US4230587 Additive composition for release of stuck drill pipe |
| 10/28/1980 | US4230197 Bumping and jarring tool |
| 10/07/1980 | US4226289 Independent one-way acting hydraulic jar sections for a rotary drill string |
| 10/07/1980 | US4226285 Magnetic junk retriever |
| 09/30/1980 | US4225173 Cable retrieving tool |
| 08/19/1980 | US4217966 Junk basket, bit and reamer stabilizer |
| 07/29/1980 | CA1082682A1 Bumping and jarring tool |
| 07/08/1980 | US4211293 Variable orifice sleeve valve hydraulic jar tool |
| 07/01/1980 | US4210214 Temperature compensating hydraulic jarring tool |