| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
|---|
| 10/31/1978 | US4123367 Method of reducing drag and rotating torque in the rotary drilling of oil and gas wells |
| 10/24/1978 | US4121673 Drilling and installation system |
| 10/24/1978 | US4121664 Aminoethylsulfate salt and fatty acid salt |
| 10/17/1978 | US4120816 Defoaming apparatus |
| 10/17/1978 | US4120369 Method for drilling a well through unconsolidated dolomite formations |
| 10/17/1978 | US4120368 Supplying motive fluid to below ground tool drive from a pressurized bore hole |
| 10/10/1978 | CA1040110A1 Drilling mud degasser apparatus and method |
| 10/10/1978 | CA1040096A1 Wellpoint jetting head |
| 09/26/1978 | US4116288 Method and apparatus for continuously separating lost circulating material from drilling fluid |
| 09/26/1978 | US4116285 Process and apparatus for producing deep boreholes |
| 09/19/1978 | US4114705 Rock drilling tool having pulsed jets |
| 09/19/1978 | US4114704 Down hole well drilling tool with reversible thrust bearings |
| 09/19/1978 | US4114703 Well drilling tool having sealed lubrication system |
| 09/19/1978 | US4114702 Well drilling tool with lubricant level indicator |
| 09/12/1978 | US4113236 Pulling tool apparatus |
| 09/05/1978 | US4111829 Device for destroying foam |
| 09/05/1978 | CA1037797A1 Sampling airhammer apparatus |
| 08/29/1978 | US4110688 Method and apparatus for pipe joint locator, counter and displacement calculator |
| 08/22/1978 | US4108619 Degasser spray vessel |
| 08/22/1978 | US4108257 Apparatus for controlling a well during drilling operations |
| 08/22/1978 | US4108203 Check valve assembly |
| 08/15/1978 | US4106575 Tool string and means for supporting and rotating the same |
| 08/08/1978 | US4105461 Thickening compositions containing xanthan gum, guar gum and starch |
| 08/01/1978 | US4103749 Downhole cleaner assembly for petroleum wells |
| 08/01/1978 | US4103745 Portable drilling machine |
| 07/25/1978 | US4102418 Borehole drilling apparatus |
| 07/25/1978 | US4102413 Rock drilling apparatus and method |
| 07/18/1978 | US4100982 Drill cuttings separation and control apparatus |
| 07/18/1978 | US4100981 Earth boring apparatus for geological drilling and coring |
| 07/11/1978 | US4099583 Gas lift system for marine drilling riser |
| 07/11/1978 | US4099582 Drilling fluid compensation device |
| 07/11/1978 | US4099536 Method and apparatus for controlling a surging flow in a closed conduit |
| 07/04/1978 | US4098698 Compressed air, decompression |
| 07/04/1978 | US4098361 Drilling head connection for use in a reverse circulation system |
| 07/04/1978 | CA1034111A1 Hammer drills |
| 06/27/1978 | US4097253 Mud degasser trough |
| 06/27/1978 | US4097249 Method of fluid degassing |
| 06/13/1978 | US4094364 Percussion drill rod |
| 05/30/1978 | US4092407 Firing iron oxide solids, fluidized beds, cooling |
| 05/30/1978 | US4091988 Centrifugal trap for solid particles |
| 05/30/1978 | US4091881 Artificial lift system for marine drilling riser |
| 05/30/1978 | US4091631 System and method for installing production casings |
| 05/30/1978 | CA1032154A1 Exploration boring method and use thereof |
| 05/23/1978 | US4090573 Wireline sealing apparatus and method for use with a drill string |
| 05/23/1978 | US4090523 System for automatically flushing hydrocyclones used in drilling mud treatment |
| 05/09/1978 | US4088457 Degasification system |
| 05/09/1978 | US4088154 Automatically controlled desurging system |
| 05/02/1978 | US4086971 Riser pipe inserts |
| 04/18/1978 | US4084946 Drilling mud degasser |
| 04/18/1978 | US4084648 Process for the high-pressure grouting within the earth and apparatus adapted for carrying out same |
| 03/28/1978 | US4081041 Dust-collecting head |
| 03/07/1978 | US4077777 Neutralization of gases |
| 03/07/1978 | US4077671 Subterranean drilling and slurry mining method |
| 03/07/1978 | US4077481 Subterranean mining apparatus |
| 02/28/1978 | US4076083 Method and apparatus for controlling a well during drilling operations |
| 02/21/1978 | USRE29541 Hydraulic drilling rig and power swivel |
| 02/21/1978 | US4074779 Backwashing system for slurry pick-up used in hydraulic borehole mining devices |
| 02/21/1978 | US4074761 Drilling tool |
| 02/14/1978 | CA1026315A1 Improved boring tool |
| 02/07/1978 | US4072166 Valve apparatus for deep drilling |
| 01/10/1978 | US4067617 Subterranean drilling and slurry mining |
| 01/10/1978 | US4067540 Segmented plug valve |
| 01/10/1978 | US4067358 Indexing automatic fill-up float valve |
| 01/03/1978 | US4066139 Sampling drill |
| 12/27/1977 | US4064951 Underreamer having cutter arm position indication |
| 12/20/1977 | US4063603 Drilling fluid lubricant |
| 12/20/1977 | US4063602 Drilling fluid diverter system |
| 12/20/1977 | US4063386 Restoration of drilling mud-pits |
| 11/29/1977 | US4060140 Method and apparatus for preventing debris build-up in underwater oil wells |
| 11/29/1977 | US4060130 Cleanout procedure for well with low bottom hole pressure |
| 11/22/1977 | US4059533 Sodium dithionate |
| 11/22/1977 | US4059279 Hollow percussion drill rod with seal for cleaning fluid inlet tube |
| 11/22/1977 | US4059166 Subterranean drilling and slurry mining |
| 11/22/1977 | US4059155 Junk basket and method of removing foreign material from a well |
| 11/15/1977 | US4058163 Selectively actuated vibrating apparatus connected with well bore member |
| 11/08/1977 | US4057118 Bit packer for dual tube drilling |
| 11/08/1977 | US4057115 Flexible shaft for a roof drill |
| 10/25/1977 | US4055224 Method for forming an underground cavity |
| 09/20/1977 | US4049066 Apparatus for reducing annular back pressure near the drill bit |
| 09/20/1977 | US4049015 Check valve assembly |
| 09/13/1977 | US4048077 Aqueous clay base mud for deep drilling |
| 09/13/1977 | US4047581 Multistage, downhole, turbo-powered intensifier for drilling petroleum wells |
| 09/13/1977 | US4047580 High-velocity jet digging method |
| 09/13/1977 | US4047579 Sea drilling jig |
| 09/06/1977 | US4046528 Degassing system |
| 09/06/1977 | US4046191 Subsea hydraulic choke |
| 08/30/1977 | US4045084 In-situ mining of copper and nickel |
| 08/30/1977 | US4044834 Apparatus and method for controlling the flow of fluids from a well bore |
| 08/23/1977 | US4043193 Method and apparatus for measuring volume and density of fluids in a drilling fluid system |
| 08/23/1977 | US4043136 System and method for installing production casings |
| 08/09/1977 | US4040866 Laundering of oil base mud cuttings |
| 08/09/1977 | US4040666 Apparatus and method of shield excavation |
| 08/09/1977 | US4040494 Drill director |
| 08/09/1977 | US4040488 Differential valve |
| 08/09/1977 | US4040441 Check valve assembly |
| 07/19/1977 | US4036308 Apparatus for removing the drillings from the drilling site of a drill |
| 06/28/1977 | US4031970 Borehole drilling apparatus |
| 06/28/1977 | US4031957 Method and apparatus for testing and treating well formations |
| 06/21/1977 | US4031306 Polygalactomannan allyl ether compositions |
| 06/21/1977 | US4030558 Wear determination of drilling bits |