| Patents for E21B 21 - Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor (13,780) |
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| 11/15/1983 | US4415047 Downhole case driving apparatus for impact drills |
| 11/08/1983 | US4413688 Diverter valve |
| 11/08/1983 | US4413682 Method and apparatus for installing a cementing float shoe on the bottom of a well casing |
| 11/08/1983 | US4413511 System for measuring cuttings and mud carryover during the drilling of a subterranean well |
| 11/01/1983 | CA1156341A1 Apparatus for well logging while drilling |
| 10/25/1983 | US4411800 High temperature stable fluid loss control system |
| 10/25/1983 | US4411673 Fluid flow through tubes to central container while under vacuum; particularly for drilling muds |
| 10/18/1983 | US4410425 For drilling mud |
| 10/18/1983 | US4410052 Method of drilling a productive bed |
| 10/18/1983 | US4410041 Process for gas-lifting liquid from a well by injecting liquid into the well |
| 10/11/1983 | US4408669 Means for drilling |
| 10/11/1983 | US4408629 Valve modification for fluid pump valves |
| 10/11/1983 | US4408486 Bell nipple densitometer method and apparatus |
| 10/04/1983 | CA1154574A1 Method of binding dust and apparatus for carrying out the method |
| 09/29/1983 | WO1983003279A1 Combination clean-out and drilling tool |
| 09/28/1983 | EP0089599A1 Handling device for drilling rods |
| 09/27/1983 | US4406335 Special circulation sub |
| 09/27/1983 | US4406334 Drilling tool |
| 09/27/1983 | US4406332 Rotary earth boring tool |
| 09/27/1983 | US4406330 Method of binding dust |
| 09/20/1983 | US4405021 Apparatus for well logging while drilling |
| 09/14/1983 | EP0088705A1 Down-the-hole pneumatic hammer |
| 09/13/1983 | US4404112 Mixture of hydrocarbon oils and polysiloxane having end groups; fracturing; anticlogging agents; gas and oil wells |
| 09/13/1983 | US4404107 Raw cotton reacted with dry hydrochloric acid gas |
| 09/13/1983 | US4403628 Inside blowout preventer |
| 09/13/1983 | CA1153759A1 Drilling device for drilling a core in deep drill holes |
| 08/30/1983 | US4401171 Underreamer with debris flushing flow path |
| 08/30/1983 | US4401169 System for lagtime measurement during drilling |
| 08/23/1983 | US4400266 Method and apparatus for separating solid phase from drilling mud |
| 08/09/1983 | US4397659 Flowline degaser |
| 08/04/1983 | WO1983002568A1 Method and apparatus for treating waste rock cuttings |
| 07/27/1983 | EP0084411A1 Composition and method for cleaning hydrocarbon oil from hard surfaces |
| 07/26/1983 | US4395338 Straining, settling, boiling of drilling muds |
| 07/26/1983 | US4395061 Swivel unit |
| 07/26/1983 | US4394880 Method of preventing drill string overflow |
| 07/26/1983 | CA1150717A1 Method for drilling wellbores from an offshore platform |
| 07/26/1983 | CA1150675A1 Combined adhesion and ionic jet solids-from-drilling-mud separation system |
| 07/19/1983 | US4394140 Degassing system and centrifugal pump |
| 07/19/1983 | US4393940 Retrievable float valve assembly |
| 07/12/1983 | US4392527 Water well developing system |
| 07/12/1983 | CA1149776A1 Apparatus for electrokinetically separating drilling mud |
| 07/12/1983 | CA1149728A1 Drilling fluid cooling system |
| 07/05/1983 | US4391328 Drill string safety valve |
| 06/29/1983 | EP0082657A2 Polyampholytes and their use |
| 06/28/1983 | US4390284 Method and apparatus for wetting powder |
| 06/21/1983 | US4389319 High temperature stable viscosifier and fluid loss control system |
| 06/14/1983 | US4387775 Rock drilling apparatus |
| 06/14/1983 | US4387514 Method for drying oil well drill cuttings |
| 06/07/1983 | CA1147697A1 Method for maintaining present parameters of drilling mud |
| 06/07/1983 | CA1147646A1 Drilling fluid bypass for marine riser |
| 05/31/1983 | US4385666 Method of maintaining preset parameters of drilling mud |
| 05/24/1983 | US4384961 Process for filtration of aqueous oil-containing brines |
| 05/24/1983 | US4384624 Earth boring head |
| 05/24/1983 | US4384615 Method of mixing fluids in a well bore |
| 05/10/1983 | US4382341 Method for drying drilling mud |
| 05/10/1983 | CA1146274A1 Method of monitoring structural and mechanical properties of drilling mud and device for realizing same |
| 05/10/1983 | CA1146163A1 Multi-stage centrifugal mixer |
| 05/10/1983 | CA1146123A1 Method of separating adhesive-type particles from drilling mud using counter-rotating coated rollers |
| 05/03/1983 | CA1145644A1 Fluid pressure actuated by-pass and relief valve |
| 04/26/1983 | US4381191 Drilling mud degasser |
| 04/26/1983 | CA1145326A1 Cylindrical and orthogonal-spiral mixing flow system for particulates and liquids |
| 04/19/1983 | US4380264 Survey tool string |
| 04/05/1983 | US4378818 Well drilling float valve |
| 04/05/1983 | CA1144065A1 Methods and apparatus for controlling fluid flow |
| 03/31/1983 | WO1983001087A1 Apparatus for well logging while drilling |
| 03/31/1983 | WO1983001014A1 Proces for filtration of oil and gas well treatment fluids |
| 03/30/1983 | EP0075185A2 Dust evacuation for a hollow drill |
| 03/29/1983 | US4378057 Coupling structure for a compound drill stem |
| 03/29/1983 | US4378056 Method and apparatus for balancing discharge fluid flow in drilling mud treatment units |
| 03/29/1983 | CA1143823A1 Drilling orientation tool |
| 03/22/1983 | US4377213 Dual bushing centralizer |
| 03/22/1983 | US4377179 Pressure balanced ball valve device |
| 03/22/1983 | US4377177 Throttling mud choke apparatus |
| 03/15/1983 | US4376467 Seafloor diverter |
| 03/08/1983 | US4376050 Surge devices for liquid-solid separators |
| 02/22/1983 | CA1141658A1 Method of controlling an erupted marine oil well |
| 02/15/1983 | US4373592 Rotary drilling drill string stabilizer-cuttings grinder |
| 02/15/1983 | US4373582 Acoustically controlled electro-mechanical circulation sub |
| 02/08/1983 | US4372402 Combination fluid nozzle and backflow valve |
| 02/08/1983 | US4372399 Drill bit with wedge shaped eduction jets |
| 02/08/1983 | CA1140777A1 Method for controlling the dispersing of solids in drilling mud |
| 02/01/1983 | US4371958 Drilling orientation tool |
| 02/01/1983 | US4371626 Method of upgrading crude sodium bentonite |
| 02/01/1983 | US4371045 Method and apparatus for recovering unstable cores |
| 02/01/1983 | US4370885 Method for controlling the dispersing of solids in drilling mud |
| 02/01/1983 | CA1140323A1 Method for treating oil-contaminated drill cuttings from a well drilling operation particularly at an offshore location |
| 01/25/1983 | US4369844 Method using lost circulation material for sealing permeable formations |
| 01/25/1983 | CA1140107A1 Kelly valve |
| 01/18/1983 | US4368787 Arrangement for removing borehole cuttings by reverse circulation with a downhole bit-powered pump |
| 01/18/1983 | US4368785 Well point and method of driving same |
| 01/11/1983 | US4367794 Acoustically actuated downhole blowout preventer |
| 01/11/1983 | CA1139297A1 Turbo-coring device equipped with a following pipe |
| 01/04/1983 | CA1138771A1 Drill string safety and kill valve |
| 12/28/1982 | US4366063 Process and apparatus for recovering usable water and other materials from oil field mud/waste pits |
| 12/28/1982 | US4365977 Drilling mud degasser |
| 12/28/1982 | US4365507 Method of determining the depth of occurrence of a chemically aggressive bed |
| 12/28/1982 | CA1138416A1 Method and a machine of obtaining samples from the ground to determine its composition |
| 12/23/1982 | WO1982004435A1 Process and apparatus for recovering usable water and other materials from oil field mud/waste pits |
| 12/21/1982 | US4364407 Mud saver valve |
| 12/14/1982 | US4363367 Large diameter drill bit |