| 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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| 10/28/1986 | US4619335 Enhanced circulation drill bit |
| 10/28/1986 | US4619052 Process and apparatus for drying and classifying particulate granulate material |
| 10/21/1986 | US4618008 Vertical drilling method and apparatus |
| 10/07/1986 | US4615564 Foam process for recovering underground rock fragments |
| 10/07/1986 | US4615399 Valved jet device for well drills |
| 10/07/1986 | US4615394 Inverse differential casing cementing float valve |
| 10/01/1986 | EP0196284A1 Well drilling apparatus |
| 09/30/1986 | US4614236 Self-breaking foamed oil-in-water emulsion for stimulation of wells blocked by paraffinic deposits |
| 09/30/1986 | CA1212042A1 Down hole blow out preventer and method of use |
| 09/23/1986 | US4613003 Apparatus for excavating bore holes in rock |
| 09/16/1986 | US4611950 Method and apparatus for removing contaminants from soil |
| 09/12/1986 | WO1986005231A1 Marine riser fill-up valve |
| 09/09/1986 | US4610161 Method and apparatus for determining fluid circulation conditions in well drilling operations |
| 09/09/1986 | CA1210928A1 Process for removing contaminates from a well fluid and well system |
| 08/27/1986 | EP0192622A2 Drilling equipment for percussive drilling |
| 08/27/1986 | EP0121566B1 Retrievable inside blowout preventer valve apparatus |
| 08/26/1986 | CA1210319A1 Geotechnical cone lubrication apparatus and method |
| 08/20/1986 | CN85202805U Device for simulating dynamic water loss of drilling slurry |
| 08/19/1986 | US4606415 Method and system for detecting and identifying abnormal drilling conditions |
| 08/19/1986 | US4606283 System for extracting contaminants and hydrocarbons from cuttings waste in oil well drilling |
| 08/19/1986 | CA1209901A1 Foam gravel packing in highly deviated wells |
| 08/13/1986 | EP0190529A1 Remotely controlled flow-responsive actuating device, in particular for actuating a stabilizer in a drill string |
| 08/05/1986 | US4604216 Drilling fluids |
| 08/05/1986 | CA1209009A1 Polyampholytes and their use |
| 07/29/1986 | US4602690 Detachable apparatus for preventing differential pressure sticking in wells |
| 07/16/1986 | EP0187637A2 A rotary head |
| 07/15/1986 | US4600515 Acrylamide-metal acrylate copolymers |
| 07/15/1986 | US4600508 Contamination removal system |
| 07/08/1986 | US4599172 Flow line filter apparatus |
| 07/08/1986 | US4599117 Drilling cuttings |
| 07/03/1986 | WO1986003798A1 Diverter/bop system and method for a bottom supported offshore drilling rig |
| 07/02/1986 | EP0185827A1 Aerated mud centrifuge |
| 07/02/1986 | CN85108190A Rotary head for drilling machine |
| 07/02/1986 | CA1206870A Valve |
| 07/02/1986 | CA1206737A Method of inhibiting differential wall sticking in the rotary drilling of hydrocarbon wells |
| 07/01/1986 | US4597447 Diverter/bop system and method for a bottom supported offshore drilling rig |
| 06/17/1986 | US4595422 Removing fluids and hydrocarbons from mixture by immersing solids in solution to remove hydrocarbons, agitating, shaking solids, centrifuging, heating to vaporize remaining fluids, discharging |
| 06/17/1986 | US4595343 Remote mud pump control apparatus |
| 06/11/1986 | EP0184411A2 Method and apparatus for treating wellbore drilling cuttings |
| 06/10/1986 | US4594170 Hydrogen peroxide |
| 06/10/1986 | US4593773 Well drilling assembly |
| 06/10/1986 | US4593772 Rotary cutter for cable following apparatus |
| 06/03/1986 | US4592425 Process to remove settled solids from completion brines |
| 05/28/1986 | EP0182600A2 Use of water soluble polymers in aqueous drilling or packer fluids and as detergent builders |
| 05/20/1986 | US4589495 Apparatus and method for inserting flow control means into a well casing |
| 05/20/1986 | US4589276 Method and apparatus for determining effectiveness of foamant in porous media |
| 05/13/1986 | US4588445 Washing, water, surfactant, alcohol, turbulence, fluid flow |
| 05/13/1986 | US4588036 Continuous, undisturbed sampling by rotational boring in non-plastic granular tills |
| 05/13/1986 | US4588035 Down hole blow out preventer and method of use |
| 05/13/1986 | US4588031 Well cementing process |
| 05/13/1986 | CA1204429A1 Separator sub |
| 05/13/1986 | CA1204382A1 Differential gas lift valve |
| 05/10/1986 | CN85108013A Apparatus and method for driving casing or conductor pipe |
| 05/09/1986 | WO1986002696A1 Marine riser well control method and apparatus |
| 05/06/1986 | US4587024 Cyclone separators |
| 04/29/1986 | US4585256 Side feed water swivel |
| 04/29/1986 | US4585080 Portable rotary earth drilling apparatus |
| 04/24/1986 | WO1986002403A1 Method and apparatus for combined jet and mechanical drilling |
| 04/22/1986 | US4583603 Drill pipe joint |
| 04/22/1986 | US4583601 Hammer drill |
| 04/22/1986 | CA1203529A1 Water separator and backflow valve |
| 04/22/1986 | CA1203471A1 Flow diverter |
| 04/22/1986 | CA1203450A1 Composition and method for cleaning oil from hard surfaces |
| 04/15/1986 | CA1203229A1 Method for operating rotary drilling under conditions of high cuttings transport efficiency |
| 04/15/1986 | CA1203161A1 Retrievable inside blowout preventer valve apparatus |
| 04/15/1986 | CA1203098A1 Arrangement for supplying a pressurized liquid to a rotating machine part |
| 04/10/1986 | WO1986002124A1 Device for controlling the locking of a sampling tube |
| 04/01/1986 | US4579668 Well servicing agents and processes |
| 03/26/1986 | EP0174972A1 Hammer for use in a bore hole and apparatus for use therewith. |
| 03/25/1986 | US4577892 Arrangement for supplying a pressurized liquid to a rotating machine part |
| 03/25/1986 | US4577702 Method of preventing drill string overflow |
| 03/25/1986 | US4577700 Method and system for displacing drilling fluid from a drill string in a well drilling system |
| 03/25/1986 | US4577688 Anionic ourfactants |
| 03/25/1986 | US4577662 Plug valve equipped with pressure equalization means |
| 03/25/1986 | US4577614 Blowout preventor apparatus |
| 03/18/1986 | US4576515 Pipe laying apparatus |
| 03/18/1986 | US4576358 Remotely operable safety valve |
| 03/18/1986 | CA1201906A1 Bore-hole hydraulics simulator |
| 03/11/1986 | US4575359 Rotary drive coupling |
| 03/11/1986 | US4574894 Ball actuable circulating dump valve |
| 03/11/1986 | CA1201653A1 Drilling choke valve |
| 03/04/1986 | US4573536 Method and apparatus for flushing a well |
| 02/25/1986 | US4572582 Earth battery using veined material such as coal as first electrode, and placing second electrode in metal to be mined |
| 02/25/1986 | US4571993 Cementing system including real time display |
| 02/19/1986 | EP0171962A2 Water-swellable clay composition |
| 02/19/1986 | EP0171852A1 Rotary drill bit |
| 02/18/1986 | US4571296 Two stage desilter |
| 02/18/1986 | US4570706 Device for handling rods for oil-well drilling |
| 02/18/1986 | US4570480 Method and apparatus for determining formation pressure |
| 02/12/1986 | EP0171335A1 Drilling rod joint, especially for traversing the zones of lost circulation |
| 02/12/1986 | CN85201390U Continuous measurement device for aq. drilling slurry density |
| 02/04/1986 | US4568392 Separation of water and clay by surfactant |
| 02/04/1986 | US4568126 Method and machine for removing blockage and silt from abandoned auger holes |
| 01/28/1986 | US4566494 Vent line system |
| 01/28/1986 | US4566478 Well safety and kill valve |
| 01/28/1986 | US4566318 Method for optimizing the tripping velocity of a drill string |
| 01/22/1986 | EP0169180A1 Dust collector hood for a rock drill |
| 01/21/1986 | US4565213 Ball valve device with hold-open tube |
| 01/15/1986 | EP0168368A1 Control method and control device for a down-the-hole rock drill |
| 01/15/1986 | EP0167686A1 Process for containment of liquids as solids or semisolids |