| 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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| 10/06/1999 | CN2342090Y Mud tank with purifier |
| 10/06/1999 | CN1231017A Drill shank for drill drive |
| 10/05/1999 | US5963138 Apparatus and method for self adjusting downlink signal communication |
| 10/05/1999 | US5961836 Method of producing milling adjuvants and/or dispersive agents, by physicochemical separation; adjuvants and agents thus obtained; and uses of same |
| 10/05/1999 | US5961438 Method and apparatus for the injection disposal of solid and liquid waste materials into subpressured earth formations penetrated by a borehole |
| 10/05/1999 | US5960881 Downhole surge pressure reduction system and method of use |
| 09/30/1999 | WO1999049180A1 Blowout preventer |
| 09/30/1999 | WO1999049173A1 Rotating subsea diverter |
| 09/30/1999 | WO1999049172A1 Offshore drilling system |
| 09/30/1999 | DE19813087A1 Drilling device with tubular outer drill stem through which injection drill stem extends |
| 09/30/1999 | CA2326358A1 Rotating subsea diverter |
| 09/30/1999 | CA2326129A1 Offshore drilling system |
| 09/29/1999 | EP0944421A1 Apparatus and method for separation of solids from liquid |
| 09/29/1999 | CN2340890Y Pressure reducer at bottom of well |
| 09/28/1999 | US5957226 Reverse circulation drilling system with hexagonal pipe coupling |
| 09/28/1999 | US5957197 Downhole cut-off valve used for cementing |
| 09/28/1999 | CA2173350C Apparatus for testing a shear thickening plugging fluid |
| 09/23/1999 | WO1999047789A1 Pressure actuated downhole tool |
| 09/22/1999 | CN2339744Y Underground continuous flush-washing device |
| 09/21/1999 | US5955401 Dry mixture of pre-gelatinized corn starch and synthetic biopolymer added to salt-free water as fluid for drilling horizontal wells for in situ bioremediation of contaminated groundwater |
| 09/21/1999 | US5954967 Separation of water soluble, neutralized anionic vinyl, acrylic, or condensation polymer through organic or mineral membrane into different molecular weight fractions |
| 09/16/1999 | WO1999046475A1 Oil and gas well cuttings disposal system with continuous vacuum operation for sequentially filling disposal tanks |
| 09/16/1999 | WO1999046474A1 Expandable tank for separating particulates from drilling fluid and method |
| 09/16/1999 | DE19810912A1 Saug- und Austraggerät für eine Spülflüssigkeit Suction and dispensing a washing liquid |
| 09/16/1999 | DE19810193A1 Bohrwerkzeug Drilling tool |
| 09/15/1999 | EP0941828A2 Liquid dispersing and suction device |
| 09/15/1999 | EP0941793A2 Drilling tool |
| 09/15/1999 | CN1228824A System for directional control of drilling |
| 09/11/1999 | CA2265039A1 Apparatus for removal of milling debris |
| 09/10/1999 | WO1999045232A1 A mill and a method for milling |
| 09/10/1999 | WO1999045228A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 09/10/1999 | WO1999045227A1 Method for removal of cuttings from a deviated wellbore drilled with coiled tubing |
| 09/10/1999 | CA2322287A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 09/01/1999 | EP0939193A2 Auto-fill sub |
| 08/31/1999 | US5945385 Method and composition for reducing torque in downhole drilling |
| 08/31/1999 | US5944263 Dust suppressing misting device for percussive tools |
| 08/31/1999 | US5944195 Method for separation of solids from drilling fluids by magnetic separation and centrifugation |
| 08/31/1999 | US5944122 Subterranean drilling mechanism |
| 08/26/1999 | WO1999042701A1 Apparatus and method for downhole fluid phase separation |
| 08/26/1999 | WO1999042696A1 Method and system for drilling and completing underbalanced multilateral wells |
| 08/26/1999 | WO1999011903A9 Bypass valve for downhole motor |
| 08/24/1999 | US5941322 Directional boring head with blade assembly |
| 08/18/1999 | EP0936344A2 System and method for treatment of drilling or completion fluid |
| 08/18/1999 | EP0912651A4 Clay-free biodegradable wellbore fluid and method for using said fluid |
| 08/18/1999 | EP0828923B1 Device for controlling the weight on an earth drill bit |
| 08/17/1999 | US5937957 Cutting bed impeller |
| 08/12/1999 | WO1999040292A1 Cleaning of drill cuttings and apparatus therfor |
| 08/12/1999 | CA2319016A1 Cleaning of drill cuttings and apparatus therefor |
| 08/11/1999 | CN2332811Y Sludger and well-rig arranged with such a sludger |
| 08/11/1999 | CN2332810Y Noozle |
| 08/10/1999 | US5934389 Method for increasing hydraulic efficiency of drilling |
| 08/10/1999 | US5934388 Method for measurement of the air flow in rock drill bits |
| 08/05/1999 | WO1999039076A1 Method and apparatus for boring through a solid material |
| 08/04/1999 | EP0932745A1 Continuous circulation drilling method |
| 08/04/1999 | EP0932438A1 Improved shale shaker |
| 08/04/1999 | EP0693004B1 Screen for separating solids from drilling fluid |
| 08/02/1999 | CA2260547A1 A percussive down-the-hole hammer and a drill bit |
| 07/29/1999 | WO1999037396A1 Microencapsulated drag reducing agents |
| 07/27/1999 | US5928519 Controlling operating pressure in high pressure separator which receives bore hole fluid by controlling the outflow of gas from separator in response to pressure variations within bore hole during under-balanced drilling |
| 07/27/1999 | US5927970 Apparatus for recovering hydrocarbons from solids |
| 07/27/1999 | US5927439 Sub-assembly for lubricating rock drill bit |
| 07/27/1999 | US5927402 Down hole mud circulation for wireline tools |
| 07/21/1999 | EP0929731A1 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 07/21/1999 | EP0929619A1 Invert emulsion fluids suitable for drilling |
| 07/15/1999 | WO1999035365A2 Downhole pressure intensifier for jet cutting |
| 07/14/1999 | EP0928876A1 Device for drilling a bore hole in the ground |
| 07/14/1999 | EP0928360A1 Drill shank for a drill drive |
| 07/14/1999 | CN1222634A Collider |
| 07/08/1999 | WO1999034091A1 Mud circulation for lithosphere drilling |
| 07/08/1999 | WO1999034090A1 Off-line mud circulation during lithosphere drilling |
| 07/08/1999 | WO1999023345A3 Mill for use in a wellbore and method of milling |
| 07/07/1999 | EP0927295A2 Wellbore milling system |
| 07/07/1999 | EP0927294A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 07/06/1999 | US5919358 Continuous-belt drilling mud separation system |
| 07/06/1999 | US5918677 Method of and apparatus for installing the casing in a well |
| 07/06/1999 | US5918674 Casing and method of installing the casing in a well |
| 07/06/1999 | US5918673 Method and multi-purpose apparatus for dispensing and circulating fluid in wellbore casing |
| 07/01/1999 | WO1999015758A3 Subsea drill fluid pumping and treatment system for deepwater drilling |
| 06/30/1999 | EP0906487A4 A system for directional control of drilling |
| 06/30/1999 | CN2326724Y Oil-well casing-pipe righting and spiral-flow generating apparatus |
| 06/30/1999 | CN1221445A Clay-free biodegradable wellbore fluid and method for using said fluid |
| 06/29/1999 | US5915894 Core drill |
| 06/24/1999 | WO1999031351A1 Well isolation system |
| 06/24/1999 | WO1999031349A1 Method and apparatus for cementing casing in a wellbore |
| 06/24/1999 | WO1999031347A1 Arrangement in a separator |
| 06/22/1999 | US5913372 Oil and gas well cuttings disposal system with continuous vacuum operation for sequentially filling disposal tanks |
| 06/17/1999 | WO1999029996A1 Percussive tool |
| 06/16/1999 | EP0750715B1 Valve for use in float equipment |
| 06/16/1999 | EP0692062B1 Down-hole hammer drill having reverse circulation and drill bit for the hammer drill |
| 06/16/1999 | CN1219992A Flow diverter ring for rotary drill bit and its method |
| 06/16/1999 | CN1219638A Lower drilling rig combination and its drilling method |
| 06/15/1999 | US5911285 Erosion resistant downhole mud diverter tool |
| 06/15/1999 | CA2133430C Sub-assembly for dust suppression in rock drilling |
| 06/10/1999 | WO1999028592A1 Methods and apparatus for controlling an air compressor in a drill string flushing system |
| 06/10/1999 | WO1999028591A1 Closed device for treatment of drilling fluids and cuttings |
| 06/10/1999 | CA2309672A1 Methods and apparatus for controlling an air compressor in a drill string flushing system |
| 06/09/1999 | EP0920484A1 Improved oil-based drilling fluid |
| 06/09/1999 | EP0861309A4 Method for extracting oil from oil-contaminated soil |
| 06/09/1999 | EP0847477A4 Drill bit with set of underreamer arms |
| 06/09/1999 | EP0735928B1 Contaminant removal |