| 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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| 05/15/2001 | US6230824 Rotating subsea diverter |
| 05/15/2001 | US6230811 Internal pressure operated circulating valve with annulus pressure operated safety mandrel |
| 05/15/2001 | CA2009734C Device in impact machines |
| 05/10/2001 | WO2001033045A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | WO2001033044A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/10/2001 | WO2001033029A2 Sub sea bottom hole assembly change out system and method |
| 05/10/2001 | CA2376544A1 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 05/09/2001 | EP1019611A4 Bypass valve for downhole motor |
| 05/08/2001 | US6227467 Dispersing solid materials entrained in liquid; multi-shear rotary grinder; drive shaft connected to rotating attrition plate; hazardous wastes |
| 05/02/2001 | EP1075582A4 Subsea mud pump |
| 05/02/2001 | CN2428564Y Jet-flow well-washing apparatus |
| 05/02/2001 | CN2428563Y Drilling-liquid purifying apparatus |
| 05/01/2001 | US6224534 Treatments for cuttings from offshore rigs |
| 05/01/2001 | US6223906 Flow divider box for conducting drilling mud to selected drilling mud separation units |
| 05/01/2001 | US6223839 Hydraulic underreamer and sections for use therein |
| 05/01/2001 | US6223823 Method of and apparatus for installing casing in a well |
| 04/25/2001 | EP1093540A1 Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 04/25/2001 | EP0928360B1 Drill shank for a drill drive |
| 04/24/2001 | US6221152 Stable suspension of hydrocolloids |
| 04/24/2001 | US6220445 Self-cleaning continuous-belt drilling mud separation system |
| 04/24/2001 | US6220373 Drill rod with axial air passageway and method of making same |
| 04/24/2001 | US6220079 Annular fluid manipulation in lined tubular systems |
| 04/22/2001 | CA2444789A1 Low shear treatment for the removal of free hydrocarbons, including bitumen, from cuttings |
| 04/22/2001 | CA2306523A1 Low shear treatment for the removal of free hydrocarbons, including bitumen, from cuttings |
| 04/18/2001 | EP1092080A1 Method and tool for fracturing an underground formation |
| 04/18/2001 | CN1291678A Method and treater for using waste fume as circulated medium in drilling or repairing well |
| 04/18/2001 | CA2286872A1 Hydraulically operated pressure relief valve |
| 04/17/2001 | US6218342 Oil-based drilling fluid |
| 04/17/2001 | US6216801 Method and apparatus for providing proportional injection of additives into drilling fluids |
| 04/17/2001 | US6216800 In-situ drilling system with dust collection and overload control |
| 04/17/2001 | US6216799 Subsea pumping system and method for deepwater drilling |
| 04/14/2001 | CA2326084A1 Methods of drilling a bore hole and dehydrating drilling fluids |
| 04/12/2001 | WO2001025595A1 Underbalanced perforation |
| 04/10/2001 | US6214219 Knock-down separation of emulsions |
| 04/10/2001 | US6213227 Oil and gas well cuttings disposal system with continous vacuum operation for sequentially filling disposal tanks |
| 04/05/2001 | WO2001007748A3 Mechanism for dropping a plurality of balls into tubulars |
| 04/04/2001 | EP1088962A2 Floating apparatus for use in a well casing |
| 04/04/2001 | EP1088582A2 Method of screening using a shale shaker |
| 04/04/2001 | CN1289890A Calibration of hydraulic pressure with isodensity |
| 04/04/2001 | CN1064106C Lower drilling assembly and drilling method therefor |
| 04/03/2001 | US6211119 Multiphase lubricant concentrates for use in water based systems in the field of exploratory soil drilling |
| 04/03/2001 | US6209666 Percussive down-the-hole hammer and a piston and drill bit therefor |
| 04/03/2001 | US6209665 Reverse circulation drilling system with bit locked underreamer arms |
| 04/03/2001 | US6209663 Underbalanced drill string deployment valve method and apparatus |
| 04/03/2001 | US6209636 Wellbore primary barrier and related systems |
| 03/29/2001 | WO2001022050A1 Method and system for extracting, analysing and measuring constituents transported by a bore fluid |
| 03/29/2001 | WO2001021931A1 Method for installing a well casing into a subsea well |
| 03/29/2001 | WO2000066872A8 Abrasive jet drilling assembly |
| 03/29/2001 | CA2321486A1 Hydraulic calibration of equivalent density |
| 03/28/2001 | EP1086292A1 A drilling tool |
| 03/27/2001 | US6206113 Non-cryogenic nitrogen for on-site downhole drilling and post drilling operations apparatus |
| 03/22/2001 | WO2001020124A1 Method and apparatus for through tubing gravel packing, cleaning and lifting |
| 03/22/2001 | WO2001020122A1 Absorbent materials and production thereof |
| 03/22/2001 | WO2001020121A1 Apparatus and method for the disposal of drilling solids during drilling of subsea oilfield wellbores |
| 03/22/2001 | WO2001020120A1 Method and system for storing gas for use in offshore drilling and production operations |
| 03/21/2001 | EP1084325A1 Arrangement for the removal of cuttings and gas arising from drilling operations |
| 03/20/2001 | US6202765 Device having a filter, a filter vibrating means and a scraper used for sucking off drillings |
| 03/20/2001 | US6202762 Flow restrictor valve for a downhole drilling assembly |
| 03/20/2001 | US6202752 Wellbore milling methods |
| 03/15/2001 | WO2001018352A1 Drilling waste handling |
| 03/15/2001 | WO2001017672A1 Apparatus including ultrasonic transducers for minimising the size of particles carried in a fluid medium |
| 03/15/2001 | WO2001017659A1 A screen assembly for a vibratory shaker |
| 03/15/2001 | CA2381296A1 A screen assembly for a vibratory shaker |
| 03/15/2001 | CA2282945A1 Apparatus for reducing a linear velocity of entrained particles in an air drilling return air stream |
| 03/14/2001 | EP1083296A1 Method for the removal and recovery of the oil component from drill cuttings |
| 03/14/2001 | EP1082517A1 Generating commands for a downhole tool |
| 03/14/2001 | EP1082515A1 Offshore drilling system |
| 03/07/2001 | EP1081330A2 Downhole mud diverter tools |
| 03/06/2001 | US6197078 Sleeve filter |
| 03/06/2001 | US6196337 Water pressure post-hole digger |
| 03/01/2001 | WO2001014690A1 A method for a valve, a valve and a wire line core drilling system including said valve |
| 03/01/2001 | WO2001014688A1 Method and system for processing of drilling fluid |
| 03/01/2001 | WO2001014685A1 Electrical surface activated downhole circulating sub |
| 03/01/2001 | WO2000075260A3 Method and apparatus for homogenizing drill fluid in an open-loop process |
| 03/01/2001 | WO2000054868A3 A method for the extraction of oil by microemulsification |
| 03/01/2001 | DE19925502C1 Verfahren zur Gewinnung von Öl aus Bohrschlamm und/oder ölhaltigen Bohrschlammfraktionen A process for the extraction of oil from drilling mud and / or oil-containing Bohrschlammfraktionen |
| 02/28/2001 | EP0897454B1 Closed loop fluid-handling system for use during drilling of wellbores |
| 02/22/2001 | WO2000019060A8 Tubular filling system |
| 02/21/2001 | CN2420640Y Coreing pressure detector |
| 02/20/2001 | US6189633 Drill |
| 02/20/2001 | US6189620 Method and apparatus for shutting off upward flow from a conduit |
| 02/20/2001 | US6189619 Sliding sleeve assembly for subsurface flow control |
| 02/20/2001 | US6189612 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 02/20/2001 | US6189383 Method and apparatus for acoustic logging of fluid density and wet cement plugs in boreholes |
| 02/14/2001 | EP1075582A2 Subsea mud pump |
| 02/14/2001 | CN1283785A Method for measuring vibration trace |
| 02/13/2001 | US6186237 Annulus check valve with tubing plug back-up |
| 02/06/2001 | US6182766 Drill string diverter apparatus and method |
| 02/06/2001 | US6182764 Generating commands for a downhole tool using a surface fluid loop |
| 02/01/2001 | WO2001007750A1 Method for injecting dense additive into drilling wells and composition therefore |
| 02/01/2001 | WO2001007748A2 Mechanism for dropping a plurality of balls into tubulars |
| 02/01/2001 | CA2380237A1 Method for injecting dense additive into drilling wells and composition therefor |
| 01/31/2001 | EP1071862A1 Rotating subsea diverter |
| 01/30/2001 | US6179071 Method and apparatus for handling and disposal of oil and gas well drill cuttings |
| 01/30/2001 | US6179070 Vacuum tank for use in handling oil and gas well cuttings |
| 01/30/2001 | US6179069 Breakout control to enhance wellbore stability |
| 01/30/2001 | US6179057 Apparatus and method for killing or suppressing a subsea well |
| 01/25/2001 | WO2001006086A1 Downhole bypass valve |
| 01/25/2001 | DE19933786A1 Measuring device comprises coil arranged on drill column for producing alternating field, sensor arranged on drill column for sensing alternating field, and computer to analyze signals from sensor |
| 01/24/2001 | EP1070195A1 A valve, a float shoe and a float collar for use in the construction of oil and gas wells |