| 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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| 01/24/2001 | EP1070194A1 A mill and a method for milling |
| 01/24/2001 | EP0956424B1 Method and device for driving bore holes, specially exploring and extraction drillings in the sea bottom |
| 01/23/2001 | US6177014 Separation particles, wastes from solvent |
| 01/23/2001 | US6176327 Method and toolstring for operating a downhole motor |
| 01/23/2001 | US6176323 Drilling systems with sensors for determining properties of drilling fluid downhole |
| 01/23/2001 | US6176313 Method and tool for fracturing an underground formation |
| 01/23/2001 | US6176311 Downhole cutting separator |
| 01/23/2001 | CA2124676C Mud check valves in drilling apparatus (wells) |
| 01/23/2001 | CA2123298C Trenchless pipeline replacement |
| 01/19/2001 | CA2277657A1 Apparatus and method for treating drill cuttings |
| 01/18/2001 | WO2001004457A1 Downhole jetting tool |
| 01/18/2001 | WO2001004456A1 Lubricator for underbalanced drilling |
| 01/18/2001 | DE10029476A1 Horizontal, subterranean, trenchless drilling head unit |
| 01/18/2001 | CA2615015A1 Expansion cone for radially expanding a tubular member |
| 01/18/2001 | CA2378670A1 Downhole jetting tool |
| 01/17/2001 | EP1068425A1 Drillstring with stabilisers for re-entering a primary wellbore |
| 01/16/2001 | US6173795 Multi-cycle circulating sub |
| 01/16/2001 | US6173777 Single valve for a casing filling and circulating apparatus |
| 01/11/2001 | WO2001002832A1 Modelling the rheological behaviour of drilling fluids as a function of pressure and temperature |
| 01/11/2001 | WO2001002697A1 Apparatus and method for controlling fluid flow |
| 01/10/2001 | CN2414187Y Screwing adjustable piston for mud pump |
| 01/09/2001 | US6170667 Apparatus and method for preparation of liquid/solid slurries |
| 01/09/2001 | US6170580 Method and apparatus for collecting, defluidizing and disposing of oil and gas well drill cuttings |
| 01/04/2001 | WO2000053887A3 Wellbore primary barrier and related systems |
| 01/03/2001 | EP1064451A1 Pressure actuated downhole tool |
| 01/02/2001 | US6167974 Method of underbalanced drilling |
| 01/02/2001 | US6167969 Remote control valve |
| 01/02/2001 | CA2188839C Recovery of gas from drilling fluid returns in underbalanced drilling |
| 12/28/2000 | WO2000079092A2 Drilling system |
| 12/27/2000 | EP0991847A4 Downhole surge pressure reduction system and method of use |
| 12/27/2000 | EP0752047B1 Fill valve |
| 12/27/2000 | CN2412087Y Slurry medium middle-short range reciprocating movement device |
| 12/26/2000 | US6165946 Circulating a frictionally heated working fluid in contact with solid surface during geologic exploration, cooling fluid to a temperature above the freezing point of the aqueous phase and below phase inversion temperature |
| 12/21/2000 | WO2000077339A1 Method and apparatus for displacing drilling fluids with completion and workover fluids, and for cleaning tubular members |
| 12/20/2000 | EP1060323A1 Mud circulation for lithosphere drilling |
| 12/20/2000 | EP1060320A1 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 12/20/2000 | EP0880411B1 Screen for vibrating separator |
| 12/20/2000 | EP0777813A4 Formation isolation and testing apparatus and method |
| 12/19/2000 | US6162284 Separator for gases, liquids and solids from a well |
| 12/19/2000 | US6161635 Drilling system drive steel |
| 12/19/2000 | US6161633 Apparatus for boring through a solid material |
| 12/19/2000 | US6161632 Purging means for purging upwards in ring spacing between drill pipe and bore hole wall |
| 12/14/2000 | WO2000075482A1 Sliding sleeve assembly for subsurface flow control |
| 12/14/2000 | WO2000075481A1 Shear-sensitive plugging fluid for plugging and a method for plugging a subterranean formation zone |
| 12/14/2000 | WO2000075477A1 Controlling pressure and detecting control problems in gas-lift riser during offshore well drilling |
| 12/14/2000 | WO2000075476A1 Method of creating a wellbore |
| 12/14/2000 | WO2000075261A1 Method for extracting oil from drilling mud and/or drilling mud fractions containing oil |
| 12/14/2000 | WO2000075260A2 Method and apparatus for homogenizing drill fluid in an open-loop process |
| 12/14/2000 | CA2371429A1 Sliding sleeve assembly for subsurface flow control |
| 12/14/2000 | CA2371425A1 Controlling pressure and detecting control problems in gas-lift riser during offshore well drilling |
| 12/13/2000 | CN2410413Y Continuous sand-washing device for oil field |
| 12/12/2000 | US6160036 Microencapsulated drag reducing agents |
| 12/12/2000 | US6158516 Combined drilling apparatus and method |
| 12/06/2000 | EP1057543A1 Process and paste for making a mantel-like removable protection coating |
| 12/06/2000 | CN2409333Y Pump pressure changer |
| 12/05/2000 | US6156708 Mixture of oleaginous liquid and viscosifier |
| 12/05/2000 | US6155964 Centrifuge drive system providing optimum performance |
| 12/05/2000 | US6155349 Flexible wellbore mill |
| 11/30/2000 | WO2000071919A1 Fluid flow and pressure control system and method |
| 11/30/2000 | WO2000043634A3 Method and apparatus for formation isolation in a well |
| 11/29/2000 | EP1055797A2 Drill string diverter apparatus and method |
| 11/28/2000 | US6152307 Vibratory separator screens |
| 11/28/2000 | US6152232 Underbalanced well completion |
| 11/23/2000 | WO2000047861A3 Hydraulic underreamer and sections for use therein |
| 11/23/2000 | WO2000029710A3 Wellbore flow control device |
| 11/22/2000 | EP1054135A1 Method and apparatus for handling and disposal of oil and gas well drill cuttings |
| 11/22/2000 | EP1053384A1 Cleaning of drill cuttings and apparatus therfor |
| 11/22/2000 | EP0960254A4 Reverse circulation drilling system with bit locked underreamer arms |
| 11/22/2000 | CN2407333Y Layered water filling apparatus |
| 11/21/2000 | US6148934 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device |
| 11/21/2000 | US6148917 Method of releasing stuck pipe or tools and spotting fluids therefor |
| 11/21/2000 | US6148915 Apparatus and methods for completing a subterranean well |
| 11/21/2000 | US6148912 Subsurface measurement apparatus, system, and process for improved well drilling control and production |
| 11/14/2000 | US6145604 Core Machine |
| 11/14/2000 | US6145603 Extension drilling system |
| 11/14/2000 | US6145600 Portable apparatus for soil sampling |
| 11/09/2000 | WO2000066879A1 Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 11/09/2000 | WO2000066872A1 Abrasive jet drilling assembly |
| 11/08/2000 | EP1050661A2 Improvements relating to subsea drilling of boreholes |
| 11/07/2000 | US6142236 Method for drilling and completing a subsea well using small diameter riser |
| 11/07/2000 | US6142226 Hydraulic setting tool |
| 11/02/2000 | WO2000064558A1 Screen assembly, vibratory separator and method of screening |
| 11/02/2000 | WO2000041487A3 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 11/02/2000 | EP1048819A1 Closed loop fluid-handling system for use during drilling of wellbores |
| 10/31/2000 | US6138834 Recovery apparatus for drilling and excavation application and related methods |
| 10/31/2000 | US6138777 Hydraulic underreamer and sections for use therein |
| 10/31/2000 | US6138774 Method and apparatus for drilling a borehole into a subsea abnormal pore pressure environment |
| 10/31/2000 | US6138757 Apparatus and method for downhole fluid phase separation |
| 10/31/2000 | US6138750 Water well stagnant bottom rehabilitation means and method |
| 10/25/2000 | CN2403001Y Float pressure flowmeter |
| 10/24/2000 | US6135373 Rotary grinder |
| 10/19/2000 | WO2000061907A1 Arrangement in rock drilling apparatus |
| 10/17/2000 | US6133205 Adding to and mixing with hydrocarbon flowback fluid alkaline aqueous additive solution |
| 10/17/2000 | US6132617 Method of producing milling adjuvants and/or dispersive agents, by physicochemical separation; adjuvants and agents thus obtained; and uses of the same |
| 10/17/2000 | CA2272773C Method of drilling boreholes in areas with restricted access |
| 10/11/2000 | EP1043476A2 Device for pumping slurry |
| 10/11/2000 | EP1042585A1 Method and apparatus for cementing casing in a wellbore |
| 10/10/2000 | US6129160 Torque compensation apparatus for bottomhole assembly |
| 10/10/2000 | US6129152 Rotating bop and method |
| 10/08/2000 | CA2304430A1 Device for pumping slurry |