| 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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| 07/28/2009 | CA2432119C Drilling system and method |
| 07/28/2009 | CA2392481C A method and system for making a screen for use in shale shakers |
| 07/23/2009 | WO2009090364A1 Apparatus and method for processing solids laden fluid in the drilling and maintenance of oil and gas wells |
| 07/23/2009 | US20090184055 Method for recycling of oil based drilling fluid contaminated with water and water contaminated with oil based drilling fluid |
| 07/23/2009 | US20090183922 Method of removing dissolved iron in aqueous systems |
| 07/23/2009 | CA2706006A1 Apparatus and method for processing solids laden fluid in the drilling and maintenance of oil and gas wells |
| 07/22/2009 | EP1442280B1 Module for extracting gas from underground liquid and installation equipped therewith |
| 07/21/2009 | US7562723 Method for determining formation fluid entry into or drilling fluid loss from a borehole using a dynamic annular pressure control system |
| 07/21/2009 | US7562465 Process and means for drying of sticky materials |
| 07/21/2009 | CA2497027C Apparatus and methods for utilizing a downhole deployment valve |
| 07/17/2009 | CA2780351A1 Flow operated orienter |
| 07/16/2009 | WO2009088825A2 Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion |
| 07/16/2009 | WO2009088301A1 A method for control of a drilling operation |
| 07/16/2009 | CA2711238A1 Slim-hole parasite string |
| 07/15/2009 | EP2078131A1 Air actuated down- the -hole hammer and drill bit and foot valve for use in the hammer |
| 07/15/2009 | CN201273160Y Monitoring apparatus of slurry pump group |
| 07/15/2009 | CN100513736C Underground liquid level monitoring system and its method |
| 07/15/2009 | CN100513734C Method and system of injecting a fluid into a borehole ahead of the bit |
| 07/14/2009 | US7560418 Additives for imparting fragile progressive gel structure and controlled temporary viscosity to oil based drilling fluids |
| 07/14/2009 | CA2429292C Fluid mixing system |
| 07/09/2009 | WO2009085496A1 Method for detecting formation pressure |
| 07/09/2009 | WO2009067588A3 Wired multi-opening circulating sub |
| 07/09/2009 | WO2009065523A3 Self-circulating drill bit |
| 07/09/2009 | US20090173501 Borehole Cleaning Using Downhole Pumps |
| 07/09/2009 | CA2711192A1 Method and apparatus for programmable pressure drilling and programmable gradient drilling, and completion |
| 07/08/2009 | CN101476450A Tool for improving gas drilling ring empty flow field |
| 07/07/2009 | US7556154 Drill fluid screening device |
| 07/07/2009 | US7556106 Drilling fluid monitor |
| 07/07/2009 | CA2489063C Filtered actuator port for hydraulically actuated downhole tools |
| 07/07/2009 | CA2483527C Instrumentation for a downhole deployment valve |
| 07/01/2009 | EP2074276A1 Wellbore tool for filling, circulating and backflowing fluids |
| 07/01/2009 | CN201265380Y Current divider for ocean oil drilling |
| 07/01/2009 | CN201265379Y Blowdown recovery apparatus for well drilling |
| 07/01/2009 | CN201265378Y Water atomization and oil atomization integrated system of high-frequency drill rig |
| 07/01/2009 | CN201265377Y Fast dust laying apparatus in hole |
| 07/01/2009 | CN100507208C Well control using pressure while drilling measurements |
| 06/30/2009 | US7552687 Offshore cargo rack for use in transferring palletized loads between a marine vessel and an offshore platform |
| 06/30/2009 | CA2563092C Flow switchable check valve |
| 06/30/2009 | CA2544314C Drill cutting sampler |
| 06/30/2009 | CA2519546C Vibratory screening machine for earth drilling installation |
| 06/25/2009 | WO2009079575A2 Optimizing drilling performance using a selected drilling fluid |
| 06/25/2009 | WO2009078731A2 A collecting device and a method of using same |
| 06/25/2009 | WO2009077656A1 Rock drilling rig and method for drilling |
| 06/25/2009 | US20090159266 Actuating mechanism |
| 06/25/2009 | CA2709124A1 A collecting device and a method of using same |
| 06/24/2009 | CN101463714A Foam cyclic utilization method used for under balance drilling |
| 06/24/2009 | CN101463713A Drilling fluid circulating and separating method for sulfur-containing stratum under-balance drilling operation |
| 06/23/2009 | US7550411 Subterranean treatment fluids comprising polyoxazoline compositions and methods of use in subterranean formations |
| 06/23/2009 | US7549477 System and method for unloading water from gas wells |
| 06/23/2009 | CA2448617C Borehole fluid |
| 06/23/2009 | CA2360234C Method and apparatus for enclosing an oil drilling rig |
| 06/18/2009 | WO2009074818A1 A method and apparatus for processing solids laden drilling mud having lost circulation material therein |
| 06/18/2009 | WO2009074815A2 Waste solid cleaning apparatus |
| 06/18/2009 | WO2009074632A2 Wellbore system |
| 06/18/2009 | WO2009058706A3 Anchored riserless mud return systems |
| 06/18/2009 | US20090152007 Optimizing drilling performance using a selected drilling fluid |
| 06/18/2009 | US20090152006 Dual stripper rubber cartridge with leak detection |
| 06/18/2009 | CA2709098A1 Waste solid cleaning apparatus |
| 06/18/2009 | CA2708294A1 A method and apparatus for processing solids laden drilling mud having lost circulation material therein |
| 06/18/2009 | CA2705237A1 Wellbore system |
| 06/17/2009 | EP2069086A2 Injection molded grid for saving screen frames |
| 06/17/2009 | CN201258707Y Pulling type quick moving mud purifying device |
| 06/17/2009 | CN201258706Y Folding leg for hoisting medicament |
| 06/16/2009 | US7547663 Invert drilling fluids and methods of drilling boreholes |
| 06/16/2009 | US7546879 Flow control device |
| 06/16/2009 | US7546878 Chemical deployment canisters for downhole use |
| 06/16/2009 | US7546874 Conserving components of fluids |
| 06/11/2009 | WO2009073438A2 Breaker fluids and methods of using the same |
| 06/11/2009 | WO2009070876A1 Mud pump |
| 06/11/2009 | US20090145660 Method and system for fracturing subsurface formations during the drilling thereof |
| 06/11/2009 | US20090145608 Apparatus and method for deliquifying a well |
| 06/11/2009 | CA2707263A1 Breaker fluids and methods of using the same |
| 06/10/2009 | CN201254965Y Water guide chamber structure for double-liquid light-duty drill |
| 06/10/2009 | CN101454535A Integrated pump assembly for well completion |
| 06/10/2009 | CN100497881C Injection system for eliminating sucking pressure as coming out of hole |
| 06/09/2009 | US7544642 Zeolite-containing remedial compositions |
| 06/09/2009 | US7544639 Microemulsification of a solvent-surfactant blend of terpenes or limonene and polyoxyethylene sorbitan monopalmitate, ethoxylated castor oil and polyethylene glycol with a carrier fluid; injection into a well bore or placing in a container to capture the H2S; pollution control; well remediation |
| 06/09/2009 | CA2351832C Transport device for analysing hydrocarbon constituents |
| 06/04/2009 | WO2009070519A2 Pressure compensation and rotary seal system for measurement while drilling instrument |
| 06/04/2009 | WO2009067786A1 Determination of formation pressure during a drilling operation |
| 06/04/2009 | WO2008155654A3 Hydrocarbon recovery drill string apparatus, subterranean hydrocarbon recovery drilling methods, and subterranean hydrocarbon recovery methods |
| 06/04/2009 | WO2008041018A3 Apparatus and method for separating solids from solids laden drilling mud |
| 06/04/2009 | US20090139770 Cuttings treatment and reuse |
| 06/04/2009 | US20090139713 Method and apparatus for detecting while drilling underbalanced the presence and depth of water produced from the formation |
| 06/04/2009 | CA2707128A1 Drilling fluids containing microbubbles |
| 06/03/2009 | EP2065559A2 Self-boring compound anchoring element |
| 06/03/2009 | EP2064002A2 Apparatus and method for separating solids from solids laden drilling mud |
| 06/03/2009 | EP1337306B1 A screen assembly for a vibratory separator |
| 06/03/2009 | CN201250625Y Oil drilling slurry monitoring system |
| 06/03/2009 | CN201250624Y Solid phase separating device of four-phase separator for drilling fluid |
| 06/03/2009 | CN100494623C Low-pressure drilling technology using double-wall drill pipe |
| 06/02/2009 | US7541317 Downhole drilling compositions and methods of preparation |
| 06/02/2009 | CA2555646C Apparatus for changing wellbore fluid temperature |
| 06/02/2009 | CA2440922C Downhole tool |
| 06/02/2009 | CA2332241C Wireless coiled tubing joint locator |
| 05/28/2009 | WO2009067588A2 Wired multi-opening circulating sub |
| 05/28/2009 | WO2009065858A1 Wellbore fluid mixing system |
| 05/28/2009 | WO2009065581A1 Flow diverter for drilling |
| 05/28/2009 | WO2009065523A2 Self-circulating drill bit |
| 05/28/2009 | US20090133930 Pressure compensation and rotary seal system for measurement while drilling instrumentation |