| 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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| 02/28/2002 | CA2356493A1 Methods and apparatus for creating a downhole buoyant casing chamber |
| 02/27/2002 | EP1181432A1 Method of creating a wellbore |
| 02/27/2002 | CN1337986A Aphron-containing oil base fluids and method of drilling a well therewith |
| 02/27/2002 | CN1337985A Method of releasing stuck pipe or tools and spotting fluids therefor |
| 02/27/2002 | CN1079879C Drilling device, drilling system and drilling method |
| 02/27/2002 | CN1079877C Device for drilling bore hole in the ground |
| 02/26/2002 | US6350375 Arrangement in a separator |
| 02/26/2002 | US6349771 Flow actuated shut-off valve |
| 02/26/2002 | US6349763 Electrical surface activated downhole circulating sub |
| 02/26/2002 | CA2237093C Portable flare tank for degassing of drilling fluid |
| 02/21/2002 | WO2002014650A1 Activating ball assembly for use with a by-pass tool in a drill string |
| 02/21/2002 | WO2002014649A1 Underbalanced drilling tool and method |
| 02/21/2002 | WO2002014648A1 Combined drilling apparatus and method |
| 02/21/2002 | US20020020558 Deepwater drill string shut-off |
| 02/21/2002 | US20020020535 Reservoir communication with a wellbore |
| 02/21/2002 | US20020020532 Well starter device |
| 02/19/2002 | US6347675 Coiled tubing drilling with supercritical carbon dioxide |
| 02/19/2002 | US6347668 Relievable check valve assembly for oil wells and water wells |
| 02/14/2002 | US20020017387 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 02/14/2002 | US20020017386 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 02/14/2002 | US20020017193 Method and apparatus for removing gas from drilling mud |
| 02/14/2002 | DE10004217C2 Verfahren und Vorrichtung zum Hartgesteinsbohren mittels eines wasserbetreibbaren Motors Method and apparatus for hard rock drilling by means of a motor wasserbetreibbaren |
| 02/13/2002 | EP1179357A1 Screen assembly, vibratory separator and method of screening |
| 02/12/2002 | US6345672 Method and apparatus for handling and disposal of oil and gas well drill cuttings |
| 02/07/2002 | WO2002010552A1 Method and apparatus for shutting off upward flow from a conduit |
| 02/07/2002 | WO2002010546A2 Method and apparatus for formation damage removal |
| 02/07/2002 | US20020014353 Horizontal boring apparatus |
| 02/05/2002 | US6343658 Underbalanced well completion |
| 01/31/2002 | WO2002008568A1 Method and apparatus for degassing a drilling fluid |
| 01/31/2002 | WO2000053885A3 Downhole apparatus |
| 01/31/2002 | US20020013447 Emulsification; encapsulation |
| 01/31/2002 | US20020011357 Fluid drilling system with drill string and retro jets |
| 01/31/2002 | US20020011338 Multi-gradient drilling method and system |
| 01/31/2002 | US20020011333 Subsurface measurement apparatus, system, and process for improved well drilling, control, and production |
| 01/30/2002 | EP1175549A1 Rotating blowout preventer |
| 01/30/2002 | EP1175546A1 Abrasive jet drilling assembly |
| 01/24/2002 | WO2001065049A3 Cavitating jet |
| 01/24/2002 | US20020010548 Real-time method for maintaining formation stability and monitoring fluid-formation interaction |
| 01/24/2002 | US20020007968 Method and system for hydraulic friction controlled drilling and completing geopressured wells utilizing concentric drill strings |
| 01/23/2002 | CN1332309A Directly sucking and reversely circular bottom slag-removing method and equipment before filling concrete for drilling cast-in-situ pile |
| 01/17/2002 | WO2002004090A2 Continuous flow liquids/solids slurry cleaning, recycling and mixing system |
| 01/17/2002 | WO2002003983A1 Fatty acid analogues for the treatment of cancer |
| 01/17/2002 | US20020005299 Electrical surface activated downhole circulating sub |
| 01/17/2002 | CA2414480A1 Fatty acid analogues for the treatment of cancer |
| 01/16/2002 | EP0904481B1 Core machine |
| 01/16/2002 | CN2471927Y Oil production device for sand washover and without killing well |
| 01/09/2002 | EP1169540A1 Arrangement in rock drilling apparatus |
| 01/09/2002 | EP1169406A1 Method of releasing stuck pipe or tools and spotting fluids therefor |
| 01/08/2002 | US6337308 Polymer particles having clogging glob sizes, loops, drilling fluid systems, homogenizing and filtration |
| 01/03/2002 | WO2002000360A1 Apparatus and methods for making a screen and a screen made by the method |
| 01/03/2002 | US20020002205 Viscoelastic fluid comprising: an aqueous medium; a zwitterionic surfactant; and a member selected from the organic acid salts, inorganic acid salts |
| 01/03/2002 | US20020000399 Screen assemly for vibratory separators |
| 01/02/2002 | EP1167685A2 Method of removing drill cuttings from a deviated borehole |
| 01/02/2002 | EP1165935A1 Method and apparatus for cleaning boreholes |
| 01/02/2002 | EP1165199A2 A method for the extraction of oil by microemulsification |
| 01/02/2002 | CN2469170Y Tank for purifying and storage of mud |
| 01/01/2002 | US6334487 Valve assembly |
| 01/01/2002 | US6334486 Downhole flow control devices |
| 12/27/2001 | WO2001098626A1 System for creating a conduit in a borehole formed in an earth formation |
| 12/27/2001 | WO2001097947A1 A screen arrangement and a support structure for a vibratory separator |
| 12/27/2001 | WO2001067068A3 Apparatus and method for continuous measurement of drilling fluid properties |
| 12/27/2001 | WO2001033029A3 Sub sea bottom hole assembly change out system and method |
| 12/27/2001 | US20010054515 Downhole apparatus |
| 12/27/2001 | US20010054505 Downhole flow control devices |
| 12/27/2001 | US20010054504 Downhole flow control devices |
| 12/27/2001 | CA2412679A1 A screen arrangement and a support structure for a vibratory separator |
| 12/27/2001 | CA2411241A1 System for creating a conduit in a borehole formed in an earth formation |
| 12/25/2001 | US6332308 Air filtration device for use with roof drill |
| 12/25/2001 | CA2067071C Casing shut-in valve system |
| 12/19/2001 | EP1163037A1 Screen assembly, vibratory separator and method of screening |
| 12/19/2001 | EP0951519B1 Process for the facilitated waste disposal of working substances based on water-in-oil invert emulsions |
| 12/19/2001 | CN2466339Y Drilling fluid pretreating device |
| 12/13/2001 | WO2001094749A1 Real-time method for maintaining formation stability |
| 12/13/2001 | WO2001094740A1 Multi-gradient drilling method and system |
| 12/13/2001 | WO2001094739A1 Method for drilling and casing a wellbore with a pump down cement float |
| 12/13/2001 | US20010051593 Using amine surfactant |
| 12/13/2001 | US20010050186 Enhanced computer control of in-situ drilling system |
| 12/13/2001 | US20010050185 Apparatus and method for returning drilling fluid from a subsea wellbore |
| 12/13/2001 | CA2412417A1 Multi-gradient drilling method and system |
| 12/13/2001 | CA2412337A1 Real-time formation stability and drilling fluid formation interaction monitoring capability |
| 12/12/2001 | EP1161614A1 Downhole bypass valve |
| 12/12/2001 | EP1161511A1 Aphron-containing oil base fluids and method of drilling a well therewith |
| 12/12/2001 | EP0948577B1 Use of enhanced multicomponent mixtures for soil decomposition |
| 12/11/2001 | US6328118 Apparatus and methods of separation of materials in an under-balanced drilling operation |
| 12/11/2001 | US6328112 Valves for use in wells |
| 12/11/2001 | US6328107 Method for installing a well casing into a subsea well being drilled with a dual density drilling system |
| 12/11/2001 | US6328103 Methods and apparatus for downhole completion cleanup |
| 12/11/2001 | CA2266309C Recovery apparatus for drilling and excavating applications and related methods |
| 12/05/2001 | EP1159557A1 Swivel seal assembly |
| 12/05/2001 | EP1159510A2 Wellbore primary barrier and related systems |
| 12/05/2001 | EP1159509A1 Single valve for a casing filling and circulating apparatus |
| 12/04/2001 | US6325216 Screen apparatus for vibratory separator |
| 12/04/2001 | US6325159 Offshore drilling system |
| 12/04/2001 | US6325149 Reducing liquid spillage during hydrocarbon processing; pump liquid to preferential position in borehole, process liquid, recover hydrocarbon distillates |
| 12/04/2001 | US6325146 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 12/04/2001 | US6325145 Pressure pulse attenuator |
| 12/04/2001 | CA2009733C Device in impact machines |
| 11/29/2001 | WO2001090529A1 By-pass tool for use in a drill string |
| 11/29/2001 | WO2001090528A1 Method for controlled drilling and completing of wells |
| 11/29/2001 | US20010045288 Drop ball sub and system of use |