| 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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| 02/10/2004 | US6688394 Drilling methods and apparatus |
| 02/10/2004 | US6688389 Apparatus and method for locating joints in coiled tubing operations |
| 02/05/2004 | WO2004011769A1 Fast valve actuator and tool provided with same |
| 02/05/2004 | WO2004011767A1 Apparatus and method for transporting of drill cuttings |
| 02/05/2004 | WO2004011766A1 Drilling method |
| 02/05/2004 | US20040024063 Fatty acid analogues for the treatment of cancer |
| 02/05/2004 | US20040020655 Method and system for production of gas and water from a gas bearing strata during drilling and after drilling completion |
| 02/05/2004 | US20040020635 Apparatus and method for locating joints in coiled tubing operations |
| 02/04/2004 | CN2602154Y Frequency conversion double layer super G-force drilling fluid vibrating sieve |
| 02/03/2004 | US6684957 Float collar |
| 02/03/2004 | CA2068562C Cleaning methods |
| 01/29/2004 | WO2004009952A1 Reverse circulation clean out system for low pressure gas wells |
| 01/29/2004 | WO2004009951A1 System and method for developing and recycling drilling fluids |
| 01/29/2004 | US20040016572 System and method for developing and recycling drilling fluids |
| 01/28/2004 | EP1383983A1 Method of recycling water contaminated oil based drilling fluid |
| 01/28/2004 | CN2601299Y Multifunctional well operation tool |
| 01/28/2004 | CN2601298Y Deaerator for drilling liquid |
| 01/28/2004 | CN1471489A Device for transforting particles of magnetic material |
| 01/27/2004 | US6681874 Method and apparatus for removing fluids from drill cuttings |
| 01/22/2004 | WO2004007897A2 Shale hydration inhibition agent and method of use |
| 01/22/2004 | WO2004007895A2 Mud saver valve |
| 01/22/2004 | US20040011566 Activating ball assembly for use with a by-pass tool in a drill string |
| 01/22/2004 | US20040011561 Method and apparatus for inducing under balanced drilling conditions using an injection tool attached to a concentric string of casing |
| 01/22/2004 | US20040011531 Apparatus and method for facilitating the connection of tubulars using a top drive |
| 01/22/2004 | US20040011522 Device for perfoming hydrodynamic action on wellbore walls |
| 01/22/2004 | DE10325560A1 Erdbohrmaschine Earth drilling machine |
| 01/22/2004 | DE10225078B3 Verfahren und Vorrichtung zum Abtrennen von Feststoffen aus Flüssigkeiten Method and apparatus for separating solids from liquids |
| 01/20/2004 | CA2093726C Drilling muds effective at high temperature |
| 01/15/2004 | WO2004005673A1 Sand transport system |
| 01/15/2004 | WO2004005670A1 Closed loop multiphase underbalanced drilling process |
| 01/15/2004 | WO2004005667A1 Choke for controlling the flow of drilling mud |
| 01/15/2004 | US20040010453 Method and system for trade of goods, in particular electricity, water, fuel gas and the like |
| 01/15/2004 | US20040007392 Subsea mud pump and control system |
| 01/15/2004 | US20040007361 Bypass valve |
| 01/15/2004 | US20040007359 Snap-lock seal for seal valve assembly |
| 01/15/2004 | US20040007131 Closed loop multiphase underbalanced drilling process |
| 01/15/2004 | CA2491925A1 Choke for controlling the flow of drilling mud |
| 01/14/2004 | EP1380720A1 Downhole float apparatus |
| 01/13/2004 | US6675897 Downhole bypass valve |
| 01/13/2004 | US6675889 Tubular filling system |
| 01/08/2004 | WO2004003336A1 A valve for a fill up tool |
| 01/08/2004 | WO2004003101A1 System and method for removing particles from a well bore |
| 01/08/2004 | CA2485511A1 Systems and method for removing particles from a well bore penetrating a possible producing formation |
| 01/07/2004 | EP1377726A1 Method and apparatus for sawing or drilling concrete |
| 01/07/2004 | CN2597657Y Positive and negative circulation water tap for rotary drilling machine |
| 01/07/2004 | CN2597656Y High pressure drilling fluid filter |
| 01/07/2004 | CN1465844A Mud circulation system |
| 01/06/2004 | US6672565 Dual snap action for valves |
| 01/02/2004 | EP1375817A1 Underbalance drilling downhole choke |
| 01/02/2004 | EP1373675A1 Method for drilling and drilling apparatus |
| 01/02/2004 | EP0907820B1 Drill tube for forming drill strings |
| 01/01/2004 | US20040000762 Equalizer valve |
| 01/01/2004 | US20040000434 System and method for removing particles from a well bore penetrating a possible producing formation |
| 01/01/2004 | US20040000406 Downhole surge reduction method and apparatus |
| 01/01/2004 | US20040000405 Valve for an internal fill up tool |
| 01/01/2004 | US20040000404 Production tubing joint |
| 12/31/2003 | WO2003063998A9 Cleaning of hydrocarbon-containing materials with critical and supercritical solvents |
| 12/31/2003 | CN2595990Y Splashing prevention device for drilling fluid vibrating screen |
| 12/30/2003 | USRE38367 Recovery apparatus for drilling and excavation application and related methods |
| 12/30/2003 | US6668947 Drill cutting treatment method |
| 12/30/2003 | US6668943 Method and apparatus for controlling pressure and detecting well control problems during drilling of an offshore well using a gas-lifted riser |
| 12/30/2003 | US6668937 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 12/30/2003 | US6668684 Tong for wellbore operations |
| 12/25/2003 | US20030235691 Polycrystalline diamond partially depleted of catalyzing material |
| 12/25/2003 | US20030234120 Drilling formation tester, apparatus and methods of testing and monitoring status of tester |
| 12/25/2003 | US20030234101 Drilling method |
| 12/24/2003 | WO2003018951A3 Washpipe assembly |
| 12/23/2003 | US6666287 Method and apparatus for enclosing an oil drilling rig |
| 12/23/2003 | US6666273 Valve assembly for use in a wellbore |
| 12/18/2003 | WO2003104607A1 Apparatus and method for cleaning drill cuttings |
| 12/18/2003 | US20030230893 Spoolable composite coiled tubing connector |
| 12/18/2003 | US20030230432 Apparatus and process for drilling casing with environmentally contained mud annulus |
| 12/16/2003 | US6665636 Simulating the control of solids in drilling fluids, and application to determining the size of cuttings |
| 12/16/2003 | US6662886 Mudsaver valve with dual snap action |
| 12/16/2003 | US6662884 Method for determining sweep efficiency for removing cuttings from a borehole |
| 12/11/2003 | WO2003102367A1 Method and apparatus to reduce downhole surge pressure using hydrostatic valve |
| 12/11/2003 | WO2003102359A1 Centrifugal drill cuttings drying apparatus. |
| 12/11/2003 | WO2003102348A2 Multi seam coal bed/methane dewatering and depressurizing production system |
| 12/11/2003 | US20030226691 Ground drilling machine |
| 12/11/2003 | US20030226689 Method for varying the density of drilling fluids in deep water oil and gas drilling applications |
| 12/10/2003 | EP1368552A1 Downhole tool |
| 12/10/2003 | EP1220972B1 Underbalanced perforation |
| 12/10/2003 | EP1144540B1 Removal of h2s from drilling muds |
| 12/09/2003 | US6658757 Method and apparatus for separating hydrocarbons from material |
| 12/09/2003 | CA2207648C Method and apparatus for drilling with high-pressure, reduced solid content liquid |
| 12/04/2003 | WO2003100209A1 Dynamic mudcap drilling and well control system |
| 12/04/2003 | WO2003100208A1 Apparatus and method to reduce fluid pressure in a wellbore |
| 12/04/2003 | US20030221837 Method and apparatus to reduce downhole surge pressure using hydrostatic valve |
| 12/04/2003 | US20030221836 Multi seam coal bed/methane dewatering and depressurizing production system |
| 12/04/2003 | US20030221519 Methods and apparatus for connecting tubulars while drilling |
| 12/04/2003 | US20030221331 Centrifugal drill cuttings drying apparatus |
| 12/02/2003 | US6655475 Product and method for treating well bores |
| 11/27/2003 | WO2003097988A2 Equalizer valve and method of use |
| 11/27/2003 | WO2003071087A8 Pantograph underreamer |
| 11/27/2003 | US20030217866 System and method for treating drilling mud in oil and gas well drilling applications |
| 11/27/2003 | US20030217849 Dynamic mudcap drilling and well control system |
| 11/27/2003 | US20030217843 Tubular filling system |
| 11/25/2003 | US6651748 Methods and apparatus for creating a downhole buoyant casing chamber |
| 11/25/2003 | CA2225207C Single trip whipstock assembly |
| 11/20/2003 | WO2003095790A1 Valve assembly with locking sleeve for use in a wellbore |