| 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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| 06/02/2004 | EP1424380A1 Compositions for drilling fluids useful to provide flat temperature rheology to such fluids over a wide temperature range and drilling fluids containing such compositions |
| 06/02/2004 | EP1423582A1 Assembly for drilling low pressure formation |
| 06/02/2004 | EP1140379B1 Screen assembly for use in a vibratory shaker |
| 06/01/2004 | US6742597 Safety check valve for coiled tubing |
| 05/27/2004 | WO2004044366A2 Method and apparatus for varying the density of drilling fluids in deep water oil drilling applications |
| 05/27/2004 | WO2004033845A3 Dual-gradient drilling using nitrogen injection |
| 05/27/2004 | WO2003097988A3 Equalizer valve and method of use |
| 05/27/2004 | US20040102332 Reaction product of dimer fatty acid and ethylene polyamine derivative with alkoxylated alkyl amines and/or fatty acid amides; reduced organoclay content; oil wells |
| 05/27/2004 | US20040100858 Fluid mixing system |
| 05/27/2004 | US20040099578 Screen assembly for vibratory separators |
| 05/27/2004 | US20040099447 Downhole circulation valve operated by dropping balls |
| 05/27/2004 | US20040099446 Membrane forming in-situ polymerization for water based drilling fluid |
| 05/27/2004 | US20040099418 Reservoir communication by creating a local underbalance and using treatment fluid |
| 05/27/2004 | US20040099413 Wellbore cleanout tool and method |
| 05/26/2004 | EP1421253A1 System for controlling the operating pressures within a subterranean borehole |
| 05/26/2004 | EP1421252A2 Washpipe assembly |
| 05/26/2004 | CN1500175A Method for drilling and drilling appts. |
| 05/25/2004 | US6739414 Compositions and methods for sealing formations |
| 05/25/2004 | US6739408 Apparatus and method for preparing variable density drilling muds |
| 05/25/2004 | US6739397 Continuous circulation drilling method |
| 05/25/2004 | US6739214 Polycrystalline diamond partially depleted of catalyzing material |
| 05/22/2004 | WO2004048746A1 Fluid collecting device |
| 05/21/2004 | WO2004041400A2 Method and apparatus for treating a contaminated fluid |
| 05/21/2004 | CA2498964A1 Method and apparatus for treating a contaminated fluid |
| 05/20/2004 | US20040096276 Portable environmental containment system |
| 05/20/2004 | US20040094483 Apparatus for recycling of oil based drilling fluid contaminated with water and water contaminated with oil based drilling fluid |
| 05/20/2004 | US20040094331 Method for drilling and completing boreholes with electro-rheological fluids |
| 05/19/2004 | EP1082517B1 Generating commands for a downhole tool |
| 05/19/2004 | CN2616677Y Jet-flow flushing device |
| 05/18/2004 | US6736226 Method and apparatus for boring through a solid material |
| 05/18/2004 | US6736207 Internal blow-out preventer change-out tool |
| 05/18/2004 | CA2294483C A method of injecting drilling waste into a well while drilling |
| 05/13/2004 | WO2004040093A2 Drilling mud filtration device |
| 05/13/2004 | US20040089591 Process for the separation of hollow glass microspheres from muds containing them |
| 05/13/2004 | US20040089449 Controlling a pressure transient in a well |
| 05/13/2004 | US20040089321 Depressurization and cooling of extracting fluid; heat exchanging |
| 05/13/2004 | CA2503565A1 Drilling mud filtration device |
| 05/12/2004 | EP1417993A1 A screen arrangement for a vibratory separator, a screen assembly and a vibratory separator |
| 05/12/2004 | EP1214497B1 Absorbent materials and production thereof |
| 05/12/2004 | EP1141514B1 Pipe assembly with a plurality of outlets for use in a wellbore and method for running such a pipe assembly |
| 05/12/2004 | CN2615643Y Mud displacement measuring apparatus |
| 05/11/2004 | US6732820 Method and apparatus for boring through a solid material |
| 05/11/2004 | US6732819 Mudsaver valve with retrievable inner sleeve |
| 05/11/2004 | US6732804 Dynamic mudcap drilling and well control system |
| 05/11/2004 | US6732798 Controlling transient underbalance in a wellbore |
| 05/11/2004 | US6732793 Downhole jetting tool |
| 05/11/2004 | CA2359846C Aphron-containing oil base fluids and method of drilling a well therewith |
| 05/06/2004 | WO2004038172A1 Cement flow control tool |
| 05/06/2004 | WO2004038170A1 Multi-cycle downhole apparatus |
| 05/06/2004 | WO2004031529A3 Cementing through a side pocket mandrel |
| 05/06/2004 | US20040087448 Packer fluid |
| 05/06/2004 | US20040084214 System for drilling oil and gas wells using a concentric drill string to deliver a dual density mud |
| 05/06/2004 | US20040084213 System for drilling oil and gas wells using oversized drill string to achieve increased annular return velocities |
| 05/06/2004 | US20040084189 Instrumentation for a downhole deployment valve |
| 05/06/2004 | US20040084182 Reverse cementing float shoe |
| 05/06/2004 | EP1414753A2 Method for regeneration of used halide fluids |
| 05/06/2004 | EP1181432B1 Method of creating a wellbore |
| 05/05/2004 | CN2614260Y Underbalance drilling fluid choke manifold automatic alarm device |
| 05/04/2004 | US6730234 Method for regeneration of used halide fluids |
| 05/04/2004 | US6730146 Drilling fluid degasser |
| 05/04/2004 | US6729398 Methods of downhole testing subterranean formations and associated apparatus therefor |
| 05/04/2004 | US6729393 Zero drill completion and production system |
| 04/29/2004 | WO2004035984A1 Drill head steering |
| 04/29/2004 | US20040082484 Aqueous thickener containing amphoteric surfactants and/or zwitterionic surfactants and organic acids or salts and/or inorganic salts |
| 04/29/2004 | US20040079553 Reverse circulation directional and horizontal drilling using concentric drill string |
| 04/29/2004 | US20040079551 Drilling mud filtration device |
| 04/29/2004 | US20040079531 Disconnect check valve mechanism for coiled tubing |
| 04/28/2004 | EP1412609A1 Internal blow-out preventer change-out tool |
| 04/28/2004 | EP1246681B1 A method of making a screen, a screen, and a system for making a screen |
| 04/28/2004 | EP0988438B1 Extension drilling system |
| 04/28/2004 | CA2446984A1 Internal riser rotating control head |
| 04/27/2004 | US6725949 Washpipe assembly |
| 04/27/2004 | US6725938 Apparatus and method for facilitating the connection of tubulars using a top drive |
| 04/27/2004 | US6725937 Downhole apparatus |
| 04/27/2004 | US6725935 PDF valve |
| 04/27/2004 | CA2054919C Drill string component |
| 04/22/2004 | WO2004033855A2 Well control using pressure while drilling measurements |
| 04/22/2004 | WO2004033845A2 Dual-gradient drilling using nitrogen injection |
| 04/22/2004 | WO2004033842A2 Method and apparatus for removing cuttings from a deviated wellbore |
| 04/22/2004 | WO2003097988A9 Equalizer valve and method of use |
| 04/22/2004 | WO2003025334A8 System for controlling the discharge of drilling fluid |
| 04/22/2004 | WO2003016671A3 High power umbilicals for subterranean electric drilling machines and remotely operated vehicles |
| 04/20/2004 | US6722504 Vibratory separators and screens |
| 04/20/2004 | US6722452 Pantograph underreamer |
| 04/20/2004 | US6722438 Method and apparatus for formation damage removal |
| 04/20/2004 | US6722425 Tubular filling system |
| 04/15/2004 | WO2004031533A2 Downhole ball dropping apparatus |
| 04/15/2004 | WO2004031532A1 Mono-trip well completion |
| 04/15/2004 | WO2004031529A2 Cementing through a side pocket mandrel |
| 04/15/2004 | US20040072696 Invert emulsion fluids having negative alkalinity |
| 04/15/2004 | US20040069536 Apparatus and method for minimizing solids deposited in a reserve pit |
| 04/15/2004 | US20040069533 Pneumatic rock-boring device and method for starting such a device |
| 04/15/2004 | US20040069504 Downhole activatable annular seal assembly |
| 04/15/2004 | US20040069501 Apparatus and methods for drilling with casing |
| 04/15/2004 | US20040069496 Wellbore isolation apparatus, and method for tripping pipe during underbalanced drilling |
| 04/14/2004 | EP1153197B1 Method and apparatus for cleaning drill cuttings |
| 04/14/2004 | EP1086292B1 A drilling tool |
| 04/14/2004 | EP1038086B1 Percussive tool |
| 04/14/2004 | EP0995009B1 Device and method for measuring the flow rate of drill cuttings |
| 04/14/2004 | CN2611578Y Drilling slurry inducer |