| 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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| 04/14/2004 | CN2611577Y Sand removing slurry cylinder |
| 04/14/2004 | CN2611576Y Connection structure of drilling liquid circulating cylinder |
| 04/13/2004 | US6719071 Apparatus and methods for drilling |
| 04/13/2004 | US6719055 Method for drilling and completing boreholes with electro-rheological fluids |
| 04/08/2004 | WO2004029404A1 System to reduce hydrostatic pressure in risers using buoyant spheres |
| 04/08/2004 | WO2004028663A1 Advanced ultrasonic processor |
| 04/08/2004 | WO2004003336B1 A valve for a fill up tool |
| 04/08/2004 | US20040065477 Well control using pressure while drilling measurements |
| 04/08/2004 | US20040065440 Dual-gradient drilling using nitrogen injection |
| 04/08/2004 | US20040065353 Using extraction fluids under critical temperature, pressure; cleaning hydrocarbons; removal solids form drilling fluids |
| 04/08/2004 | US20040064969 Apparatus and method for separating hydrocarbons from material |
| 04/07/2004 | CN2610059Y Water-surge apparatus |
| 04/06/2004 | US6716797 Polymer and surfactant |
| 04/06/2004 | US6715611 Vibratory separator |
| 04/06/2004 | US6715610 Slurry treatment |
| 04/06/2004 | US6715570 Two stage downhole drilling fluid filter |
| 04/06/2004 | US6715557 Tool string |
| 04/06/2004 | US6715542 Tubular filling system |
| 04/01/2004 | WO2004027208A1 Continuous system for the sampling and degassing of a drilling mud |
| 04/01/2004 | WO2004026987A1 Membrane forming in-situ polymerization for water based drilling fluids |
| 04/01/2004 | WO2003029600A3 Cementing system for wellbores |
| 04/01/2004 | US20040060740 Pneumatic rock-boring device and method for horizontal drilling using compressed air and drilling medium |
| 04/01/2004 | US20040060738 Method for determining sweep efficiency for removing cuttings from a borehole |
| 04/01/2004 | US20040060737 System for drilling oil and gas wells by varying the density of drilling fluids to achieve near-balanced, underbalanced, or overbalanced drilling conditions |
| 04/01/2004 | US20040060700 Method for drilling and casing a wellbore with a pump down cement float |
| 03/31/2004 | EP1402222A1 Process and means for drying of sticky materials |
| 03/31/2004 | EP1402147A1 Multi-cycle downhole apparatus |
| 03/31/2004 | EP1401550A1 Process and arrangement for separating oil from oil containing materials |
| 03/31/2004 | CN1143718C Improved helical separator |
| 03/30/2004 | US6712145 Float collar |
| 03/30/2004 | US6711830 Transport system comprising a variable speed auger within a housing defining an outlet port; dryer; injecting a non-toxic additive; drilling |
| 03/30/2004 | CA2229105C Tool deployment apparatus and method |
| 03/30/2004 | CA2149230C Anti-rotation devices for use with well tools |
| 03/25/2004 | WO2004025072A1 Method and system for controlling pressure in a dual well system |
| 03/25/2004 | WO2004025071A1 Automated pipe joining system |
| 03/25/2004 | WO2003016670A3 Swing mounted fill up and circulating tool |
| 03/25/2004 | US20040055945 Integrated debris management system |
| 03/25/2004 | US20040055753 Downhole ball dropping apparatus |
| 03/24/2004 | EP1399524A1 Shale hydration inhibition agent and method of use |
| 03/24/2004 | CN1484730A 流体混合系统 Fluid mixing system |
| 03/23/2004 | US6708784 Core barrel valve assembly |
| 03/18/2004 | WO2004022907A1 Ball operated by-pass tool for use in drillstring |
| 03/18/2004 | WO2004022906A1 Dart-operated big bore by-pass valve |
| 03/18/2004 | WO2004022905A1 Method, apparatus and system for pore pressure prediction in presence of dipping formations |
| 03/18/2004 | WO2004022903A2 Top drive swivel apparatus and method |
| 03/18/2004 | US20040050591 Two stage downhole drilling fluid filter |
| 03/18/2004 | US20040050550 Re-use recovered treating fluid |
| 03/18/2004 | US20040049905 Automated pipe joining system |
| 03/18/2004 | CA2482457A1 Method, apparatus and system for pore pressure prediction in presence of dipping formations |
| 03/17/2004 | EP1398459A2 Re-use of recovered treating fluid |
| 03/17/2004 | EP1398456A2 Hydraulic optimization of drilling fluids in borehole drilling |
| 03/17/2004 | EP1397579A1 Method, system and tool for reservoir evaluation and well testing during drilling operations |
| 03/16/2004 | CA2440493A1 Re-use of recovered treating fluid |
| 03/16/2004 | CA2221152C Downhole flow control devices |
| 03/11/2004 | WO2004020778A1 Automated method and system for recognizing well control events |
| 03/11/2004 | WO2004020775A2 Method and apparatus for removing cuttings |
| 03/11/2004 | US20040048751 Process for controlling gas migration during well cementing |
| 03/10/2004 | CN1141489C Directly sucking and reversely circular bottom slag-removing method and equipment before filling concrete for drilling cast-in-situ pile |
| 03/10/2004 | CN1141352C Clay-free biodegradable wellbore fluid and method for using said fluid |
| 03/09/2004 | US6703352 For use in fracturing a subterranean formation; as a drift control agent for agricultural formulations; detergents |
| 03/09/2004 | US6702940 Device for transporting particles of magnetic material |
| 03/09/2004 | US6702204 Cavitating jet |
| 03/04/2004 | WO2004018832A1 A method and device by a displacement tool |
| 03/04/2004 | WO2004018830A1 Wash out preventer |
| 03/04/2004 | WO2004018828A1 Reverse circulation directional and horizontal drilling using concentric coil tubing |
| 03/04/2004 | WO2004018827A1 Reverse circulation directional and horizontal drilling using concentric drill string |
| 03/04/2004 | US20040040749 Method and apparatus for removing cuttings |
| 03/04/2004 | US20040040746 Automated method and system for recognizing well control events |
| 03/03/2004 | EP1394353A2 Controlling gas migration during well cementing |
| 03/03/2004 | EP0900320B1 System and method for placement and retrieval of a subsurface diverting tool used in drilling and completing wells |
| 03/03/2004 | CN2605379Y Oil-water well deforming sand-flushing device |
| 03/02/2004 | US6698915 Manifold for mixing device |
| 03/02/2004 | US6698538 Drill bit having adjustable total flow area |
| 03/02/2004 | CA2207809C Cutting bed impeller |
| 03/02/2004 | CA2018754C Method of drilling and lining a borehole |
| 02/29/2004 | CA2436377A1 Process for controlling gas migration during well cementing |
| 02/26/2004 | WO2003006778A3 Drilling system and method for controlling equivalent circulating density during drilling of wellbores |
| 02/26/2004 | US20040035574 Packing assembly for rotary drilling swivels and pumps having rotating shafts |
| 02/25/2004 | EP1390602A2 Apparatus and method for the treatment of waste products |
| 02/25/2004 | CN1139420C Rotary well-drilling fluid filtering equipment and method for filtering well-drilling fluid using the same |
| 02/24/2004 | US6695077 Mixing with agglomerant, heating to vaporize contaminants |
| 02/24/2004 | US6695066 Surge pressure reduction apparatus with volume compensation sub and method for use |
| 02/24/2004 | US6695058 Method and apparatus for cleaning boreholes |
| 02/24/2004 | CA2086505C Control of fluid flow in oil wells |
| 02/21/2004 | CA2437635A1 Method and apparatus for wellbore fluid treatment |
| 02/21/2004 | CA2437519A1 Hydraulic optimization of drilling fluids in borehole drilling |
| 02/19/2004 | WO2003048526A3 Composition for use in sealing a porous subterranean formation, and methods of making and using |
| 02/19/2004 | WO2002074699A3 Method for regeneration of used halide fluids |
| 02/19/2004 | US20040031623 System and method for recovering return fluid from subsea wellbores |
| 02/19/2004 | US20040031622 Methods and apparatus for drilling with a multiphase pump |
| 02/18/2004 | CN1476510A Hydraulic drill string accumulator |
| 02/17/2004 | US6693554 Casing mounted sensors, actuators and generators |
| 02/12/2004 | WO2004013456A1 Drilling arrangement |
| 02/12/2004 | WO2004013455A1 Decontamination of drill cuttings and other waste material |
| 02/12/2004 | WO2004013448A2 Method for using coconut coir as a lost circulation material for well drilling |
| 02/12/2004 | WO2004013446A2 Self-excited drill bit sub |
| 02/12/2004 | US20040026130 Hydraulic drill string accumulator |
| 02/12/2004 | US20040026091 Tubing fill and testing valve |
| 02/11/2004 | CN2603190Y Jet-flow sand flushing device |
| 02/11/2004 | CN1474166A Cement mortar flow metering method for dam foundation rock grouting |