| 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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| 07/16/2008 | EP1944464A2 Method for reducing aqueous content of oil-based fluids |
| 07/16/2008 | CN101220733A Method for improving foam well drilling efficiency by foam pre-evolution liquid device |
| 07/15/2008 | US7398839 Impact excavation system and method with particle trap |
| 07/15/2008 | US7398826 Well treatment with dissolvable polymer |
| 07/15/2008 | CA2500610C Well control using pressure while drilling measurements |
| 07/15/2008 | CA2477683C Method and system for controlling well circulation rate |
| 07/15/2008 | CA2408975C Device for sealing a bore hole and discharging drill cuttings and stripped excavation material |
| 07/15/2008 | CA2385092E Method and appartus for preventing accumulations of solids in a drilling fluid conditioning tank |
| 07/15/2008 | CA2366117C Downhole bypass valve |
| 07/15/2008 | CA2315969C Underbalanced drilling tool and method |
| 07/13/2008 | WO2008077499A1 Method to cure lost circulation |
| 07/13/2008 | CA2673860A1 Method to cure lost circulation |
| 07/10/2008 | WO2008082424A1 Vapor extracting and separator cleaning apparatus |
| 07/10/2008 | US20080164068 System and method for cleaning drill cuttings with degassed water |
| 07/10/2008 | US20080164036 Artificial Lift System |
| 07/09/2008 | CN201083093Y Drilling liquid-gas separator |
| 07/09/2008 | CN201083092Y Downhole operation dirty oil and sewage negative pressure reclaiming device |
| 07/09/2008 | CN201083091Y Downhole operation dirty oil and sewage receiving device |
| 07/09/2008 | CN101218041A Molded end cap for oilfield screens |
| 07/08/2008 | US7396455 Brine container with filter system |
| 07/08/2008 | US7396433 Process and arrangement for separating oil from oil containing materials |
| 07/08/2008 | US7395878 Drilling system and method |
| 07/08/2008 | US7395877 Apparatus and method to reduce fluid pressure in a wellbore |
| 07/08/2008 | CA2526034C Reverse circulation cementing process |
| 07/08/2008 | CA2365971C Arrangement in rock drilling apparatus |
| 07/05/2008 | CA2617048A1 Mini core in drilling samples for high resolution formation evaluation on drilling cuttings samples |
| 07/03/2008 | US20080156977 Methods and systems for determining mud flow velocity from measurement of an amplitude of an artificially induced radiation |
| 07/03/2008 | US20080156538 Water treatment pad for core drill |
| 07/03/2008 | DE102007062229A1 Fluidpumpensystem für ein Bohrlochwerkzeug, Verfahren zum Steuern einer Pumpe eines Bohrlochwerkzeugs sowie Verfahren zum Betreiben eines Pumpensystems für ein Bohrlochwerkzeug Fluid pumping system for a downhole tool, method for controlling a pump of a downhole tool and method for operating a pumping system for a downhole tool |
| 07/03/2008 | DE102004004121B4 Lakebehälter mit Filtersystem Lake reservoir with filter system |
| 07/03/2008 | CA2681907A1 Methods of oil and gas production using waste water from water purification processing |
| 07/03/2008 | CA2673525A1 Amylases and glucoamylases, nucleic acids encoding them and methods for making and using them |
| 07/02/2008 | EP1939392A2 Water treatment pad for core drill |
| 07/02/2008 | EP1937934A1 Apparatus and method for controlling the viscosity or the density of a drilling fluid |
| 07/02/2008 | EP1937933A1 An improved treatment of drill cuttings |
| 07/02/2008 | EP1937932A1 Device for the quantitative analysis of debris |
| 07/02/2008 | EP1937930A1 Separating device |
| 07/02/2008 | EP1937420A1 Shale shaker |
| 07/02/2008 | CN101210483A Continuous sand flushing technique and continuous sand flushing device thereof |
| 06/26/2008 | WO2008035215A3 Device for channeling solids and fluids within a reverse circulation drill |
| 06/26/2008 | CA2669403A1 Liquid carbon dioxide cleaning of wellbores and near-wellbore areas using high precision stimulation |
| 06/25/2008 | EP1936112A2 Method, system and tool for reservoir evaluation and well testing during drilling operations |
| 06/25/2008 | EP1934123A1 Drill cuttings storage and conveying |
| 06/25/2008 | CN201078204Y Antipollution well-washing device |
| 06/25/2008 | CN201078203Y Drilling fluids conveyer |
| 06/25/2008 | CN201078186Y Drive unit of drill top drive trench shaft bearing inside blow-out preventer |
| 06/24/2008 | US7389818 Method and device by a displacement tool |
| 06/19/2008 | WO2008073857A1 Offshore thermal treatment of drill cuttings fed from a bulk transfer system |
| 06/19/2008 | WO2008073343A1 Device and method for cleaning wells |
| 06/19/2008 | WO2008072002A1 A screen assembly for a vibratory separator |
| 06/19/2008 | US20080142225 Chemical deployment canisters for downhole use |
| 06/19/2008 | CA2657513A1 A screen assembly for a vibratory separator |
| 06/18/2008 | EP1931857A1 A method of fragmenting hard particles |
| 06/18/2008 | EP1625281B1 Reverse circulation cementing process |
| 06/18/2008 | CN201074488Y Device for preventing buphthalmos of downhole operation tool from blocking |
| 06/18/2008 | CN201074479Y Rotary joint of novel directional drilling machine for conveying slurry |
| 06/18/2008 | CN101203656A Dth-hammer drilling device and overburden drilling method |
| 06/17/2008 | US7387987 Rheology modifiers |
| 06/17/2008 | US7387986 amphiphilic polymeric rheology enhancer containing portion that is a partially hydrolyzed polyvinyl ester or partially hydrolyzed polyacrylate; increase rate of shear rehealing of fluids made with cationic, zwitterionic, amphoteric viscoelastic surfactant fluid; oil field drilling treatments, injecting |
| 06/17/2008 | US7387176 Down hole air diverter |
| 06/17/2008 | CA2572596C Flow control apparatus for use in a wellbore |
| 06/17/2008 | CA2490346C Apparatus and method for cleaning out sand from an underbalanced hydrocarbon producing well |
| 06/17/2008 | CA2384305C Abrasive jet drilling assembly |
| 06/17/2008 | CA2370186C Method and multi-purpose apparatus for control of fluid in wellbore casing |
| 06/12/2008 | WO2007001729A8 Metal debris cleanout system and method |
| 06/12/2008 | US20080135301 Arrangement For Sucking Dust |
| 06/12/2008 | US20080135300 Drill cuttings handling apparatus |
| 06/12/2008 | US20080135291 Apparatus for Responding to an Anomalous Change in Downhole Pressure |
| 06/11/2008 | EP1928769A1 Apparatus and method for conveying drill cuttings |
| 06/11/2008 | CN201071691Y Automatic slurry rinsing and recovery system for drilling platform |
| 06/10/2008 | US7383881 Stabiliser, jetting and circulating tool |
| 06/10/2008 | CA2407452C Apparatus and method for locating joints in coiled tubing operations |
| 06/10/2008 | CA2381360C Downhole bypass valve |
| 06/10/2008 | CA2360192C A pipe assembly and lubricating method |
| 06/05/2008 | WO2008064923A1 Method and apparatus for the downhole transfer of drill cuttings |
| 06/05/2008 | WO2008064469A1 Recycling of oil-based drilling muds |
| 06/05/2008 | WO2008064452A1 Downhole drilling compositions and methods of preparation |
| 06/05/2008 | WO2008064385A1 Device for drilling into rock material |
| 06/05/2008 | WO2008064384A1 Device for percussion drilling or rotary percussion drilling in rocky material |
| 06/05/2008 | US20080128173 Drill Cuttings Transfer System and Related Methods |
| 06/05/2008 | US20080128140 Methods and apparatus for wellbore construction and completion |
| 06/05/2008 | US20080128136 Well maintenance equipment and procedure |
| 06/05/2008 | US20080128135 Dehydrating treatment of oil and gas wells |
| 06/05/2008 | CA2670921A1 Method and apparatus for the downhole transfer of drill cuttings |
| 06/05/2008 | CA2670053A1 Downhole drilling compositions and methods of preparation |
| 06/04/2008 | EP1927721A1 Method and apparatus for downhole transfer of drill cuttings |
| 06/04/2008 | EP1926884A2 Sub-surface deployment valve |
| 06/04/2008 | CN201068748Y Horizontal well continue sand-flushing device |
| 06/04/2008 | CN201068747Y Hollow grouting anchoring-bolt |
| 06/04/2008 | CN201068733Y Aerated drilling safety gas injection device |
| 06/04/2008 | CN101191405A Rotary digging drilling machine jet flow reverse circulation rock drilling technique |
| 06/04/2008 | CN100392209C Rock salt deposit horizontal chamber type oil-gas depot and its building method |
| 06/03/2008 | US7381332 by mixing water in oil emulsions comprising polymer derived from water soluble monomers |
| 06/03/2008 | US7380617 Drill cuttings handling apparatus |
| 06/03/2008 | CA2498437C Method for increasing the reaction efficiency of acetic and/or formic acid |
| 06/03/2008 | CA2452045C Apparatus and method for transporting waste materials |
| 06/03/2008 | CA2412519C Apparatus and methods for making a screen and a screen made by the method |
| 05/29/2008 | WO2008063072A1 Assembly for pressure control when drilling and method to control pressure when drilling in a formation with unpredictable high formation pressure |
| 05/29/2008 | US20080121396 Completion apparatus and methods for use in hydrocarbon wells |
| 05/29/2008 | US20080121392 Closed loop multiphase underbalanced drilling process |