| 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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| 03/26/2009 | WO2009018046A3 Chemical treatment of cuttings for re-injection into subterranean formations |
| 03/26/2009 | WO2009015184A3 Feed hopper for positive displacement pumps |
| 03/26/2009 | US20090079199 Electric generator operated by reciprocating wellbore pump and monitoring system used therewith |
| 03/26/2009 | US20090078466 Apparatus and Method for Driving Casing or Conductor Pipe |
| 03/25/2009 | EP2039878A1 Subsea lateral drilling |
| 03/25/2009 | EP2038504A1 Selective agitation of downhole apparatus |
| 03/25/2009 | CN201212365Y Well-washing and pumping pipe string for protecting oil layer |
| 03/25/2009 | CN201212357Y Pump suction type reverse circulation drilling machine |
| 03/25/2009 | CN201212355Y Civil drilling machine with sewerage recovering box |
| 03/25/2009 | CN101395336A Method and apparatus for managing variable density drilling mud |
| 03/24/2009 | US7507344 Method for recycling of oil based drilling fluid contaminated with water and water contaminated with oil based drilling fluid |
| 03/24/2009 | US7506706 Retaining element for a jack element |
| 03/24/2009 | US7506704 Downhole swivel joint |
| 03/24/2009 | US7506702 Method and apparatus for disposal of cuttings |
| 03/24/2009 | CA2490054C Closed loop multiphase underbalanced drilling process |
| 03/24/2009 | CA2489051C Filter assembly having a bypass passageway and method |
| 03/20/2009 | CA2621041A1 Enclosed circulation tool for a well |
| 03/19/2009 | WO2009035884A1 Method of using pressure signatures to predict injection well anomalies |
| 03/19/2009 | WO2009018539A3 Application of microturbines to control emissions from associated gas |
| 03/19/2009 | WO2009010932A3 Preparing a hydratable polymer concentrate for well treatment applications |
| 03/19/2009 | WO2008121490A3 Treatment for recycling fracture water - gas and oil recovery in shale deposits |
| 03/19/2009 | CA2699503A1 Method of using pressure signatures to predict injection well anomalies |
| 03/18/2009 | EP2037079A1 Apparatus and method for moving drill cuttings |
| 03/18/2009 | EP2035652A1 BORiNG HEAD WITH NEW PROTECTION HOOD |
| 03/18/2009 | EP2035645A1 Microtunnelling system and apparatus |
| 03/18/2009 | CN201209411Y Slurry and gas separator |
| 03/18/2009 | CN101387189A Double-walled well drilling air flow controller |
| 03/17/2009 | US7503406 Method for processing drilling cuttings in an oil recovery operation |
| 03/17/2009 | US7503397 Apparatus and methods of setting and retrieving casing with drilling latch and bottom hole assembly |
| 03/12/2009 | WO2008122901A3 Use of a chopper mechanism to add fibers to a well |
| 03/12/2009 | US20090065259 Methods of formulating drilling muds using processed waste waters |
| 03/11/2009 | EP2032795A2 Device for channeling solids and fluids within a reverse circulation drill |
| 03/11/2009 | EP2032794A1 Top filling tubing |
| 03/11/2009 | EP1937930B1 Separating device |
| 03/11/2009 | EP1397579B1 Method, system and tool for reservoir evaluation and well testing during drilling operations |
| 03/11/2009 | EP1242556B1 Acid based micro-emulsions |
| 03/11/2009 | CN201206444Y Composite tubing for plugging and acidizing construction downhole |
| 03/11/2009 | CN101382048A Defoaming method and device for eliminating foam of drilling fluid by thermal radiation |
| 03/11/2009 | CN100467828C Construction method of optical fiber television logging instrument for detecting fish top detection |
| 03/10/2009 | US7500529 Method and apparatus for predicting and controlling secondary kicks while dealing with a primary kick experienced when drilling an oil and gas well |
| 03/10/2009 | US7500528 Low temperature barrier wellbores formed using water flushing |
| 03/10/2009 | US7500518 Top drive swivel apparatus and method |
| 03/10/2009 | CA2496956C Reverse circulation drilling blowout preventor |
| 03/10/2009 | CA2465222C Additive for oil-based drilling fluids |
| 03/05/2009 | WO2009027750A2 A method for making a screen for a shale shaker |
| 03/05/2009 | WO2009027744A2 A method for making a screen for a shale shaker |
| 03/05/2009 | WO2009011594A3 Method and device for cleaning and sealing a well |
| 03/05/2009 | WO2008059240A3 Electromagnetic treatment of contaminated materials |
| 03/05/2009 | US20090057205 Vibratory separators and screens |
| 03/05/2009 | DE102007018788B4 Bohrgerät zum Einbringen von Bohrungen in den Erdboden Drill for drilling holes in the ground |
| 03/04/2009 | CN201202422Y Apparatus for recovering high-density drilling fluid aggravation material |
| 03/04/2009 | CN201202421Y Reverse circulation well drill |
| 03/04/2009 | CN101377122A Flow divider for sea petroleum well drilling |
| 03/03/2009 | US7497278 Methods of degrading filter cakes in a subterranean formation |
| 03/03/2009 | US7497266 Arrangement and method for controlling and regulating bottom hole pressure when drilling deepwater offshore wells |
| 02/26/2009 | WO2009026371A1 Automated borehole image interpretation |
| 02/26/2009 | WO2009024753A1 Switchable circulating tool |
| 02/26/2009 | WO2008115866A3 Completion method for well cleanup and zone isolation |
| 02/26/2009 | US20090050374 Method and apparatus for managing variable density drilling mud |
| 02/26/2009 | US20090050368 Downhole force measurement |
| 02/26/2009 | CA2696694A1 Switchable circulating tool |
| 02/26/2009 | CA2695638A1 Automated borehole image interpretation |
| 02/25/2009 | EP2027359A1 A fluid treatment system and method and use of same |
| 02/25/2009 | CN201198784Y Apparatus with gas control power fetching machine of oil rig diesel engine pump set |
| 02/25/2009 | CN201198744Y Packing apparatus capable of rapidly changing faucet |
| 02/24/2009 | US7493968 Treating a subterranean formation by providing a drilling mud comprising water, cement, and plurality of melt-processed inorganic fibers having a length of less than 10 millimeters and comprising basalt, wollastonite, or ceramic; circulating, cementing |
| 02/24/2009 | US7493949 Flow through subassembly for a downhole drill string and method for making same |
| 02/24/2009 | CA2407252C Bypass valve |
| 02/19/2009 | WO2009022914A1 Apparatus and method to maintain constant fluid circulation during drilling |
| 02/18/2009 | EP1573170B1 Method and system for circulating fluid in a well system |
| 02/18/2009 | CN201196057Y Centralizing oil layer well-washing protector |
| 02/18/2009 | CN201196047Y Filtering type bypass valve |
| 02/18/2009 | CN201196046Y Bypass valve mechanism |
| 02/18/2009 | CN201196045Y Down-hole jet stream decompression device |
| 02/18/2009 | CN201196044Y Adjustment device for drilling fluid vibration sieve |
| 02/18/2009 | CN201196043Y Internal conduction impeller-type nozzle for coiled tubing |
| 02/18/2009 | CN201196042Y Prizing individual well hot-washing vehicle |
| 02/18/2009 | CN201196041Y Automatic grouting liquid level monitoring apparatus for well drilling |
| 02/18/2009 | CN201196025Y Slurry injection system of horizontal orienting drill |
| 02/18/2009 | CN101368476A Injection-production column jacket anti-blocking protection device |
| 02/17/2009 | US7491682 Method of inhibiting or controlling formation of inorganic scales |
| 02/17/2009 | US7490672 System and method for processing drilling cuttings during offshore drilling |
| 02/12/2009 | WO2009020730A1 Eductor jet bushing for downhole use |
| 02/12/2009 | US20090038854 System and method for drilling wellbores |
| 02/12/2009 | US20090038852 Pumping System |
| 02/11/2009 | EP2021580A1 Rock drilling rig and method of controlling thereof |
| 02/11/2009 | CN201193499Y Large diameter and cleanable hole type packer |
| 02/11/2009 | CN101365861A Drill fluid collecting device |
| 02/11/2009 | CN101363311A Technological process for comprehensive treatment for waste drilling fluid following drill for oil-gas field |
| 02/10/2009 | US7490028 Method, apparatus and system for pore pressure prediction in presence of dipping formations |
| 02/10/2009 | US7488704 Fluid loss prevention; exhibits minimal difference between downhole equivalent circulating and surface densities; free of organophilic clays |
| 02/10/2009 | US7487846 Electrically operated drilling method |
| 02/10/2009 | US7487831 Downhole surge pressure reduction and filtering apparatus |
| 02/05/2009 | WO2009018173A2 Continuous flow drilling systems and methods |
| 02/05/2009 | WO2009018099A1 Reclamation of formate brines |
| 02/05/2009 | WO2009018046A2 Chemical treatment of cuttings for re-injection into subterranean formations |
| 02/05/2009 | WO2009017418A1 Sealing arrangement, and corresponding method |
| 02/05/2009 | WO2009016406A1 Method for removing oil from oil-contaminated material |
| 02/05/2009 | US20090032304 Mud level sensing system |
| 02/05/2009 | US20090032258 Openhole perforating |