| 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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| 08/28/2008 | CA2678511A1 Wellbore monitor |
| 08/27/2008 | EP1339938B1 Boring apparatus |
| 08/27/2008 | CN201106423Y Liquid-injecting valveless type control reversing continue sand-flushing device |
| 08/27/2008 | CN101250984A Well-washing sand prevention integrated technique tubular pile |
| 08/27/2008 | CN101250983A Single tube all-directional drilling injection slip-casting drilling bit capable of fluid-control starting and stopping auxiliary slip-casting hole |
| 08/26/2008 | US7417010 Process for treating an oil well |
| 08/26/2008 | US7416026 Apparatus for changing flowbore fluid temperature |
| 08/26/2008 | CA2470435C A pressure control system for a wet connect/disconnect hydraulic control line connector |
| 08/26/2008 | CA2369411C Method and system for controlling well bore pressure |
| 08/21/2008 | WO2008100193A1 Apparatus for rock drilling |
| 08/21/2008 | WO2008099161A1 Systems for actuating a downhole tool |
| 08/21/2008 | US20080200353 Aqueous erucyl amidopropyl betaine and an acid or salt, preferably sulfonic acids or aromatic carboxylic acids, chlorides of potassium, ammonium, calcium or tetramethylammonium, or calcium bromide; thickener for suspending particles during subterranean excavation |
| 08/21/2008 | US20080196943 Condition Checking Apparatus and Method |
| 08/21/2008 | US20080196903 Shoe for Wellbore Iining Tubing |
| 08/21/2008 | US20080196890 Magnetic power transmission devices for oilfield applications |
| 08/21/2008 | CA2674629A1 Rinsing device in a drill device for rock drilling |
| 08/20/2008 | EP1957744A1 Method for varying the density of drilling fluids in deep water oil and gas drilling applications |
| 08/20/2008 | CN201103357Y Packing and sealing device for oil-well rig water tap washing pipe |
| 08/20/2008 | CN201103356Y Packing and sealing device for oil-well rig water tap washing pipe with butterfly spring |
| 08/20/2008 | CN201103355Y Mud liquid level measuring and monitoring apparatus |
| 08/20/2008 | CN201103354Y Sand washing tool of horizontal well for preventing tubular pile deadlocking |
| 08/20/2008 | CN101245695A Drilling fluids and drill cuttings dry type splitter |
| 08/20/2008 | CN101245694A Down-hole drilling fluids separating mechanism |
| 08/20/2008 | CN100412311C Method and apparatus for realizing double-gradient well drilling |
| 08/19/2008 | US7413023 Wellhead seal unit |
| 08/19/2008 | US7413008 Tool for fluid filling and circulation during oilfield well tubing |
| 08/14/2008 | WO2008098031A1 Method and computer program product for drilling mud design optimization to maintain time-dependent stability of argillaceous formations |
| 08/14/2008 | WO2008095650A1 Equipment for intercepting and diverting a liquid circulation flow |
| 08/14/2008 | US20080194436 Methods for using reversible phase oil-based drilling fluid |
| 08/14/2008 | US20080190668 Separation Of Evolved Gases From Drilling Fluids In a Drilling Operation |
| 08/14/2008 | US20080190663 Method and System for Return of Drilling Fluid |
| 08/14/2008 | CA2677401A1 Equipment for intercepting and diverting a liquid circulation flow |
| 08/13/2008 | EP1954912A1 Drill fluid collecting device |
| 08/13/2008 | EP1954371A2 Apparatus and method for separating solids from a solids laden fluid |
| 08/13/2008 | CN201100106Y Water-injection and dust-proof device for tooth wheel driller |
| 08/13/2008 | CN201100105Y A drilling well liquid return pipe-taking line |
| 08/13/2008 | CN201100104Y Water-immersed pump suction anti-circulation turning driller |
| 08/13/2008 | CN201100103Y Multi-stage submerged pump well-washing machine |
| 08/13/2008 | CN201100102Y Rotary type milling sand-washing pen point |
| 08/13/2008 | CN101243238A An improved treatment of drill cuttings |
| 08/13/2008 | CN101240696A Water injection well high pressure well-washing system |
| 08/12/2008 | US7410014 Metal debris cleanout system and method |
| 08/12/2008 | US7410013 Boring and drilling apparatus |
| 08/12/2008 | US7409994 Circulating a drilling fluid containing solid phase weight material selected from barite, calcite, hematite, ilmenite; fluid phase is an oleaginous fluid selected from diesel oil, mineral oil, or synthetic oil; has rheological properties comparable to a conventional wellbore fluid |
| 08/12/2008 | CA2532907C One-position fill-up and circulating tool |
| 08/07/2008 | WO2008095065A2 High density slurry |
| 08/07/2008 | WO2008095061A2 Use of cuttings tanks for recycling oil based mud and water |
| 08/07/2008 | WO2008095039A2 Cuttings processing system |
| 08/07/2008 | WO2008095036A2 Use of cuttings tank for in-transit slurrification |
| 08/07/2008 | WO2008095029A2 Use of cuttings tank for slurrification on drilling rig |
| 08/07/2008 | WO2008092994A1 Drilling tool |
| 08/07/2008 | US20080185149 System and method for enhancing permeability of a subterranean zone at a horizontal well bore |
| 08/07/2008 | CA2675842A1 Drilling tool |
| 08/06/2008 | EP1951988A2 Downhole tool |
| 08/06/2008 | EP1951986A2 Apparatus and method for managed pressure drilling |
| 08/06/2008 | EP1951404A1 Arrangement for processing dust |
| 08/06/2008 | EP1819429B1 Dry polymer hydration apparatus and methods of use |
| 08/06/2008 | CN201095963Y Drilling fluid vibrating sifter |
| 08/06/2008 | CN201095962Y Highly effective drilling fluids sieving screen mesh |
| 08/06/2008 | CN101238272A Apparatus and methods for creation of down hole annular barrier |
| 08/06/2008 | CN101235709A Petroleum engineering circulating gas regeneration method and its special equipment |
| 08/06/2008 | CN101235705A All-cover type skid-mounted film separation and nitrogen-making device |
| 08/05/2008 | US7407022 Apparatus for pumping drill cuttings and dual cylinder positive displacement pump for moving drill cuttings and method of use |
| 08/05/2008 | US7407019 Method of dynamically controlling open hole pressure in a wellbore using wellhead pressure control |
| 07/31/2008 | WO2008073343A8 Device and method for cleaning wells |
| 07/31/2008 | WO2007001729B1 Metal debris cleanout system and method |
| 07/31/2008 | US20080179097 Use of cuttings tank for in-transit slurrification |
| 07/31/2008 | US20080179096 Use of cuttings tank for slurrification on drilling rig |
| 07/31/2008 | US20080179095 Use of cuttings vessel for tank cleaning |
| 07/31/2008 | US20080179058 Top drive swivel apparatus and method |
| 07/30/2008 | EP1950180A1 Chemical composition and process for treating liquid dispersions |
| 07/30/2008 | EP1948342A2 Apparatus and method for separating solids from a solids laden fluid |
| 07/30/2008 | EP1948341A2 Apparatus and method for separating solids from a solids laden fluid |
| 07/30/2008 | EP1676066A4 Internal blow out preventer ball and seat |
| 07/30/2008 | CN201092828Y Split type eddy flushing detritus cleaning machine |
| 07/30/2008 | CN101230777A Wellbore fluids for casing drilling |
| 07/29/2008 | CA2517111C Drilling rig floor drainage system |
| 07/29/2008 | CA2487100C Apparatus and method to reduce fluid pressure in a wellbore |
| 07/29/2008 | CA2417004C Gas and oil drilling composition |
| 07/24/2008 | WO2008088226A1 Drilling mud collector for a slip joint of a riser |
| 07/24/2008 | WO2008087446A1 Improved shoe for wellbore lining tubing |
| 07/24/2008 | WO2008087281A2 Measuring system and method for a horizontal shaft |
| 07/24/2008 | WO2008041017A3 Apparatus and method for separating solids from solids laden drilling mud |
| 07/24/2008 | US20080173453 Mill and method for drilling composite bridge plugs |
| 07/24/2008 | DE102008004401A1 Fern-Bohrfluidversorgungssystem und -Verfahren Remote Bohrfluidversorgungssystem and procedures |
| 07/24/2008 | CA2675667A1 Improved shoe for wellbore lining tubing |
| 07/23/2008 | CN201090658Y Apparatus for vibration damping of monitor |
| 07/23/2008 | CN201090155Y Oil-pumping polish-rod discus-base special-purpose taking-loading machine |
| 07/23/2008 | CN201090154Y New type drilling water tap |
| 07/23/2008 | CN201090134Y Novel water tap |
| 07/23/2008 | CN101228334A Apparatus and method for driving casing or conductor pipe |
| 07/23/2008 | CN101225737A Framework type clay mortar vibrating screen for petroleum and method for making same |
| 07/22/2008 | US7402549 Surfactants, betaines and quaternary amines; polyethylene glycol, polypropylene glycol block copolymer and a polynaphthalene sulfonate; increase rate of shear rehealing of fluids made with cationic, zwitterionic, amphoteric viscoelastic surfactant fluid; oil field drilling treatments, injecting |
| 07/22/2008 | CA2533779C Safety valve for use in an injection well |
| 07/22/2008 | CA2431373C Snap-lock seal for seal valve assembly |
| 07/22/2008 | CA2380286C Mechanism for dropping a plurality of balls into tubulars used in drilling, completion and workover of oil, gas and geothermal wells, and method of using same |
| 07/22/2008 | CA2303662C Mud saver kelly valve |
| 07/17/2008 | WO2008084192A1 Process for enhancing fluid hydration |
| 07/17/2008 | US20080169130 Wellbore fluids for casing drilling |
| 07/17/2008 | US20080169128 Remote drill fluid supply system and method |