| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 04/23/2009 | US20090101360 Device and system for well completion and control and method for completing and controlling a well |
| 04/22/2009 | EP2050923A1 Drilling device and method for taking soil samples |
| 04/16/2009 | WO2008108779A3 Extendable cutter drum for a boring machine |
| 04/02/2009 | WO2009042785A2 Sensors for estimating properties of a core |
| 04/02/2009 | WO2009042781A2 Apparatus and methods for continuous tomography of cores |
| 04/02/2009 | WO2009042774A2 Apparatus and methods for continuous coring |
| 03/26/2009 | US20090078467 Apparatus and Methods For Continuous Coring |
| 03/25/2009 | CN101392634A Reverse circulation impactor |
| 03/19/2009 | US20090071721 Drill core extractor |
| 03/19/2009 | US20090071716 Core orientation determination |
| 03/17/2009 | US7503404 Methods of well stimulation during drilling operations |
| 02/25/2009 | CN201198745Y Drilling and coring piston |
| 02/18/2009 | CN201196049Y Full sealing pin suspension type multipurpose coring tool |
| 02/12/2009 | US20090038853 Mini Core Drilling Samples for High Resolution Formation Evaluation on Drilling Cuttings Samples |
| 02/05/2009 | WO2008131772A3 Drilling system with a barrel drilling head driven by a downhole tractor |
| 01/29/2009 | US20090025942 Borehole Liner |
| 01/28/2009 | CN101353952A Coring method and apparatus for extracting downhole projecting coal bed integral coal core |
| 01/21/2009 | EP2016256A1 Orientation head |
| 01/21/2009 | CN201184195Y Core blocking monitoring alarm and internal barrel protecting device |
| 01/21/2009 | CN201184159Y Novel cable latch jack for fetching core with drill |
| 01/21/2009 | CN201184158Y Novel latch jack capable of self-freeing to fetch core with drill |
| 01/21/2009 | CN201184154Y Novel locking apparatus for fetching core with drill |
| 01/21/2009 | CN201184153Y Delivery machine capable of self-freeing to fetch core with drill |
| 01/21/2009 | CN101349148A Double-feedback fluid-control one-way throttle velocity modulation composite valve |
| 01/01/2009 | US20090000822 Rock Core Removal Method and Apparatus |
| 12/17/2008 | CN201165856Y Impact type double-tube and double-moving core-fetching apparatus |
| 12/11/2008 | DE19745947B4 Vorrichtung und Verfahren zum Bohren von Erdformationen Apparatus and method for drilling earth formations |
| 12/03/2008 | CN101315023A Selection type coring apparatus |
| 11/28/2008 | CA2633961A1 Low ground pressure and amphibious coring system |
| 11/20/2008 | WO2008140883A2 Remotely operated water bottom based drilling system using cable for auxiliary operations |
| 11/19/2008 | EP1992781A2 Improvements in or relating to core stabilization |
| 11/19/2008 | CN101308062A Self sealed self decompressed coal seam sampling method and apparatus |
| 11/18/2008 | CA2490128C Rotating drilling head drive |
| 11/13/2008 | US20080277167 Dry drilling and core acquisition system |
| 11/12/2008 | CN101302922A Construction method of horizontal orienting drill crossing sand cobble and gravel formation |
| 11/09/2008 | CA2588328A1 Dry drilling and core acquisition system |
| 11/06/2008 | WO2008132754A1 An apparatus for sectioning aqueous sediments |
| 11/06/2008 | WO2008131772A2 Drilling system with a barrel drilling head driven by a downhole tractor |
| 11/06/2008 | WO2008109102A3 Portable core flood apparatus for conducting on-site permeability measurements |
| 11/06/2008 | CA2684715A1 Drilling system with a barrel drilling head driven by a downhole tractor |
| 10/22/2008 | CN201137475Y Selection type core-picking device |
| 10/21/2008 | CA2516872C Digital core workflow method using digital core images |
| 10/07/2008 | US7431107 Coring bit with uncoupled sleeve |
| 10/07/2008 | CA2444545C Sampling isolator |
| 10/01/2008 | CN201125691Y Horizontal well horizontal segment reduced slanting core drill tool combination |
| 10/01/2008 | CN201125690Y Horizontal well horizontal segment increased slanting core drill tool combination |
| 09/25/2008 | WO2008113127A1 A core orientation tool |
| 09/12/2008 | WO2008109102A2 Portable core flood apparatus for conducting on-site permeability measurements |
| 09/12/2008 | CA2671246A1 Extendable cutter drum for a boring machine |
| 09/03/2008 | CN201110144Y Core-fetching throwing dragging machine for cable |
| 08/20/2008 | EP1601422B1 Apparatus for drilling a hole and method for its application |
| 08/06/2008 | CN201095966Y Coal gas rope coring tool |
| 08/06/2008 | CN101235710A Impact type double tube double-motion coring device and its method |
| 07/31/2008 | WO2008089579A1 Air hammer coring apparatus and method |
| 07/31/2008 | CA2676350A1 Air hammer coring apparatus and method |
| 07/17/2008 | WO2008085616A2 Fiber-containing diamond-impregnated cutting tools |
| 07/16/2008 | CN201087710Y Simulated coring test device |
| 07/16/2008 | CN101220735A Coal seam wind and spray linked coal core drilling tools and its method for coal core drilling |
| 07/16/2008 | CN100402795C Cutting tool and method of using same |
| 07/15/2008 | CA2366118C Core barrel |
| 07/10/2008 | WO2008082634A1 Multi-evaluation core logger |
| 07/09/2008 | CN101215959A Double tube forced core-picking drill |
| 07/03/2008 | US20080156537 Core Barrel Capacity Gauge |
| 07/03/2008 | US20080156534 Integrated Electrode Resistivity and EM Telemetry Tool |
| 07/01/2008 | US7392856 Rotating drum variable depth sampler |
| 06/26/2008 | WO2008076130A1 Antenna coupling component measurement tool having rotating antenna configuration |
| 06/26/2008 | CA2826590A1 Core drill bit with extended matrix height |
| 06/26/2008 | CA2671061A1 Core drill bit with extended matrix height |
| 06/25/2008 | EP1341989B1 Apparatus and methods for sponge coring |
| 06/25/2008 | CN101205800A Heavy-caliber base rock boring coring device |
| 06/17/2008 | US7387175 Window reaming and coring apparatus and method of use |
| 06/10/2008 | US7383899 Spearhead assembly |
| 06/05/2008 | US20080128170 Fiber-Containing Diamond-Impregnated Cutting Tools |
| 06/04/2008 | CN201068751Y Orientational coring graver inner cartridge shoe |
| 05/28/2008 | CN201065745Y Rock core box bracket |
| 05/27/2008 | US7377334 Rotating drilling head drive |
| 05/15/2008 | DE102005004580B4 Verfahren und Vorrichtung zur Aufbereitung von Bohrkernen unter Druckerhaltung Method and apparatus for processing cores under pressure maintenance |
| 05/08/2008 | WO2007112324A3 Method and system for scanning tubing |
| 05/02/2008 | WO2008008386A3 Modular geosteering tool assembly |
| 04/23/2008 | CN201050318Y Loose ground closed core-picking tool |
| 04/22/2008 | CA2455437C Coring bit with uncoupled sleeve |
| 04/16/2008 | CN201047262Y Core-extracting toolsinternal barrel |
| 04/08/2008 | CA2381487C A method for a valve, a valve and a wireline core drilling system including said valve |
| 04/03/2008 | WO2007136568B1 Core drill assembly with adjustable total flow area and restricted flow between outer and inner barrel assemblies |
| 04/03/2008 | DE10134928B4 Verwendung eines Vorschubantriebes Using a feed drive |
| 03/27/2008 | WO2008034174A1 Core barrel capacity gauge |
| 03/27/2008 | CA2661349A1 Core barrel capacity gauge |
| 03/26/2008 | EP1903179A1 Core container and method |
| 03/25/2008 | US7347284 Apparatus and method for hard rock sidewall coring of a borehole |
| 03/20/2008 | WO2008008386A9 Modular geosteering tool assembly |
| 03/18/2008 | US7346455 Wellbore evaluation system and method |
| 03/11/2008 | US7341118 Rotating dry drilling bit |
| 03/06/2008 | WO2008028197A1 Drill core trays and accessories for use therewith |
| 03/05/2008 | CN201031624Y Argillite layer drilling mouse teeth type diamond composite sheet coring drill |
| 02/26/2008 | CA2381477C Locking device for a wire line core drilling system |
| 02/21/2008 | WO2007136568A3 Core drill assembly with adjustable total flow area and restricted flow between outer and inner barrel assemblies |
| 02/06/2008 | CN101118201A Rarefaction sludge sampler |
| 01/30/2008 | CN201013254Y Mechanically pressurizing adaptor |
| 01/22/2008 | US7320373 One-step directional coring or drilling system |
| 01/22/2008 | CA2429167C Apparatus and methods for sponge coring |