| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 03/29/2011 | CA2465658C Orientation device for a core sample |
| 03/23/2011 | CN201771454U Recyclable drilling rig |
| 03/16/2011 | CN201763287U Rope coring safety joint |
| 03/10/2011 | US20110056713 Single piezo-actuator rotary-hammering (sparh) drill |
| 03/03/2011 | WO2009142873A8 Downhole measurement of formation characteristics while drilling |
| 03/02/2011 | EP2288778A2 Sonic drill bit for core sampling |
| 03/02/2011 | CN201753591U Wire-line coring drill for tunnel subhorizontal holes |
| 03/02/2011 | CN201753585U Liquid-proof drilling bit and liquid-proof core boring tool |
| 02/24/2011 | WO2011020141A1 System for monitoring coring operations |
| 02/24/2011 | CA2771134A1 System for monitoring coring operations |
| 02/16/2011 | CN201747309U Hydraulic pressuring mechanism for pressuring type coring |
| 02/16/2011 | CN101975038A Device for sampling mud rock by cooling air and rock sample sampling method thereof |
| 02/10/2011 | WO2011016642A2 Oil-pressure type fixed piston sampler |
| 02/09/2011 | CN101967963A Formation coring apparatus and methods |
| 02/09/2011 | CN101220735B Coal seam wind and spray linked coal core drilling tools and its method for coal core drilling |
| 02/03/2011 | WO2011011839A1 Core drill and coring method |
| 02/03/2011 | WO2011011837A1 Inner tube of a core barrel |
| 02/03/2011 | CA2769312A1 Core drill and coring method |
| 02/01/2011 | US7878269 Monitoring apparatus for core barrel operations |
| 01/26/2011 | CN201723191U Concrete drill hole coring device |
| 01/26/2011 | CN201723190U Unconsolidated deposit hydraulic pressure type sealed coring tool |
| 01/20/2011 | US20110011646 Apparatus and methods for drilling a wellbore using casing |
| 01/19/2011 | EP2274500A2 Jointed spearhead assembly |
| 01/19/2011 | CN201714324U Scraper-type steel body PDC airtight coring bit |
| 01/19/2011 | CN201714323U Drilling coring device |
| 01/19/2011 | CN101949288A Direct-shear measuring method of drilling rock mass specimen preparation |
| 01/13/2011 | WO2011003990A2 Core barrel and related drilling apparatus and method |
| 01/13/2011 | US20110005833 Apparatus and method for making boreholes in the ground, the cross sections of which boreholes partially intersect |
| 01/13/2011 | CA2767487A1 Core barrel and related drilling apparatus and method |
| 01/12/2011 | EP2271818A2 Braking devices and methods for use in drilling operations |
| 01/12/2011 | CN201705255U Upper piston for drilling sealed coring |
| 01/12/2011 | CN201705209U Loose broken conglomerate stratum coring bit |
| 01/05/2011 | CN201695976U Novel diamond compact coring bit |
| 01/05/2011 | CN201695975U Safe salvaging and conveying device for extracting core of deep-hole rope |
| 01/05/2011 | CN201695974U Airtight coring bit |
| 01/05/2011 | CN101936143A Reclaimable drilling rig device |
| 01/04/2011 | US7861801 Method to detect coring point from resistivity measurements |
| 12/29/2010 | WO2010151490A1 Core sample preparation, analysis, and virtual presentation |
| 12/29/2010 | CN201687423U Ball pitching tool for pressurized coring |
| 12/29/2010 | CN101928890A Cr-containing steel for wire line core drilling and manufacturing method thereof |
| 12/29/2010 | CA2765962A1 Core sample preparation, analysis, and virtual presentation |
| 12/22/2010 | CN201679497U Ice blocking type pressure-maintaining and heat-preservation sampler |
| 12/22/2010 | CN1789656B Marking system and method |
| 12/22/2010 | CN101235710B Impact type double tube double-motion coring device and its method |
| 12/21/2010 | CA2480473C Method and device for deviated coring and/or drilling |
| 12/15/2010 | CN201671580U Visual protection type coring liner |
| 12/15/2010 | CN201671579U Composite core gripper |
| 12/15/2010 | CN201671578U Shrapnel launcher used in borehole wall coring instrument |
| 12/02/2010 | WO2009083805A3 Subsurface formation core acquisition system usinghigh speed data and control telemetry |
| 12/01/2010 | CN101899955A Cord type coring tool for coal seams |
| 11/24/2010 | CN201650177U Shaft wall coring gun |
| 11/17/2010 | CN201635686U Drill core pipe |
| 11/17/2010 | CN101886528A Cord core drilling tool for tunnel subhorizontal hole |
| 11/11/2010 | US20100282516 Formation coring apparatus and methods |
| 11/11/2010 | US20100282515 Sealed core |
| 11/10/2010 | CN201627552U Eccentric block core printer |
| 11/10/2010 | CN201627551U Core orientation device with drilling |
| 11/08/2010 | CA2703281A1 Sealed core |
| 11/02/2010 | CA2577110C A coring tubular and method for reducing contamination and processing speed of a core sample |
| 10/28/2010 | DE102008047905B4 Vorrichtung und Verfahren zum Handhaben und/oder Untersuchen einer Materialprobe Apparatus and method for handling and / or analysis of a sample of material |
| 10/27/2010 | CN201614904U 可调式岩样取芯钻机定位装置 Adjustable rock sample coring rig positioning device |
| 10/20/2010 | CN101864916A Hole bottom freezing cord coring drill and coring method thereof |
| 10/14/2010 | WO2010115284A1 Locking device for a drilling device |
| 10/13/2010 | CN201606022U 一种松散地层机械加压式密闭取心工具 A loose formation mechanical pressurized sealed coring tool |
| 10/07/2010 | WO2010114462A1 A method for the collection of samples of soil and a vehicle intended to be used with the method |
| 09/22/2010 | CN201588577U Active thermal insulation device adopted in coring |
| 09/22/2010 | CN201588576U Downhole coalbed sealed coring device |
| 09/16/2010 | US20100230165 Orientation head |
| 09/15/2010 | CN201581840U Underbalanced coring tool |
| 09/15/2010 | CN201581839U Sealed coring tool |
| 09/08/2010 | CN1804622B Boring and coring process for roller compacted concrete |
| 09/07/2010 | US7789170 Sidewall coring tool and method for marking a sidewall core |
| 09/02/2010 | WO2010096861A1 Centralising core orientation apparatus |
| 09/02/2010 | WO2010096860A1 Head assembly |
| 09/02/2010 | CA2753514A1 Centralising core orientation apparatus |
| 09/02/2010 | CA2752894A1 Head assembly |
| 08/26/2010 | WO2010094060A1 Modular core orientation system |
| 08/26/2010 | CA2752390A1 Modular core orientation system |
| 08/19/2010 | WO2010091471A1 Downhole tool housing |
| 08/19/2010 | CA2752220A1 Downhole tool housing |
| 08/11/2010 | CN101798924A Icebound type pressure-maintaining and temperature-preserving sampler |
| 08/04/2010 | CN201539218U Strengthening single acting device for horizontal core drill tool |
| 08/04/2010 | CN101793130A Corer |
| 07/21/2010 | CN101118201B Rarefaction sludge sampler |
| 07/20/2010 | US7757782 Methods and apparatus for navigating a tool downhole |
| 07/07/2010 | CN101769135A Blocking ball device for horizontal well core drill |
| 07/07/2010 | CN101769134A Sealing core drilling device for underground coal seams and application method thereof |
| 06/30/2010 | CN101761317A Rock sample core taking fixture |
| 06/29/2010 | US7743827 Remote operation wire line core sampling device |
| 06/23/2010 | CN201513122U Lateral wall reinforcing center drill rig of ropes |
| 06/16/2010 | CN201507260U Single-action snap spring catcher for corers |
| 06/09/2010 | CN201502348U Positioning disc of electronic selector |
| 06/03/2010 | US20100133014 Core Catcher and Corer Having It |
| 06/02/2010 | CN201496017U Small-caliber deep hole core orientator |
| 06/02/2010 | CN101718166A Translational power head of all-hydraulic core drilling machine |
| 06/02/2010 | CN101215959B Double tube forced core-picking drill |
| 05/19/2010 | CN201474639U Hydraulic active hermetic core taking tool |
| 05/19/2010 | CN101709626A Drilling and coring delivery capacity adjustment joint |
| 05/18/2010 | CA2558447C Multiple distributed pressure measurements |
| 05/13/2010 | US20100116184 Submerged Substrate Plug Cutter and Related Method |