| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 12/11/2013 | CN203335001U Lengthened core-taking gun with multiple core taking tubes |
| 12/11/2013 | CN102606070B Combined drilling technique of vegetable gum diamond coring and downhole hammer casing drilling |
| 12/05/2013 | US20130319763 Soil sampler |
| 12/04/2013 | CN203321393U Medium-soft rock core extractor |
| 12/04/2013 | CN203321392U High-pressure water-driven horizontal rope rolling coring device |
| 12/04/2013 | CN203321391U Clamping block type impact power transmission mechanism for wire line coring impact rotary drilling |
| 12/04/2013 | CN203321390U Collection system for collecting rock center samples |
| 11/28/2013 | US20130313024 Core Drilling Tools With Retractably Lockable Driven Latch Mechanisms |
| 11/27/2013 | CN203308413U Large-diameter drilling and coring device for soft-and-hard interbedding rock masses |
| 11/27/2013 | CN203308402U Drilling and sampling drill rod |
| 11/27/2013 | CN103410463A Deep hole inner pipe in-place alarming rope coring drilling tool and pressure detection system used by same |
| 11/20/2013 | EP2663729A2 Cutting apparatus |
| 11/20/2013 | CN203296731U Automatic filling and sampling mechanism for rock sample |
| 11/20/2013 | CN203296696U Drilling coring tool for ooze stratum |
| 11/20/2013 | CN102080503B Continuous directional coring and deflecting machine tool with dual tubes for outer guiding and inner drilling and deflecting method thereof |
| 11/19/2013 | CA2671061C Core drill bit with extended matrix height |
| 11/13/2013 | CN203285374U Baffle spring covering-and-inlaying-type wire-line coding device structure for coal field |
| 11/13/2013 | CN203285360U Seismic exploration compound drilling drill rod |
| 11/13/2013 | CN203285331U Electric drilling rig |
| 11/12/2013 | US8579049 Drilling system for enhanced coring and method |
| 11/06/2013 | CN203271650U Deep ice lower bed rock core drill bit torque-resistant device |
| 11/06/2013 | CN203271649U Coring drilling machine |
| 11/06/2013 | CN203271648U Pneumatic impact coring combined drilling tool of annular alloy drilling bit |
| 11/06/2013 | CN203271647U Combined type coring device |
| 10/31/2013 | WO2013162841A2 Multi-fluid injector core holder |
| 10/23/2013 | CN101672170B Electric directional coring apparatus |
| 10/17/2013 | WO2013152457A1 Sidewall coring while drilling tool |
| 10/16/2013 | CN203239261U Underground corer and core storage barrel thereof |
| 10/16/2013 | CN103352671A Rope core taking drill |
| 10/16/2013 | CN103352670A Igniting screw of core barrel |
| 10/10/2013 | WO2013151435A2 Drill device |
| 10/08/2013 | US8550184 Formation coring apparatus and methods |
| 10/08/2013 | CA2712580C Method and system of monitoring rotational time of rotatable equipment |
| 10/03/2013 | WO2013142899A1 A core tray |
| 10/03/2013 | US20130256033 Multiple distributed pressure measurements |
| 09/26/2013 | WO2013052165A3 Methods and apparatus for coring |
| 09/25/2013 | CN102425378B Threaded drill bit with sliding chutes |
| 09/25/2013 | CN102128013B Diamond impregnated wire line coring geological bit and manufacturing method thereof |
| 09/18/2013 | CN203199927U Rope coring winching device directly connected with main winch |
| 09/18/2013 | CN103306623A High efficiency coring method for portable drilling machine in integral hard rock |
| 09/18/2013 | CN103306622A Hydraulically-pressurizing rope coring drill |
| 09/11/2013 | CN103291237A Circumferential locking device for coring in sediment stratum |
| 09/11/2013 | CN103291236A Clamp-block percussion power transmission mechanism for wire-line coring and percussive rotary drilling |
| 09/11/2013 | CN102155175B Pressure-releasing device for closed coring tool |
| 09/10/2013 | US8528662 Position indicator for drilling tool |
| 09/06/2013 | WO2013126955A1 Improvements to downhole surveying and core sample orientation systems, devices and methods |
| 09/04/2013 | CN103277062A Core drill bit anti-torque device for bed rock under deep ice |
| 09/04/2013 | CN103276730A Pile shoe for posture regulation and protection of underwater drilling machine |
| 09/03/2013 | CA2559085C Downhole core orientation tool |
| 08/28/2013 | CN203161146U Coring system performing coring with drilling |
| 08/28/2013 | CN102057130B Method and device for core drilling |
| 08/22/2013 | US20130213712 Coring Tool and Method |
| 08/21/2013 | CN203145879U Combined core drill for improving core-drilling effect of fractured stratum |
| 08/21/2013 | CN102155177B Wire-line core drilling hydraulic impactor |
| 08/21/2013 | CN101798924B Icebound type pressure-maintaining and temperature-preserving sampler |
| 08/15/2013 | WO2013119724A2 Instrumented core barrel apparatus and associated methods |
| 08/14/2013 | CN203130005U Coring tool core-blocking pressure-rising warning device |
| 08/14/2013 | CN203130004U Two-bearing hanging device of sealed coring tool |
| 08/14/2013 | CN203130003U Differential type air drilling coring device |
| 08/08/2013 | US20130199847 Instrumented Core Barrel Apparatus and Associated Methods |
| 08/07/2013 | CN203114220U Base plate of drilling coring machine |
| 08/07/2013 | CN203114219U Drilling coring device |
| 08/07/2013 | CN203114218U Non-hoisting hole bottom freezing rope coring drilling tool |
| 08/07/2013 | CN203114217U Coring and core-out device for well drilling |
| 08/07/2013 | CN203114180U Micro coring bit |
| 08/07/2013 | CN203114167U Light drilling machine capable of implementing wire-line coring drilling |
| 08/07/2013 | CN102182413B Device for locking and unlocking sampling tube in hollow drilling rod special for drilling soft rock stratum |
| 08/06/2013 | US8499856 Small core generation and analysis at-bit as LWD tool |
| 08/01/2013 | WO2013110197A1 Core barrel valve assembly |
| 08/01/2013 | WO2013110162A1 Core barrel head assembly |
| 08/01/2013 | WO2013110161A1 Core barrel head assembly |
| 08/01/2013 | WO2013110160A1 Core barrel valve assembly |
| 08/01/2013 | WO2013110159A1 Core barrel head assembly |
| 08/01/2013 | US20130192901 Up-hole bushing and core barrel head assembly comprising same |
| 08/01/2013 | CA2861963A1 Core barrel valve assembly |
| 07/25/2013 | WO2013106885A1 Improvements to equipment and methods for downhole surveying and data acquisition for a drilling operation |
| 07/24/2013 | CN203081369U Pitching device for oil drilling coring |
| 07/24/2013 | CN203081368U Coring and core protecting element of sediment stratum |
| 07/24/2013 | CN102102515B Coring selector with gear indication function for well wall |
| 07/23/2013 | CA2559030C Core sample orientation |
| 07/17/2013 | CN203066919U Pressure-expandable rock core blocking informing mechanism for wire-line coring drilling rig |
| 07/17/2013 | CN203066918U Rotating mechanism applicable to while drilling coring |
| 07/17/2013 | CN203066857U Drilling tool for clay layer drilling and coring |
| 07/16/2013 | US8485280 Core drilling tools with retractably lockable driven latch mechanisms |
| 07/16/2013 | CA2764539A1 Method for creating a 3d model of a hydrocarbon reservoir, and method for comparative testing of hydrocarbon recovery techniques |
| 07/10/2013 | EP2611986A1 Quickly reconfigurable core barrel head assembly |
| 07/10/2013 | CN103195385A Under-pressure wet drill coring drill bit |
| 07/10/2013 | CN103195366A Under-pressure wet drill coring method |
| 06/26/2013 | CN203022669U Drilling system for taking core while drilling |
| 06/26/2013 | CN203022668U Liquid nitrogen hole bottom freezing rope coring drilling tool |
| 06/26/2013 | CN103174393A Drilling coring device |
| 06/26/2013 | CN102322226B Self-locking and unlocking device for sampling pipe joints of hollow stems for soft formations |
| 06/20/2013 | WO2013088414A1 Method for preparing a sample of rock cuttings extracted from a subsoil and associated analysis assembly |
| 06/20/2013 | WO2013060720A3 Device and method for extracting a sample while maintaining a pressure that is present at the sample extraction location |
| 06/19/2013 | EP2604996A1 Method for preparing a sample of rock cuttings extracted from a subsoil and associated analysis assembly |
| 06/19/2013 | CN203008834U Rotary well wall chip taker |
| 06/13/2013 | US20130146365 Quickly reconfigurable core barrel head assembly |
| 06/12/2013 | CN202990924U Convenient-to-control corer drill rod |
| 06/12/2013 | CN103154422A Quickly reconfigurable core barrel head assembly? |
| 06/12/2013 | CN103147687A Ring-type cutting method for excavating rocks at bottom part of pit shaft of bored pile |