| Patents for E21B 25 - Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors (2,102) |
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| 06/05/2013 | CN202970625U Device for removing sealing fluid in process of taking rock core out of cylinder |
| 06/05/2013 | CN202970567U Pressure-bearing piston for pressurized coring tool |
| 06/05/2013 | CN202970566U Pressure-bearing device for pressurized coring tool |
| 05/29/2013 | EP2596205A1 Small core generation and analysis at-bit as lwd tool |
| 05/29/2013 | CN202954766U Top plug specially used for coring |
| 05/29/2013 | CN202954765U Rock core take and breakage device |
| 05/22/2013 | EP2594378A2 Drill core holder and hollow core drilling method using a drill core holder |
| 05/22/2013 | CN102102498B Rope coring system special for soft rock stratum drilling and using method thereof |
| 05/15/2013 | CN202937210U Friction welded core barrel structure |
| 05/08/2013 | EP2588703A1 Remotely operable underwater drilling system and drilling method |
| 05/08/2013 | CN202926287U Pressure reducing valve for air drilling coring tool |
| 05/08/2013 | CN202926270U Sealing element in air drilling core bit cavity |
| 05/08/2013 | CN202926269U Pressuring up-pull double-core-catcher combination coring tool |
| 05/02/2013 | WO2012095468A3 Cutting apparatus |
| 05/02/2013 | US20130105227 High productivity core drilling system |
| 05/02/2013 | CA2853196A1 Apparatus and process for extracting a sample while maintaining a pressure prevailing at the sampling site |
| 05/01/2013 | CN202914006U Pressurization type coring tool |
| 05/01/2013 | CN202914005U Core claw assembly suitable for pressurization type coring tool |
| 05/01/2013 | CN202914004U Rotating assembly suitable for pressurization type coring tool |
| 05/01/2013 | CN202914003U Automatic resetting multi-functional selector |
| 05/01/2013 | CN202914002U Ball suspension type core catcher coring drill |
| 05/01/2013 | CN101793130B Corer |
| 04/25/2013 | DE102011085192A1 Vorrichtung und Verfahren zur Probenentnahme unter Erhalt eines am Probenahmeort herrschenden Druckes Apparatus and method for sampling to obtain a ruling at the sampling pressure |
| 04/24/2013 | CN202900115U Mounted type full automatic core drilling machine |
| 04/24/2013 | CN202900050U Diamond impregnated side-wall coring bit |
| 04/24/2013 | CN202900048U Diamond-setting side-wall coring bit |
| 04/24/2013 | CN202900047U Push rod type rock coring bit |
| 04/24/2013 | CN103069102A Small core generation and analysis at-bit as lwd tool |
| 04/24/2013 | CN102182396B Core drilling machine power head capable of keeping off opening orifice |
| 04/24/2013 | CN101899955B Cord type coring tool for coal seams |
| 04/18/2013 | US20130092442 Full closure core catcher |
| 04/18/2013 | DE102011115895A1 Quick core tube for boring rock during formation of well, has friction reducing unit to reduce wall friction during feeding or raising of tube, and holding elements lowered or pulled up by drill string |
| 04/17/2013 | CN202882823U Sealing and cutting device of well mouth rock core |
| 04/17/2013 | CN202882822U Ball clamping type rope coring drill assembly structure |
| 04/17/2013 | CN202882821U Coring tool inner cylinder inspection push-puller |
| 04/17/2013 | CN202882820U Self-washing type loose ground coring tool |
| 04/12/2013 | CA2792205A1 Full closure core catcher |
| 04/11/2013 | CA2850764A1 Methods and apparatus for coring |
| 04/10/2013 | EP2576959A2 Core barrel restraint |
| 04/10/2013 | CN103032041A Self-propelled continuous core sample-cutting machine |
| 04/09/2013 | US8417495 Method of training neural network models and using same for drilling wellbores |
| 04/04/2013 | US20130081879 Downhole coring tools and methods of coring |
| 04/03/2013 | CN202850911U Spring type coring pitching connector device |
| 04/03/2013 | CN202850910U Breakage-proof coring clamping device |
| 04/03/2013 | CN103015932A Drilling system with function of coring while drilling |
| 04/03/2013 | CN103015931A Coring system with function of coring while drilling |
| 04/02/2013 | US8408332 Coring tool and method |
| 03/28/2013 | WO2013040641A1 Borehole surveying tool deployment |
| 03/28/2013 | CA2849001A1 Borehole surveying tool deployment |
| 03/27/2013 | CN202832330U Sand mechanism and drilling tool |
| 03/27/2013 | CN202832329U Drilling-in type sidewall corer scalding resistant device |
| 03/27/2013 | CN102996090A Sizing intercepting rock core drilling tool |
| 03/21/2013 | WO2013039962A1 Large core sidewall coring |
| 03/20/2013 | CN202810738U Downhole core drilling machine |
| 03/20/2013 | CN202810737U Drilling coring ball pitching joint device |
| 03/20/2013 | CN101769134B Sealed core drilling device for underground coal seams and application method thereof |
| 03/14/2013 | DE102011082658A1 Suspensionsentnahmevorrichtung Suspension removal device |
| 03/13/2013 | CN202788712U Tool for fishing well wall coring cylinder |
| 03/13/2013 | CN202788705U Positioning device for drilling and coring of outer heat-insulation layer of exterior wall |
| 03/13/2013 | CN101949288B Direct-shear measuring method of drilling rock mass specimen preparation |
| 03/07/2013 | WO2012170299A3 Method and system for abandoning a borehole |
| 03/07/2013 | US20130056280 Sonic latch mechanism |
| 03/06/2013 | CN202767924U Core ejecting device used for ejecting core out of core pipe |
| 03/06/2013 | CN202767911U Fully hydraulic intelligent type power catwalk |
| 03/06/2013 | CN202767887U Percussion drilling pore-forming rock sample extraction device |
| 03/05/2013 | US8387721 Orientation head |
| 02/28/2013 | WO2013028075A1 Adjustable eccentric bushing assembly for wireline-operated directional core barrel drill |
| 02/28/2013 | WO2013028074A1 Thrust bearing assembly for a wireline-operated directional core barrel drill |
| 02/27/2013 | CN202755933U In-place locking coring suspension positioning mechanism with double locks and single elastic clamp |
| 02/27/2013 | CN102947535A Core barrel restraint |
| 02/27/2013 | CN102943642A Lifting-free borehole bottom rope freezing coring drilling tool and method |
| 02/27/2013 | CN102943641A Liquid nitrogen hole bottom frozen rope core drilling tool and core-drilling method |
| 02/27/2013 | CN102943621A Portable drilling machine capable of implementing wire-line core drilling |
| 02/21/2013 | WO2013023299A1 Reservoir sampling tools and methods |
| 02/21/2013 | CA2844832A1 Reservoir sampling tools and methods |
| 02/20/2013 | EP2558675A1 Device and method for handling drill string components and drill rig |
| 02/20/2013 | EP2558674A2 Coring apparatus and methods |
| 02/20/2013 | CN202745778U Drilling device |
| 02/20/2013 | CN202745777U Small electric geological core drilling machine |
| 02/13/2013 | CN202731796U Closed combined wiring structure of well wall coring device |
| 02/12/2013 | CA2785095A1 Hydrocarbon formation core protection and transportation apparatus |
| 02/07/2013 | US20130032410 Core barrel assembly including a valve |
| 02/06/2013 | CN202718646U Oil well coring tester |
| 02/06/2013 | CN102913163A Pressure bearing device suitable for pressurized coring tool |
| 02/06/2013 | CN102913162A Deep-sea sediment continuous pressure maintaining coring submarine drilling machine and operation method |
| 02/05/2013 | US8365839 Substantially simultaneous core containment, core retrieval and borehole abatement |
| 02/01/2013 | CA2784195A1 Core barrel assembly including a valve |
| 01/31/2013 | US20130025943 Apparatus and method for retrieval of downhole sample |
| 01/31/2013 | US20130025938 Core sample orientation |
| 01/30/2013 | CN202706969U Core drill bit |
| 01/30/2013 | CN202706968U Wire line coring hydraulic hammer ballistic work transmission mechanism |
| 01/30/2013 | CN202706940U Coring tool for preventing inner barrel from tripping off |
| 01/30/2013 | CN202704913U Automatic rope arrangement winch for coring rope |
| 01/30/2013 | CN102906364A Coring apparatus and methods |
| 01/30/2013 | CN102900390A Pressurized coring tool |
| 01/30/2013 | CN101864916B Hole bottom freezing cord coring drill and coring method thereof |
| 01/23/2013 | CN202689931U Novel deep sea automatic extension rod pressure maintaining sampling drill |
| 01/16/2013 | CN202673214U Rock core topping seat |
| 01/16/2013 | CN202666552U Filter element of rotating well wall coring device |
| 01/16/2013 | CN101975038B Device for sampling mud rock by cooling air and rock sample sampling method thereof |