Patents
Sitemap › E21 - Earth or rock drilling; Mining › E21B - Earth or rock drilling; Obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells › E21B 4 - Drives for drilling, used in the borehole
Patents for E21B 4 - Drives for drilling, used in the borehole (6,032)
12/1998
12/16/1998EP0884140A1 Hydraulic hammer having buffer assembly
12/16/1998EP0883730A1 A drilling apparatus
12/08/1998US5845721 Drilling device and method of drilling wells
12/03/1998WO1998054433A1 A percussive hammer drill
12/03/1998CA2291716A1 A percussive hammer drill
12/01/1998US5842528 Method of drilling and completing wells
11/1998
11/19/1998WO1998051900A1 Arrangement in a drilling apparatus
11/17/1998US5836089 Excavating equipment fitted with surface clamps
11/10/1998US5833541 Elastomeric joints having interlocking threaded portions
11/10/1998US5833444 Fluid driven motors
11/10/1998US5832604 Method of manufacturing segmented stators for helical gear pumps and motors
10/1998
10/28/1998EP0874126A1 Method and device for drilling by use of simultaneous percussion and rotation
10/27/1998US5826482 Hydraulic actuator
10/21/1998CN1196436A Device and process for operating working module
10/13/1998CA2143735C Drill string anchor
10/06/1998US5817937 Combination drill motor with measurement-while-drilling electronic sensor assembly
10/06/1998US5816342 Small diameter impact boring tool
10/01/1998WO1998032951A3 Method and device for driving bore-holes, especially in the sea bed, using a guide tip
09/1998
09/29/1998US5813465 Apparatus for completing a subterranean well and associated methods of using same
09/24/1998WO1998041726A1 Liquid driven impact device
09/23/1998EP0866210A2 Method for operating a tool and apparatus for transmission of rotary torque and speed of rotation of a drive unit to that tool
09/15/1998US5806404 Rotary piston driving mechanism
09/09/1998EP0862682A2 Autonomous downhole oilfield tool
09/09/1998EP0862679A1 Downhole equipment
09/08/1998US5803192 Drill bit retainer for a down hole hammer assembly
09/08/1998US5803188 Hydraulically driven percussion hammer
09/08/1998US5803187 For drilling a hole in the earth
08/1998
08/27/1998WO1998037300A1 Bottomhole assembly and methods of use
08/27/1998CA2578726A1 Bottom hole assembly and methods of use
08/26/1998EP0692061A4 Percussion drilling improvements
08/20/1998WO1998036149A1 Novel drilling device and method of use
08/18/1998US5795075 Spring cartridge rotor bearing
08/18/1998US5794718 Maneuvering impact boring head
08/18/1998US5794703 Wellbore tractor and method of moving an item through a wellbore
08/18/1998US5794516 Piston for a self-lubricating, fluid-actuated, percussive down-the-hole drill
08/12/1998EP0736128B1 Downhole motor for a drilling apparatus
08/06/1998WO1998034002A1 Bottom rotation shaft actuator
08/04/1998US5787999 For attachment to a down hole pneumatic hammer
08/04/1998US5787981 Oil field converting axial force into torque
07/1998
07/30/1998WO1998032951A2 Method and device for driving bore-holes, especially in the sea bed, using a guide tip
07/30/1998WO1998032945A1 Reverse circulation drilling system with bit locked underreamer arms
07/30/1998CA2279224A1 Reverse circulation drilling system with bit locked underreamer arms
07/28/1998US5785509 Wellbore motor system
07/23/1998WO1998012418A3 Autonomous downhole oilfield tool
07/23/1998EP0862682A3 Autonomous downhole oilfield tool
07/22/1998EP0854013A1 Tool for percussion apparatus
07/22/1998EP0853715A1 Apparatus and method for milling a well casing
07/14/1998US5778993 Locking a sample tube in a downhole hammer
07/14/1998US5778987 Guided drilling system with shock absorber
07/01/1998EP0851091A2 Downhole hammers
07/01/1998EP0851090A1 Down-the-hole hammer
07/01/1998EP0821767A4 Retention means
06/1998
06/23/1998US5769172 Power tool
06/18/1998DE19713791C1 Reversible ground displacing device with striker unit for e.g. earth drilling
06/17/1998EP0847477A1 Drill bit with set of underreamer arms
06/10/1998EP0846834A2 Boring ram with path control
06/05/1998CA2192131A1 Drilling with casing and retrievable bit-motor assembly
06/04/1998WO1998023883A1 Planetary gear, to be used specially in bore holes
06/04/1998DE19702983C1 Drilling head adapting efficiently to both soft and hard going
06/04/1998DE19650014A1 Ram boring tool
06/04/1998DE19649422A1 Planetengetriebe, insbesondere zum Einsatz in Bohrlöchern Planetary gear, in particular for use in boreholes
06/04/1998CA2223311A1 Percussion boring machine with run monitoring
06/03/1998EP0845070A1 Scraper for removing an earth core from a pipe laid without excavation
06/03/1998CA2223309A1 Percussion boring machine
06/02/1998US5758732 Control device for drilling a bore hole
06/02/1998US5758731 Method and apparatus for advancing tethers
06/02/1998US5758730 Method for removing an earth core out of a pipe laid in trench-less manner and go-devil for implementing the method
05/1998
05/20/1998EP0843071A1 Down the hole drill
05/19/1998US5752572 Tractor for remote movement and pressurization of a rock drill
05/14/1998WO1998020228A1 Turbodrill with reduction gear
05/12/1998US5749677 Apparatus for impact action
05/12/1998CA2190065A1 Down the hole drill
05/07/1998WO1998019041A1 Impact tool
04/1998
04/29/1998EP0837979A1 Drill bit retainer for a down hole hammer assembly
04/23/1998WO1998016720A1 Constant bottom contact thruster
04/23/1998WO1998016712A1 Apparatus and method for drilling boreholes
04/22/1998EP0837214A2 Percussive drill
04/22/1998CN2279435Y Hydraulic drill feed for well boring
04/14/1998US5738178 Method and apparatus for navigational drilling with a downhole motor employing independent drill string and bottomhole assembly rotary orientation and rotation
04/07/1998US5735358 Indexing percussive drilling bit
03/1998
03/31/1998US5733113 For use in a borehole
03/26/1998WO1998012418A2 Autonomous downhole oilfield tool
03/26/1998WO1998012410A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device
03/26/1998CA2266494A1 Coupling piece for use at simultaneous earth and/or rock drilling with an upper rotary percussion device and a lower percussion device
03/24/1998US5730235 Method and apparatus for removing material from a hole in a strata for use in forcing a member into material comprising or underlying this strata
03/19/1998WO1998011323A1 Tunnel boring machine
03/19/1998WO1998011321A1 Method and apparatus for driving an article into a medium
03/19/1998WO1998003309A3 Power tool
03/11/1998EP0828336A1 Cartridge rotor bearing with spring
03/10/1998US5725061 Downhole drill bit drive motor assembly with an integral bilateral signal and power conduction path
03/03/1998US5722495 Make up system of a down-the-hole hammer
02/1998
02/26/1998WO1998007951A1 Rotary-percussion drill apparatus and method
02/10/1998US5715897 In-hole rock drilling machine with a hydraulic impact motor
02/10/1998CA2054488C Reversible impact-operated boring tool
02/04/1998EP0821767A1 Retention means
01/1998
01/29/1998WO1998003309A2 Power tool
01/27/1998US5711205 Self-lubricating, fluid-actuated, percussive down-the-hole drill
01/21/1998EP0819828A2 Apparatus for completing a subterranean well and method of using same
01/21/1998EP0819827A2 Apparatus for completing a subterranean well and method of using same
01/21/1998EP0819825A2 Apparatus for completing a subterranean well and method of using same
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