Patents for E21B 7 - Special methods or apparatus for drilling (22,064)
04/1987
04/14/1987US4657436 Device and method for removing irregularities in or enlarging an underground duct
04/14/1987CA1220416A1 Multi-drain drilling and petroleum production start- up device
04/14/1987CA1220385A1 Vessel mooring system
04/09/1987WO1987002091A1 A method and a device for deep hole drilling
04/09/1987DE3534662A1 Guided driving head of an apparatus for penetrating the soil
04/08/1987CN85107194A Drilling method by means of diving hole hammer driven by supercharging machine
04/07/1987US4655299 Drilling assembly
04/01/1987EP0216100A2 Boring ram with a piston-actuated percussion cutter
04/01/1987EP0215998A2 A pile driver, pile drawer and/or drilling machine
03/1987
03/31/1987US4653810 Pre-bolting system for underground mines
03/31/1987US4653598 Drainhole drilling assembly with oriented elliptic drill collar
03/31/1987US4653594 Vibration generating apparatus
03/26/1987DE3625577A1 Small drilling device
03/24/1987US4651834 Melting, heaters
03/24/1987CA1219577A1 Rotating boring tool with percussion device
03/17/1987US4650374 Apparatus for driving pipes through the ground
03/17/1987US4650011 Method and apparatus for drilling a hole in an ice formations and pumping water out from such hole
03/17/1987CA1219253A1 In-the-hole drill
03/10/1987US4649349 Device for automatically compensating the magnetism of drill string members
03/10/1987US4648746 Pipe laying and replacement
03/10/1987US4648469 Alleviating vortex shedding stress problems
03/10/1987US4648454 Robot
03/05/1987DE3628328A1 Apparatus for making narrow cuts or trenches
03/04/1987EP0212316A1 Drill string for deflection drilling, method of using such a string and deflecting device used in this string
03/04/1987EP0211926A1 Drilling pipe for making a drill string
03/04/1987EP0211925A1 Drilling pipe for making a drill string
03/03/1987US4646856 Downhole motor assembly
03/03/1987US4646855 Method for raising and lowering a drill string in a wellbore during drilling operations
03/03/1987US4646836 Tertiary recovery method using inverted deviated holes
02/1987
02/25/1987EP0211725A1 Device for positioning a tool in a drain pipe of a drilled well
02/24/1987US4646277 Control for guiding a boring tool
02/24/1987US4645084 Robot arm
02/17/1987US4643264 Method for reducing drilling torque in the drilling of a deviated wellbore
02/17/1987CA1218052A1 Method for improving cuttings transport in deviated wells
02/12/1987DE3631424A1 Method of disposing of harmful substances with simultaneous energy generation
02/11/1987CN86200087U Slant-proof apparatus for level hole drilling
02/10/1987US4641717 Connector housing
02/10/1987US4641716 Method and equipment for rock drilling
02/10/1987CA1217759A Drilling equipment
02/10/1987CA1217758A System to control the vertical movement of a drillstring
02/04/1987EP0210735A2 Improvements in or relating to drilling apparatus
02/03/1987US4640552 Method and apparatus for splitting ice masses
02/03/1987US4640369 Slide bar mining bolting machine
02/03/1987US4640362 Well penetration apparatus and method
02/03/1987US4640353 Electrode well and method of completion
02/03/1987CA1217474A1 Angle drilling apparatus
02/03/1987CA1217473A1 Method of and arrangement for positioning of a drilling apparatus
02/03/1987CA1217472A1 Method and apparatus for controlling azimuthal drift of a drill bit
01/1987
01/31/1987CN85102785A Underearth propeller
01/28/1987EP0209686A2 Process and device for pretreating an old underground pipeline for replacement by a new one
01/27/1987US4639868 Control method for drilling apparatus which makes use of a final drilling pattern transformed from primary and secondary patterns
01/27/1987US4638873 Direction and angle maintenance tool and method for adjusting and maintaining the angle of deviation of a directionally drilled borehole
01/27/1987US4638871 Earth drill rig
01/27/1987CA1217182A1 Surface controlled bent sub for directional drilling of petroleum wells
01/21/1987EP0209318A2 Control of drilling courses in the drilling of bore holes
01/21/1987EP0209217A2 Apparatus and method for forming an enlarged underground arcuate bore and installing a conduit therein
01/20/1987US4637756 Apparatus for removing and replacing pipe beneath an earthfill
01/20/1987US4637480 Azimuth measuring method for non-vertical drilling
01/20/1987US4637479 Methods and apparatus for controlled directional drilling of boreholes
01/20/1987US4637475 In-the-hole drill
01/14/1987EP0208038A2 Energy dissipating receptacle for fluid jet cutting systems
01/13/1987US4635738 Drill bit
01/13/1987US4635736 Drill steering apparatus
01/07/1987EP0207925A2 Gallery driving machine
01/07/1987EP0207576A1 Apparatus for determining the positioning and measuring the depth, on which a construction or object is positioned in the ground
01/07/1987CN86104189A Vessel for dicrease the energy of high speed jeted flow liquid
01/06/1987US4634313 Pipe laying and replacement
01/06/1987US4633953 Method for offshore production of hydrocarbons concurrently with the installation of a structure therefor
01/06/1987CA1216276A1 Apparatus and method for extracting horizontal underground pipe
12/1986
12/30/1986US4632194 Self-propelled saverdrill
12/30/1986US4632191 Steering system for percussion boring tools
12/30/1986EP0206855A1 Method and device for detecting a fluid flow
12/30/1986CA1215965A1 Slip assembly for subsea template
12/23/1986US4630967 Arrangement for underground advance driving of pipe trains composed of individual pipe lengths
12/23/1986US4630689 Pump drive
12/23/1986US4630681 Multi-well hydrocarbon development system
12/23/1986CA1215551A1 Assembly of conductor guides for offshore drilling platform
12/17/1986EP0201398A1 Composition for oriented drilling
12/16/1986US4629012 Drainhole drilling assembly
12/16/1986US4629010 Process and device for sinking wells
12/16/1986US4629008 Reversible percussive action machine
12/10/1986EP0204474A1 Methods and apparatus for controlled directional drilling of boreholes
12/10/1986EP0204187A1 Improved erosive-jet diver tool
12/09/1986US4627502 Liquid-filled collar for tool string
12/09/1986US4627499 Mobile drilling machine
12/09/1986CA1215115A1 Device for automatically compensating the magnetism of drill rods
12/03/1986EP0203907A1 Drill wagon for drilling excavation and rockbolt holes
12/03/1986CN86102188A Trench excavator
12/02/1986US4626134 Apparatus and method for extracting horizontal underground pipe
12/02/1986US4625815 Drilling equipment, especially for use in underground mining
12/02/1986CA1214768A1 Hydraulic piston-effect method and apparatus for forming a bore hole
11/1986
11/26/1986EP0202310A1 A method for establishing a connection from the sea bed to a tunnel positioned below
11/25/1986US4624605 Shield tunneling apparatus
11/25/1986US4624328 In-shaft drilling apparatus for recovery of gas from subterranean formations
11/25/1986US4624327 Method for combined jet and mechanical drilling
11/25/1986US4624326 Process and apparatus for cutting rock
11/25/1986US4624318 Method and means for storing a marine riser
11/20/1986WO1986006784A1 Well tool for use with down-hole drilling apparatus
11/20/1986EP0202013A2 Steering and control system for percussion boring tools
11/19/1986CN85103611A Sleeve-type drilling-direction changer