135172 ⎘
Special methods or apparatus for drilling; Directional drilling; Deflecting the direction of boreholes with means for locking sections of a pipe or of a guide for a shaft in angular relation, e.g. adjustable bent sub
DRILL BIT SHAFT STRUCTURE FOR EXCAVATION APPARATUS
#302Downhole adjustable bent-angle mechanism for use with a motor for directional drilling
#303Directional control drilling system
#304Tilted drive sub
#305Pressure orienting swivel arrangement and method
#306Lead the bit rotary steerable tool
#307Self-indexing down-the-hole drill
#308Adjustable angle drive connection for a downhole drilling motor
#309Apparatus and method for steering a drill bit
#310Position indicator for drilling tool
#311Steering device for downhole tools
#312Lead the bit rotary steerable system
#313Method and a device for directional control of a rock drilling machine
#314Flow operated orienter and method of directional drilling using the flow operated orienter
#315Drilling tool steering device
#316Adjustable bent housing apparatus and method
#317Lead the bit rotary steerable tool
#318Acid tunneling bottom hole assembly and method utilizing reversible knuckle joints
#319Directional drilling control using modulated bit rotation
#320Coiled tubing drilling system
#321Tool face sensor method
#322Acid tunneling bottom hole assembly
#323ADJUSTABLE BENT HOUSING WITH SINGLE OFFSET
#324Rotary vector gear for use in rotary steerable tools
#325Drill bit assembly for directional drilling
#326Steering system
#327ROTARY STEERABLE DRILLING APPARATUS AND METHOD
#328Directional drilling control
#329Regulator of angle and reactive moment of a gerotor type motor having a spindle and drilling bit in a bent drilling string
#330Rotary steerable drilling apparatus and method
#331Steerable bit system assembly and methods
#332Steerable bit system assembly and methods
#333Reduced-length measure while drilling apparatus using electric field short range data transmission
#334Method of locking tubular components in end to end relation
#335Orientation tool
#336System, method and apparatus for petrophysical and geophysical measurements at the drilling bit
#337Steering of bent housing mud motor downhole rotation device
#338Combined directional and impact drilling motor
#339Drill bit assembly for directional drilling
#340Drill bit assembly adapted to provide power downhole
#341Drill bit and system for drilling a borehole
#342ADJUSTABLE BENT HOUSING
#343Steerable drilling system and method
#344Flow operated orienter
#345Method and apparatus for forming a window in a casing using a biasing arm
#346Selectively actuatable expandable underreamer/stablizer
#347Jet assisted drilling method
#348Sleeved hose assembly and method for jet drilling of lateral wells
#349Steerable underreamer/stabilizer assembly and method
#350Re-settable locking mechanism for downhole tools
#351Casing reaming assembly
#352Drilling apparatus
#353Coiled tubing directional drilling apparatus
#354Drilling with casing
#355System and method for directional drilling utilizing clutch assembly
#356Steerable soil penetration system
#357Directional cased hole side track method applying rotary closed loop system and casing mill
#358System, method and apparatus for petrophysical and geophysical measurements at the drilling bit
#359Directional casing and liner drilling with mud motor
#360Expanded downhole screen systems and method
#361Three dimensional steering system and method for steering bit to drill borehole
#362Steerable bit assembly and methods
#363Smart clutch
#364Orienter for drilling tool assembly and method
#365Roll isolated rotary steerable systems employing digital valves
#366Air rotary system for a down hole drill assembly
#367Adjustable flex system for directional drilling
#368Self-adjusting downhole motor
#369Downhole apparatus and method for torsional oscillation abatement
#370Rotary bit pushing system
#371Downhole adjustable mud motor
#372Downhole adjustable mud motor