E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/06 (2006.01) E21B 4/02 (2006.01) E21B 19/22 (2006.01) E21B 33/068 (2006.01)
Patent
CA 2079071
The present invention relates to a method and apparatus for drilling a bore hole along a predetermined path, such as a vertical bore hole which transitions into a horizontally extending section. A coil tubing injector is provided which includes a length of coiled tubing wound on a storage reel having a leading end for injection into the bore hole and a trailing end coupled to a hydraulic fluid swivel. A pump is provided for pumping hydraulic fluid through the swivel and through the coiled tubing. An electrical conductor extends through the coiled tubing and is connected to a contact associated with the storage reel. A unit is provided for raising and lowering the leading end of the coiled tubing through the bore hole. A downhole tool is coupled to the leading end which includes a bit for drilling a bore hole when rotated. A motor is provided for rotating the bit in response to hydraulic fluid pumped therethrough. A housing is provided for the motor having a rigid bend which causes the bit to bore a slightly curving bore hole, the direction of which is determined by the attitude of the housing. An electrically operated steering unit is coupled to the housing for indicating by means of the electrical conductor extending to the surface the attitude of the housing. Finally an orientation unit connects the steering unit and the housing to the coiled tubing for rotating the steering unit and housing relative to the tubing to control the attitude of the housing and thus the path of the bore hole.
Goodman Charles Edward
Smith Michael L.
Cudd Pressure Control Inc.
Kirby Eades Gale Baker
LandOfFree
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