E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 45/00 (2006.01) E21B 19/08 (2006.01) E21B 44/00 (2006.01)
Patent
CA 2143596
The present invention provides a drilling system for drilling a borehole. The system contains a drill stem having a drill bit at its one end for drilling the borehole. A draw works containing a drum having a line spooled thereon and coupled to the drill stem controls the upward and down ward motions of the drill stem. A draw works motor is coupled to the draw works for rotating the drum in both the clockwise and counter clock wise directions. A rotary motor is coupled to the drill stem for providing rotational speed to the drill stem. A control circuit controls the operation of the draw works and the rotary motor. The control circuit receives information from various sensors which includes information about the rate of penetration, weight on bit, hook load, and rotational speed of the drill bit. During operation, the control circuit controls the rotation of the draw works to control the upward and downward motions of the drill stem. In one mode the control circuit maintains a. desired rate of penetration and if the weight on bit exceeds an upper limit, it reduces the rate of penetration by reducing the unwinding speed of the drum. In another mode of operation, the control circuit causes the drilling to start at an initial rate of penetration and then starts to vary the rate of penetration according to programmed instructions to optimize the drilling efficiency. In another mode of operation the control circuit causes the drilling to start at initial rotary speed and the weight on bit values and then varies the weight on bit and/or the rotary speed to obtain the combination of these parameters that yields the most efficient drilling of the borehole. If a mud motor is used to drill a borehole, the control circuit may be programmed to control drilling as a function of the differential pressure across the mud motor.
Cassan Maclean
Dhindsa Jasbir S.
LandOfFree
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