E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/04 (2006.01) E21B 7/08 (2006.01)
Patent
CA 2505564
The following is a proposal for a new steerable drill design for the oil and gas industry. The design relies on variations in the rotational speed of the drill pipe (also called the drill string) controlled from the surface to steer the drill bit in the desired direction. The steering is accomplished by a hydraulic-mechanical system consisting of a hydraulic pump, a speed sensing device, coupled to a selector valve, which controls the angle of deflection of the bit and the direction of the deflection through 360 degrees. The device will also be able to drill in a straight line by eliminating the offset of the bit to zero degrees as the rotational speed of the drill string is increased beyond the directional drilling speed range. Rotation of the internal mechanism of the device, along with the rotation of the drill string will be prevented by an anti rotational device, consisting of a gravity sensing valve, hydraulic motor and wellbore tracking wheels. The device is fully hydro-mechanical in nature and does not incorporate mud motors or electronics of any kind and is capable being used with standard oil field drilling rigs, drill pipe and drill bits.
Na
Visser Jacobus Hendrik
LandOfFree
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