System for controlled drilling of boreholes along planned profile
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United States of America Patent
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Aug 8, 1995
Issued Date -
N/A
app pub date -
Oct 9, 1992
filing date -
Dec 22, 1989
priority date (Note) -
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status (Latency Note)
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Abstract
An improved method and apparatus for controlling the direction of advance of a rotary drill to produce a borehole profile substantially as preplanned with minimal curvature while maintaining optimum drilling performance. The preferred embodiment of the system comprises a drill string; a rotatable drill bit carried on said drill string; and a compliant subassembly in said drill string, said compliant subassembly facilitating changes in the direction of drilling of said borehole. The system further comprises a plurality of sensors for measuring strains within the compliant subassembly and for producing data signals corresponding to the strain measurements. A control system is operable to use the data signals to change the direction of the borehole by applying a shear force to the drill bit.
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