Boring or penetrating the earth – Automatic control
Patent
1992-10-09
1995-08-08
Dang, Hoang C.
Boring or penetrating the earth
Automatic control
175 45, E21B 704, E21B 4400
Patent
active
054390648
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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Dang Hoang C.
Patton Consulting Inc.
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