System for controlled drilling of boreholes along planned profile
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United States of America Patent
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May 30, 1995
Issued Date -
N/A
app pub date -
Feb 18, 1993
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 automatically 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 drill bit; an appropriate motor for rotating said drill bit; a data processing system for storing a planned path; sensors for obtaining information for providing a profile of a drilled path of the borehole; a data processing system for comparing the drilled path with the planned path and for generating a correction signal representing the difference between the drilled path and the planned path; and a control system responsive to the correction signal to cause the drill string to follow a corrected path to cause the drilled borehole to coincide with the planned path.
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