Method and device for rotary well drilling
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United States of America Patent
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Mar 9, 2004
Grant Date -
Nov 21, 2002
app pub date -
Jun 20, 2002
filing date -
Jul 25, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a method which includes the steps of: introducing into a pre-drilled portion of a well (16) a drilling system containing a drilling bit (11) assembled with tubular lining elements (15), an element for measuring the inclination and azimuth direction of the pre-drilled part of the well, an element for rotary friction (26, 27) against the wall of the pre-drilled part and an element capable of modifying the friction coefficient of the friction element against the wall; measuring the azimuth direction of the pre-drilled part of the well (16); and varying the friction coefficient of the friction element (26, 27) sufficiently to influence the azimuth direction of the next well portion to be drilled.
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