Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1994-04-25
1995-11-14
Britts, Ramon S.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 45, 175 74, E21B 704, E21B 708
Patent
active
054657997
ABSTRACT:
A method determining a tool face angle of a downhole drilling assembly in a well bore including the steps of determining an apparent tool face angle, measuring torque at least at one downhole axial location along the drillstring in the well bore, correlating a change in the apparent tool face angle relative to a change in the torque so as to produce a graphical curve of the correlation, and identifying a slope discontinuity along the graphical curve. The slope discontinuity is indicative of a contact resistance between the drillstring and the well bore. This method further includes the steps of determining a differential twist angle from the graphical curve and inferring a true tool face angle by subtracting the differential twist angle from the apparent tool face angle. The step of determining the apparent tool face angle includes measuring the inclination angle and azimuth angle of the well bore. The torque is measured at substantially the same axial location as the apparent tool face angle. The torque or rotation applied to the drillstring is adjusted so as to obtain a desired true tool face angle.
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Britts Ramon S.
Tsay Frank S.
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