Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent
1991-02-01
1992-08-18
Britts, Ramon S.
Boring or penetrating the earth
Processes
Boring curved or redirected bores
175 73, 175107, E21B 704, E21B 708
Patent
active
051390949
ABSTRACT:
Methods are provided for controlling the direction of a borehole drilled by a downhole motor, including the steps of positioning downhole adjustable bent housing and near-bit stabilizer in the drill string, adjusting the bent housing from its normally straight condition to its bent condition to effect borehole curvature, and using the stabilizer in its undergage condition to enhance the inclination. The Measurements are made from which the inclination with respect to the vertical and the azimuth can be determined and telemetered uphole for processing, display, and recording. Preferably the directional measurements are made at two locations, one below the bent point and one above it. These two sets of measurements can be compared to confirm the bend angle and to obtain a definition of the orientation of the plane of the bend angle so that the drilling path can be accurately controlled. Use of the present invention eliminates having to superimpose rotation of the deflected drill string in order to drill straight ahead because the bend angle can be eliminated by downhole adjustment.
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Askew Warren E.
Eddison Alan
Prevedel Bernhard
Anadrill, Inc.
Britts Ramon S.
Moseley David L.
Ryberg John J.
Tsay Frank S.
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