Apparatus and method for the dynamic measurement of a drill string employed in drilling
First Claim
1. An apparatus for use in determining drilling conditions in a borehole in the earth comprising:
- a drill string having a top end and a bottom end;
a drill bit connected to a bottom end of said drill string;
measurement means positioned in a cross-sectional area of said drill string, said cross-sectional area being transverse to a longitudinal axis of said drill string, said measurement means for taking measurements of a motion of said drill string and force resultant measurements of said drill string at said cross-sectional area; and
processing means interactive with the measurements taken by said measurement means so as to produce a quantified indication of a rotating and whirling motion of said drill string.
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Abstract
An apparatus and method for use in determining drilling conditions in a borehole in the earth having a drill string, a drill bit connected to an end of the drill string, sensors positioned in a cross-section of the drill string axially spaced from the drill bit, and a processor interactive with the sensors so as to produce a humanly perceivable indication of a rotating and whirling motion of the drill string. The sensors serve to carry out kinematic measurements and force resultant measurements of the drill string. The sensors are a plurality of accelerometers positioned at the cross-section. The sensors can also includes a plurality of orthogonally-oriented triplets of magnetometers. A second group of sensors is positioned in spaced relationship to the first group of sensors along the drill string. The second group of sensors is interactive with the first group of sensors so as to infer a tilting of an axis of the drill string.
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Citations
19 Claims
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1. An apparatus for use in determining drilling conditions in a borehole in the earth comprising:
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a drill string having a top end and a bottom end; a drill bit connected to a bottom end of said drill string; measurement means positioned in a cross-sectional area of said drill string, said cross-sectional area being transverse to a longitudinal axis of said drill string, said measurement means for taking measurements of a motion of said drill string and force resultant measurements of said drill string at said cross-sectional area; and processing means interactive with the measurements taken by said measurement means so as to produce a quantified indication of a rotating and whirling motion of said drill string. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for use in determining drilling conditions in a borehole in the earth comprising:
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a drill string having a top end and a bottom end; a drill bit connected to a bottom end of said drill string; no less than three distance-inferring sensors, each of said sensors having a transmitter and a receiver, each of said distance-infering sensors positioned in a cross-sectional area of said drill string transverse to a longitudinal axis of said drill string, each of said sensors having a different carrier frequency; and processing means interactive with said distance-infering sensors for determining an instantaneous position of a center of said drill string. - View Dependent Claims (12)
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13. A method of measuring and controlling drilling of a borehole in the earth by a drill string having a bottom hole drilling assembly having a drill bit connected to a lower end of the drill string, the method comprising the steps of:
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positioning a first plurality of sensors at a cross-sectional area of said drill string transverse to a longitudinal axis of said drill string; measuring an instantaneous rotating speed of said drill string with said sensors; measuring an instantaneous position of a center of said drill string with said sensors; and processing said instantaneous rotating speed and said instantaneous position so as to indicate a rotating and whirling motion of said cross-section of said drill string. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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Specification