Measuring and testing – Borehole or drilling – Downhole test
Patent
1995-03-28
1995-11-28
Chilcot, Richard
Measuring and testing
Borehole or drilling
Downhole test
33302, 324323, 1662542, 367 14, E21B 4700
Patent
active
054697360
ABSTRACT:
An apparatus and a method are provided for measuring the caliper of a borehole, and the standoff of a drilling tool from the walls of a borehole during a drilling operation. The apparatus includes three or more sensors, such as acoustic transducers arranged circumferentially around a downhole tool or drill collar. The transducers transmit ultrasonic signals to the borehole wall through the drilling fluid surrounding the drillstring and receive reflected signals back from the wall. Travel times for these signals are used to calculate standoff data for each transducer. The standoff measurements may be used to calculate the caliper of the borehole, the eccentricity of the tool in the borehole, and the angle of eccentricity with respect to the transducer position. The eccentricity and angle computations may be used to detect unusual movements of the drillstring in the borehole, such as sticking, banging, and whirling.
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Chilcot Richard
Dombroske George M.
Halliburton Company
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