Steerable drill string
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Issued Date -
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app pub date -
Apr 27, 2001
filing date -
Oct 6, 1999
priority date (Note) -
Abandoned
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Abstract
A rotatable steerable drill string in which guidance module controls the direction of the drilling. A magnetorheological fluid in the module supplies pressure to pistons that apply forces to the wall of the bore and thereby alter the direction of the drilling. The pressure applied by the magnetorheological fluid is regulated by valves that apply a magnetic field to the fluid so as to increase or decrease its fluid shear strength thereby controlling the actuation of the pistons and the direction of the drilling.
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