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Method and apparatus for bottom hole measurement

  • US 4,662,458 A
  • Filed: 10/23/1985
  • Issued: 05/05/1987
  • Est. Priority Date: 10/23/1985
  • Status: Expired due to Term
First Claim
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1. An apparatus for use in determining drilling conditions in a borehole in the earth comprising:

  • a drill string depending into a borehole;

    a drill bit connected to the lower end of said drill string;

    an instrument sub connected between the drill bit and drill string;

    measurement means in said instrument sub to measure circumferential shear strain and axial strain at at least three circumferentially spaced locations on said instrument sub; and

    means to process the measurements to obtain three force and three moment components on said instrument sub.

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