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Mechanical caliper system for a logging while drilling (LWD) borehole caliper

  • US 9,217,323 B2
  • Filed: 03/14/2013
  • Issued: 12/22/2015
  • Est. Priority Date: 09/24/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • providing a first coil within a drill collar;

    providing a second coil in the moveable member;

    coupling the first and second coils with a coupling coefficient, k, wherein, k=M/√

    {square root over (L1L2)}≦

    0.9, M is a mutual inductance between the first and second coils, L1 is a first self-inductance of the first coil, and L2 is a second self-inductance of the second coil; and

    resonantly tuning the first coil at a first frequency, f1, with a first capacitance, C1, and the second coil at a second frequency, f2, with a second capacitance, C2, wherein f1 is approximately equal to f2,

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