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Casing collar locator and method for locating casing collars

  • US 8,074,713 B2
  • Filed: 02/10/2011
  • Issued: 12/13/2011
  • Est. Priority Date: 08/30/2002
  • Status: Expired due to Fees
First Claim
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1. A casing collar locator, adapted to detect casing collars disposed in a wellbore, comprising:

  • a fiber optic line carrying an optical signal;

    a magnetic device adapted to become magnetically connected to a casing collar as the magnetic device passes the casing collar;

    a modulator that is functionally connected to the magnetic device;

    wherein the optical signal is modulated by the modulator when the magnetic device passes the casing collar;

    wherein the optical signal is modulated by imparting a strain on the fiber optic line;

    wherein the modulator comprises a fiber-bragg grating incorporated on the fiber optic line.

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