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CLOSED LOOP WELL TWINNING METHODS

  • US 20130333946A1
  • Filed: 06/15/2012
  • Published: 12/19/2013
  • Est. Priority Date: 06/15/2012
  • Status: Active Grant
First Claim
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1. A closed loop method for drilling a twin well along a predetermined path with respect to a target well, the target well being cased with a metallic liner, the method comprising:

  • (a) rotary drilling the twin well using a drill string including a drill bit, a current generating tool, a rotary steerable tool, and a magnetic field sensor;

    (b) inducing an electrical current in the target well liner using the current generating tool while rotary drilling in (a), said induced electrical current resulting in a magnetic field about the target well;

    (c) making a plurality of magnetic field measurements using the magnetic field sensor while rotary drilling in (a);

    (d) processing the plurality of magnetic field measurements made in (c) to obtain new rotary steerable tool settings; and

    (e) changing a direction of rotary drilling using the new steering tool settings obtained in (d).

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