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Ranging methods for developing wellbores in subsurface formations

  • US 8,011,451 B2
  • Filed: 10/13/2008
  • Issued: 09/06/2011
  • Est. Priority Date: 10/19/2007
  • Status: Expired due to Fees
First Claim
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1. A method for forming two or more wellbores in a subsurface formation, comprising:

  • forming a first wellbore in the formation;

    directionally drilling a second wellbore in a selected relationship relative to the first wellbore;

    transmitting a first electromagnetic wave from a first transceiver in the first wellbore and sensing the first electromagnetic wave using a second transceiver in the second wellbore;

    transmitting a second electromagnetic wave from the second transceiver in the second wellbore and sensing the second electromagnetic wave using the first transceiver in the first wellbore;

    continuously assessing a position of the second wellbore relative to the first wellbore using the sensed first electromagnetic wave and the sensed second electromagnetic wave; and

    adjusting the direction of drilling of the second wellbore so that the second wellbore remains in the selected relationship relative to the first wellbore.

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