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System and method for enhancing permeability of a subterranean zone at a horizontal well bore

  • US 7,419,223 B2
  • Filed: 01/14/2005
  • Issued: 09/02/2008
  • Est. Priority Date: 11/26/2003
  • Status: Expired due to Fees
First Claim
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1. A method for producing gas from a coal seam, comprising:

  • drilling a horizontal well bore in a coal seam using a non-invasive drilling fluid in an over-balanced drilling condition;

    forming on the horizontal well bore with the non-invasive drilling fluid a filter cake having a depth of less than four centimeters;

    inserting a liner into the horizontal well bore;

    reducing a down-hole hydrostatic pressure in the horizontal well bore by removing fluid from the well bore;

    collapsing the horizontal well bore around the liner; and

    producing fluids flowing from the coal into the horizontal well bore.

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