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Liquid carbon dioxide cleaning of wellbores and near-wellbore areas using high precision stimulation

  • US 8,002,038 B2
  • Filed: 10/31/2007
  • Issued: 08/23/2011
  • Est. Priority Date: 12/18/2006
  • Status: Expired due to Fees
First Claim
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1. A method for cleaning a wellbore and near wellbore areas in a coal bed methane formation comprising the steps of:

  • inserting a desired length of tubing into said wellbore;

    introducing a treatment medium comprising liquid carbon dioxide through said tubing from a jetting tool at the distal end of the tubing and arranged to direct the carbon dioxide into one or more locations within said wellbore and into at least a portion of said formation adjacent to said wellbore;

    moving the tubing such that carbon dioxide is introduced to another location within said wellbore and into another portion of the formation adjacent the wellbore and vaporizing at least a portion of said treatment medium after it is injected into said wellbore.

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