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Methods of generating a gas in a plugging composition to improve its sealing ability in a downhole permeable zone

  • US 7,642,223 B2
  • Filed: 10/18/2004
  • Issued: 01/05/2010
  • Est. Priority Date: 10/18/2004
  • Status: Expired due to Fees
First Claim
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1. A method of servicing a wellbore, comprising:

  • circulating a drilling fluid in the wellbore;

    upon loss of circulation of the drilling fluid, introducing a plugging composition into the wellbore;

    allowing the plugging composition to flow into a permeable zone in the wellbore; and

    generating a gas in the plugging composition in situ within the permeable zone;

    wherein said generating the gas comprises introducing a first reactant and a second reactant to the plugging composition, and wherein the volume of the plugging composition increases by from about 0.1% to about 50% by total volume of the composition at a pressure of from about 3,000 psi to about 5,000 psi.

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