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Dual-stage valve straddle packer for selective stimulation of wells

  • US 7,789,163 B2
  • Filed: 12/21/2007
  • Issued: 09/07/2010
  • Est. Priority Date: 12/21/2007
  • Status: Expired due to Fees
First Claim
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1. A dual-stage valve straddle packer for insertion into a wellbore and delivery of fracing and stimulation service to a particular zone of the wellbore comprising:

  • a. a body operatively connected to a tubing string, with fluid communication to the inner bore of the tubing;

    b. the body having an upper cup-seal for isolation of fluid delivered under pressure through fracing ports in the body below the upper cup-seal by sealing the annulus between the body and a casing of the wellbore;

    c. the body having a set of lower cup-seals for isolation, by a top lower cup-seal of the fracing ports from the wellbore below the top lower cup-seal, and by a bottom lower cup-seal of the wellbore below the bottom lower cup-seal from the fracing ports, each of the lower cup-seals being a one-way seal sealing a higher pressure side from a lower pressure side, the lower cup-seals deployed to seal the annulus between the body and the wellbore'"'"'s casing;

    d. a passageway from the wellbore below the bottom lower cup-seal through the body and a valve to ports in the body in fluid communication when the valve is open with the annulus between the body and the wellbore'"'"'s casing at a point above the bottom lower cup-seal and below the upper cup-seal;

    e. the valve being capable of opening and closing, responsive to a movement of the body in the wellbore, where an upward movement will close the valve and a downward movement will open the valve.

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