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Method and apparatus for multiple packer pressure relief

  • US 6,065,544 A
  • Filed: 03/26/1998
  • Issued: 05/23/2000
  • Est. Priority Date: 02/13/1996
  • Status: Expired due to Term
First Claim
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1. A method of inflating a packer means disposed about a casing in an annular space between an exterior of said casing and a wall of a well bore containing said casing, said packer means having valve means responsive to an increase in fluid pressure of a pressurized fluid supplied thereto for admitting the pressurized fluid to an interior of said packer means to thereby deploy said packer means, the method including the steps of:

  • supplying a supply fluid at a first predetermined pressure to said packer means for initially deploying said packer means,providing said casing, prior to inserting of said casing into the bore, with a relief valve means in the vicinity of sa d packer means, said relief valve means having inlet means in fluid communication with said annular space and outlet means in fluid communication with an interior of said casing, said relief valve means including actuating means responsive to said first predetermined pressure of the supply fluid of said packer means for placing said inlet means in fluid communication with said cutlet means, said actuating means being further responsive to a second predetermined pressure for closing said communication between said inlet means and said outlet means, wherein said second predetermined pressure is greater than said first predetermined pressure;

    whereby said actuating means of said relief valve means places said inlet means in communication with said outlet means to thereby allow bleeding of fluid within said annular space to the interior of said casing during inflation of said packer means; and

    characterized by varying the pressure of the fluid supplied to said packer means to said second predetermined pressure during a termination of the deploying of said packer means, whereby said actuator means of said relief valve means closes communication between the said annular space and the interior of said casing.

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