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Inflatable straddle packer

  • US 4,962,815 A
  • Filed: 07/17/1989
  • Issued: 10/16/1990
  • Est. Priority Date: 07/17/1989
  • Status: Expired due to Term
First Claim
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1. A straddle packer apparatus, comprising:

  • a housing having a central housing opening, and having packer inflation passage means defined in said housing, and having a treating fluid passage defined in said housing with an outlet of said treating fluid passage communicating with an exterior of said housing;

    upper and lower longitudinally spaced packers mounted on said housing on opposite sides of said outlet of said treating fluid passage, said packers being in communication with said packer inflation passage means;

    an inner mandrel slidably received in said central housing opening, said mandrel having a mandrel bore and having an inflation port means and a treating port means each communicated with said mandrel bore; and

    lug and endless J-slot means, operably associated with said housing and said inner mandrel, for controlling a telescoping position of said mandrel relative to said housing in response to telescoping reciprocation without rotation of said mandrel relative to said housing, said mandrel being movable between an inflating position wherein said inflation port means of said mandrel is communicated with said inflation passage means of said housing and said treating port means of said mandrel is isolated from said treating fluid passage of said housing, and a treating position wherein said inflation port means of said mandrel is isolated from said inflation passage means of said housing and said treating port means of said mandrel is communicated with said treating fluid passage of said housing.

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