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Differential actuating system for downhole tools

  • US 5,101,907 A
  • Filed: 02/20/1991
  • Issued: 04/07/1992
  • Est. Priority Date: 02/20/1991
  • Status: Expired due to Term
First Claim
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1. A downhole tool apparatus for use in a well having a well bore and a tubing string suspended within said well bore so that a well annulus is defined between said well bore and said tubing string, said apparatus comprising:

  • a power piston having first and second sides; and

    operating valve means having a first position for selectively communicating annulus pressure from said well annulus with said first side of said power piston and simultaneously communicating said second side of said power piston with a zone of said well isolated from said annulus pressure so that a pressure differential between said well annulus and said zone moves said power piston in a first direction, and having a second position for subsequently communicating said annulus pressure with said second side of said power piston and simultaneously communicating the first side of said power piston with said zone so that said pressure differential between said well annulus and said zone moves said power piston in a second direction opposite said first direction.

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