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Hydraulic system for electronically controlled pressure activated downhole testing tool

  • US 5,050,681 A
  • Filed: 07/10/1990
  • Issued: 09/24/1991
  • Est. Priority Date: 07/10/1990
  • Status: Expired due to Term
First Claim
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1. A downhole tool apparatus responsive to changes in pressure in a well annulus comprising:

  • a tool housing;

    a power piston slidably disposed in said tool housing, said piston having a first side and a second side;

    a first pressure conducting passage means, defined in said tool housing, for communicating said well annulus with said first side of said power piston;

    reference pressure means, disposed in said tool housing, for providing a reference pressure communicated with said second side of said power piston, so that a change in well annulus pressure creates a pressure differential across said power piston to move said power piston between a first position and a second position relative to said tool housing; and

    selectively operable deactivating means for temporarily deactivating said power piston so that said power piston is no longer responsive to changes in well annulus pressure.

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