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Low pressure responsive tester valve with ratchet

  • US 4,667,743 A
  • Filed: 12/12/1985
  • Issued: 05/26/1987
  • Est. Priority Date: 12/12/1985
  • Status: Expired due to Term
First Claim
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1. An annulus pressure responsive tester valve apparatus, comprising:

  • a tool housing having a central flow passage extending therethrough from the top to the bottom thereof;

    a power piston slidably disposed in said housing;

    a first pressure conducting passage means for communicating a well annulus with a first side of said power piston;

    a second pressure conducting passage means for communicating said well annulus with a second side of said power piston;

    retarding means, disposed in said second pressure conducting passage means, for delaying communication of a sufficient portion of a change in well annulus pressure to said second side of said power piston for a sufficient time to allow a pressure differential between said first side and said second side of said power piston to move said power piston relative to said housing;

    flow tester valve means, disposed in said housing for selectively opening and closing said central flow passage in said housing, and movable between a closed position wherein said central flow passage is closed, and an open position wherein said central flow passage is open; and

    lug and slot ratchet means, operably connecting said flow tester valve means with said power piston, for moving said flow tester valve means between its said closed and open positions in response to movement of said power piston relative to said housing.

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