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DELAYED OPENING WELLBORE TUBULAR PORT CLOSURE

  • US 20120111574A1
  • Filed: 09/12/2011
  • Published: 05/10/2012
  • Est. Priority Date: 09/22/2010
  • Status: Active Grant
First Claim
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1. A wellbore tubular port closure assembly comprises:

  • a tubular housing including a wall defining an inner bore;

    a port through the wall of the tubular housing;

    a closure for the port, the closure having a port-closed position wherein the port is closed to fluid flow therethrough and the closure being actuable to move to a port-open position, wherein the port is exposed for fluid flow therethrough;

    a pressure driven mechanism for actuating the closure to an active position where the closure can move from the port-closed position to the port-open position; and

    a port opening delay mechanism configured to act after actuation of the pressure responsive mechanism to resist movement of the closure to the port-open position, wherein arrival at the port-open position is delayed until after a selected time has lapsed.

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