Lockdown mechanism for well tools requiring fixed-point packoff

  • US 6,179,053 B1
  • Filed: 08/12/1999
  • Issued: 01/30/2001
  • Est. Priority Date: 08/12/1999
  • Status: Expired due to Term
First Claim
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1. An apparatus for securing a mandrel of a well tool in an operative position requiring fixed-point packoff in the well, comprising:

  • a first and a second lockdown mechanism arranged so that the mandrel is locked in the operative position only when both the first and the second lockdown mechanism are in respective lockdown positions;

    the first lockdown mechanism adapted to detachably maintain the mandrel in proximity to the fixed-point packoff when in the lockdown position, the first lockdown mechanism including a base member for connection to a wellhead of the well and a locking member for detachably engaging the base member; and

    the second lockdown mechanism having a range of adjustment adequate to ensure that the mandrel can be moved into the operative position and locked down in the operative position while the first lockdown mechanism is in the lockdown position.

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