Wells – With below and above ground modification – Above ground actuating means for below ground device
Patent
1989-11-01
1991-02-19
Dang, Hoang C.
Wells
With below and above ground modification
Above ground actuating means for below ground device
166 80, 166 90, 166196, E21B 3303
Patent
active
049934880
ABSTRACT:
An expanding nipple, externally mounted packer has a body which mounts onto a stack of blowout preventers or a casing head and tubing spool or the like. The body contains an external locking mechanism and the upper ends of a pair of concentric mandrels which are lowered into the well casing, through the blowout preventer stack or other configuration of well head equipment. The outer mandrel has a deformable seal on its lower end and the inner mandrel has an expander on its lower end. A piston on the inner mandrel responsive to hydraulic pressure, raises the inner mandrel with respect to the outer mandrel so that the expander forces the seal outwards against the casing wall. The locking mechanism allows the seal to be locked in place. The hydraulic pressure on the piston is reversed to unseal the nipple.
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patent: 4867243 (1989-09-01), Garner et al.
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