Method and apparatus for the installation and withdrawal of pumping equipment in an underwater well
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United States of America Patent
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May 25, 1982
Grant Date -
N/A
app pub date -
Sep 25, 1980
filing date -
Sep 25, 1980
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Methods and apparatus are disclosed for transporting submergible pumping equipment between an underwater well and the water surface and for installing the equipment in and withdrawing the equipment from the well. The apparatus includes a container in the form of an elongate casing in which the equipment is suspended and which is raised and lowered between the wellhead and the surface to transport the equipment therebetween, the casing being connected to wellhead apparatus for installation and withdrawal of the equipment in the well. The casing is divided by a series of blowout preventers into an upper and a lower chamber. In use, the equipment is transported in the lower chamber and a diffractant solution is circulated through the lower chamber while the upper chamber is maintained at a high liquid pressure to provide a barrier inhibiting leakage of contaminants from within the lower chamber to the outer environment.
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