Apparatus and method for remotely installing shoulder in subsea wellhead
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United States of America Patent
Stats
-
Oct 16, 2001
Grant Date -
N/A
app pub date -
Aug 6, 1999
filing date -
Aug 14, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A running tool is used to install a load shoulder and a wear bushing in a subsea wellhead. A subsea wellhead has a locator shoulder, and grooved upper and lower profiles. The running tool has a cylindrical wear bushing that lands on a locator shoulder provided in the bore above a grooved lower profile in a wellhead housing. The running tool also carries a load shoulder ring and a split lock ring. The installation process consists of preparing the tool before running the tool subsea. Flowby ports on the running tool remain open during installation to speed the trip-in operation. The flowby ports are closed by lowering the central mandrel after the running tool lands. Then a portion of the wear bushing is moved downward, which in turn pushes the load shoulder out into the lower grooved profile to retain the load shoulder ring and wear bushing with the wellhead.
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