| 摘要 |
An adjustable mandrel hanger system is employed for maintaining tension in a string of casing extending between a subsea wellhead assembly and a surface wellhead housing. The system has a mandrel which connects into the string. A locking member locks to the exterior of the mandrel. The locking member has a cocked position which allows both upward and downward movement of the mandrel relative to the locking member. The locking member has a weight supporting position which will prevent downward movement of the mandrel but allows upward movement of the mandrel relative to the locking member. The locking member lands on an internal shoulder in the surface wellhead housing while the string is being lowered into the well. The running tool has an actuating member which will hold the locking member in the cocked position and in engagement with the internal shoulder while the running tool secures the lower end of the casing string into engagement with the subsea wellhead assembly. The actuating member will move upward relative to the locking member to allow the locking member to move to the weight supporting position, so that a release of the pull by the running tool will cause the locking member to support the string in tension.
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