| 摘要 |
<p>PURPOSE: To precisely monitor a wellhead by providing a plurality of passages extending through a wellhead housing, communicating respective one ends with a plurality of annuli in a housing, and communicating the other ends with sea surface. CONSTITUTION: A plurality of passages 52, 54, 56 extending through a wellhead housing are provided and the each one end is connected to one of a plurality of annuli 60, 62, 64 in the wellhead housing 24. The other end is communicated with the annulus partitioned in a joint between the upper end of the wellhead housing 24 and a spool connected thereto. The interval between the annulus to the sea surface 82 is communicated with and appropriate method. This constitution can communicate the respective passages 52, 54, 56 communicated with the respective annuli 60, 62, 64 to the sea surface and precisely monitor the state of the subsea wellhead.</p> |
