| 摘要 |
<p>AbstractCHRISTMAS TREE AND WELLHEAD DESIGN[0019] The device described herein combines a subsea wellhead and a tree mandrel into asingle piece. The wellhead includes a tree valve block having an upper and lower section. The lower valve block section is integral with the wellhead and includes access between the production line and the tubing annulus to the main bore of the wellhead.Figure!.</p> |
