Production well-heads for underwater oil wells

摘要

In a production well-head for an underwater oil well the suspension head of the innermost tubing, which has a frusto conical surface on which the production tube suspension member seats, has a duct leading from the enclosed space between the innermost tubing and the tubing adjacent thereto, to the interior of the innermost tubing, and a duct communicating therewith is provided in the suspension member.