Production well-heads for underwater oil wells
AssigneeCompagnie Francaise des Petroles
InventorsJean-Pierre L. Boutet, Francois C. Gueuret
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Abstract
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.
Claims8
In a production well-head for an underwater oil well comprising a housing, a plurality of concentric tubings each provided with a suspension head, sealing means between each suspension head and said housing, a production tube, a suspension member for suspending said production tube from a suspension head of an innermost one of said tubings, said suspension member having a frusto-conical surface bearing on a frusto-conical surface of said suspension head of the innermost one of said tubings, and cement means for sealing between said innermost tubing and an outer tubing adjacent thereto at the lower end thereof, the improvement characterized by:
- a duct provided in said suspension head of said innermost tubing, said duct communicating with the space between said innermost tubing and the outer tubing adjacent thereto and with the interior of said innermost tubing, and said duct opening into an auxiliary space within said innermost tubing delimited by upper sealing means disposed between said suspension member and said suspension head of said innermost tubing and a lower sealing means bearing against said innermost tubing.
In a production well-head for an underwater oil well comprising a housing, a plurality of concentric tubings each provided with a suspension head, sealing means between each suspension head and said housing, a production tube, a suspension member for suspending said production tube from a suspension head of an innermost one of said tubings, said suspension member having a frusto-conical surface bearing on a frusto-conical surface of said suspension head of the innermost one of said tubings, and cement means for sealing between said innermost tubing and an outer tubing adjacent thereto at the lower end thereof, the improvement characterized by:
- a first duct provided in said suspension head of said innermost tubing, said duct communicating with the space between said innermost tubing and the outer tubing adjacent thereto and with the interior of said innermost tubing, said suspension member being provided with a second duct and with a lug, and the upper part of said innermost tubing having a guide slot for said lug, the opening of said first duct in said suspension head of said innermost tubing coinciding in sealing-tight relationship with the opening of said second duct in said suspension member, when said suspension member is assembled with said suspension head.
Dependencies are inferred from the claim text.