Cameron Iron Works, Inc.

Cooper Industries, Inc.

Eugene J Cegielski

Robert Lee Wilkins

Edward J Szymczak

James P McEver

The present invention relates to an improved subsea wellhead and to the method of retrieving the production string from the wellhead and the method of retrieving the tree from the wellhead. The wellhead includes a lower tubing hanger landing within the wellhead housing and an upper false tubing hanger landed within the tree. The upper false tubing hanger includes preps for receiving two plugs within its central bore above the radial bore through the upper tubing hanger which communicates with the radial bore through the tree through which production fluids flow from the well. A tubular member extends from the upper false tubing hanger to the lower tubing hanger and defines the flow passage through which production fluids flow between the two hangers. A sleeve surrounds the exterior of the tubular member and contains fluids communicated to the interior of the sleeve from the annulus surrounding the tubing string. Orienting means is provided to orient the upper false tubing hanger as it is being landed within the tree so that the radial passages in the upper false tubing hanger and the tree are in registry.

Subsea wellhead

A completion system or tree system for a subsea well having an anchor base on bottom surrounding a well bore, a conductor pipe lining the upper end of the well bore and connecting to the anchor base, a guide base landed on the anchor base and having an upwardly facing funnel positioned in the opening of the anchor base, and a production string extending through the conductor pipe and bending to a substantially horizontal position slightly above the guide base with the start of its gradual bend being below the funnel and with sharp bend production tubing bending immediately avove the funnel since no high profile guide base is present on the anchor base.

Subsea well completion apparatus

A tubular joint having two tubular members having an inner end tapered to provide sealing surfaces, means for joining the tubular members together with the tapered end surfaces adjoining each other, and a seal ring having an inner surface and tapered outer surfaces mating with the tapers of the tapered end surfaces and at least one port through the ring from the mid point of one of its tapered outer surfaces to its inner surface.

Growing community of inventors

Houston, TX, United States of America

Eugene J Cegielski