The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 13, 1994
Filed:
Feb. 16, 1993
Eugene J Cegielski, Houston, TX (US);
Robert L Wilkins, Houston, TX (US);
Cooper Industries, Inc., Houston, TX (US);
Abstract
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.