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:
Mar. 31, 1987
Filed:
Jun. 17, 1985
Jose M Alandy, Camarillo, CA (US);
Vetco Gray Inc, Ventura, CA (US);
Abstract
A method and apparatus comprising a mudline casing hanger tieback adaptor with an adjustable load ring for connecting an installed subsea wellhead on the mudline suspension system. The mudline casing hanger tieback adaptor (180) includes a mudline hanger adaptor body (182) with an adjustable load ring 184, a packoff nut (104) and packoff (102), casing pup (186), and a tieback tool (190), all of which are lowered on a running tool to be connected to an already installed subsea wellhead (80) and sealably connected to an already installed casing hanger (64) on the innermost casing of a mudline supsension system. The adjustability of the load ring compensates for any tolerance buildup in the already installed casing (32) and adjustably shouldering the load ring (184) on the wellhead (80) transfers the load imposed on the innermost tieback tool (190) and casing hanger (70) back to the wellhead (80) during the high pressure testing of the packoff seal (202) between the tieback tool (190) and casing hanger. The annulus (200) between the mudline casing hanger tieback adaptor (180) and the wellhead (80) is sealed by setting the packoff (202) and the latter is locked down by an adaptor lockdown mechanism (234) threaded into the bore of the wellhead.