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:
Oct. 13, 1987
Filed:
Aug. 18, 1986
Glen H Cuiper, Spring, TX (US);
Hughes Tool Company, Houston, TX (US);
Abstract
An apparatus for connecting a riser to a wellhead housing for a tie-back connection allows connection without rotation or hydraulic actuation. A connector body is mounted to the lower end of the riser for lowering over the wellhead housing. Dogs are carried in the connector body, each having grooves on its interior for mating with grooves formed on the wellhead housing. Guide surfaces in the connector body allow the dogs to retract and extend, but only in directions perpendicular to the upper flanks of the wellhead housing grooves. Springs urge the dogs inwardly and downwardly to lock the connector body to the wellhead housing. A release mechanism allows the connector body to be pulled upwardly and removed from the wellhead housing.