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. 11, 1983
Filed:
Dec. 22, 1980
David L Gruller, Houston, TX (US);
Smith International Inc., Newport Beach, CA (US);
Abstract
A holddown assembly is mounted on a hanger suspending a string of casing or tubing into a well. A shoulder on the hanger engages a seat in the bore of the wellhead and has passages therethrough for connecting the annular spaces above and below the seat. The holddown assembly includes a rigid, radially expansible locking ring having an upwardly facing tapered surface, and a cam ring having an annular tapered surface for camming cooperation with the locking ring surface. The locking ring is disposed on the hanger shoulder opposite an internal groove in the wellhead. The cam ring threadingly engages the hanger and is releasably attached to the running tool whereby upon rotation of the running tool, the cam ring moves downwardly on the hanger threads and no seals are associated with the holddown assembly. The holddown assembly provides a positive holddown and permits locking the hanger down before, during, or after the cementing operation.