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:
Jun. 15, 2004
Filed:
Nov. 21, 2000
David L. Ford, Katy, TX (US);
Bill Mair, New Iberia, LA (US);
ABB Vetco Gray Inc., Houston, TX (US);
Abstract
A wear bushing has a lower portion that is landed on a casing hanger in a wellhead housing. An upper portion of the wear bushing has a shear ring in a locking profile that locks the wear bushing to the casing hanger. A locking ring resides in a bore of the wear bushing and has passages for fluid flow. The inner surface of the locking ring has teeth for engaging the teeth of a running tool when the tool is moved upward relative to the wear bushing. A plurality of locking keys extend radially inward through the bore of the wear bushing beneath the locking ring. A beveled ridge on the tool mates with the locking ring. The wear bushing is mounted to the tool which is joined to a drill string. With the locking keys locked on the tool, the wear bushing is lowered down the well into the wellhead housing. The wear bushing is landed on the casing hanger and the locking pins are pressed upward as they contact a seal assembly. The wear bushing is rotated until the locking pins align and fall into slots. With the locking pins in the slots, the wear bushing cannot be rotated relative to the casing hanger. The tool is released from the wear bushing by opposite rotation, and the tool may then be run deeper into the well.