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:
Nov. 26, 1996
Filed:
Aug. 09, 1995
Stephen L Albright, Houston, TX (US);
Michael W Hayes, Lafayette, LA (US);
Jimmy L Hollingsworth, Cypress, TX (US);
Guy L McClung, III, Spring, TX (US);
Weatherford U.S., Inc., Houston, TX (US);
Abstract
A new tool has been developed for, in one aspect, facilitating release of a tubular string coupled between a travelling block and elevators with insufficient clearance to release elevator slips in order to remove the tubular. In one aspect the releasing tool is effectively shortened permitting release of the elevators. Such shortening is effected by releasing an expansion sub and piston within the tool for relative movement with respect to other parts of the tool. Initially the expansion sub and piston are held in place by fluid in a first chamber. Movement of fluid from the first chamber and movement of fluid into a second chamber housing the piston results in piston movement (and movement of the expansion sub which is secured to the piston) to effectively shorten the tool. In one aspect the fluid moves in a closed loop between the chambers and no fluid is expelled to the environment. In another aspect only one fluid chamber is used.