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:
Jan. 12, 1988
Filed:
Dec. 30, 1985
Dale E Meek, Sugar Land, TX (US);
Schlumberger Technology Corporation, Houston, TX (US);
Abstract
In the representative embodiments of the new and improved methods and apparatus disclosed herein, a full-bore reversing and circulating valve is cooperatively arranged to be tandemly coupled in a typical string of drillstem testing tools including a pressure-actuated test valve. Pressure-actuated valve means are arranged within the housing of the new and improved apparatus of the present invention and adapted for movement therein in an extended span of travel between spaced upper and lower port-opening positions in response to changes in the direction of the pressure differential acting on the valve means. Indexing means are provided which include a sleeve member rotatably arranged on the valve means and ratchet-and-pawl means cooperatively arranged for incrementally advancing the sleeve along multiple angular positions around the valve means in response to the longitudinal movements of the valve means. Stop means are also provided on the valve means and sleeve for blocking the movement of the valve means to its port-opening positions until the sleeve has been advanced to a predetermined angular position in relation to the valve means.