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:
Apr. 03, 1984
Filed:
Dec. 23, 1980
Applicant:
Inventor:
Howard L McGill, Lufkin, TX (US);
Assignee:
Schlumberger Technology Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B / ;
U.S. Cl.
CPC ...
166321 ; 166324 ; 166250 ;
Abstract
In accordance with an illustrative embodiment of the present invention, a pressure controlled well tester apparatus having a full-bore ball valve closure element includes valve actuator means responsive to changes in the pressure of fluids in the well annulus for moving the ball valve between its open and closed positions, and bias means responsive to the hydrostatic pressure of fluids in the well bore for assisting in moving the ball valve to its fully closed position.