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:
Dec. 24, 1991
Filed:
Nov. 02, 1990
Joe Berry, The Woodlands, TX (US);
Hydratech, Houston, TX (US);
Abstract
An annular blowout preventer control system which provides a closing hydraulic pressure to the preventer in proportion to the well-bore pressure with an additive offset equal to the pressure required to energize the preventer. The control system utilizes an annular-type blowout preventer, a hydraulic pressure regulator valve, a pneumatic pressure regulating valve, and necessary controls, all mounted above a standard blowout preventer assembly on a well casing during drilling operations, or on the existing well head during workover operations. The regulator valve includes a diaphragm which operates to establish the initial closing pressure needed to seal the annular blowout preventer. After activation, changes in pressure in the well bore are sensed by the hydraulic pressure regulator valve, which delivers regulated closing pressure to the annular blowout preventer. The regulated closing pressure is proportional to the pressure encountered in the well bore.