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:
Jul. 18, 1989
Filed:
May. 03, 1989
Robert O Lilley, Aberdeen, GB;
Vetco Gray Inc., Houston, TX (US);
Abstract
An annulus valve for a well concentric tubing hanger has features to prevent damage to the seals. The annulus valve has a closure sleeve that when moved to an open position, communicates fluid from an annulus between casing and tubing to a point above the tubing hanger. The lower end of the closure sleeve slides above an annulus port located on the exterior of the tubing hanger. A protector sleeve located below the closure sleeve protects a seal located below the annulus port when the closure sleeve moves to the open position. The protector sleeve is urged upward by a spring into contact with the lower end of the annulus sleeve. The protector sleeve has a stop that prevents further upward movement of the protector sleeve once the upper edge of the protector sleeve reaches the lower edge of the annulus port. This allows the closure sleeve to separate from the annulus sleeve to open the port.