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. 27, 2001
Filed:
Nov. 29, 1999
Applicant:
Inventor:
Irvine Cardno Brown, Aberdeen, GB;
Assignee:
Petroleum Engineering Services Limited, Aberdeen, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E21B 2/304 ; E21B 3/408 ; E21B 3/410 ;
U.S. Cl.
CPC ...
E21B 2/304 ; E21B 3/408 ; E21B 3/410 ;
Abstract
A downhole pressure activated device and a method of operating a tool comprises a chamber which has a fluid port for communication between the chamber and downhole fluid located outwith the device. The fluid port preferably comprises a check valve and a fluid flow restrictor connected in parallel, where preferably, the check valve permits fluid flow into the chamber and substantially prevents reverse flow. The chamber is provided with a pressure transmission means by which a pressure in the chamber greater than that in the downhole fluid is capable of being applied to a tool to be operated by the device.