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. 13, 2004
Filed:
Nov. 02, 2001
Bruce McGarian, Stonehaven, GB;
Ian Gillies, Brechin, GB;
Smith International, Inc., Houston, TX (US);
Abstract
The present invention relates to bypass valves for use in wellbores, particularly but not exclusively to bypass valves used during the setting of hydraulic anchor packers. A bypass valve ( ) is provided with a piston ( ) slidably mounted adjacent a body member ( ) having at least one opening ( ) extending therethrough. The piston ( ) is moveable between a first position establishing a passage from the interior of the body ( ) to the exterior thereof via the at least one opening ( ) and a second position isolating the interior of the body ( ) from the exterior thereof. A second piston may be provided for increasing, in response to a predetermined fluid pressure differential across the length of the piston ( ), the force exerted on the piston ( ) by a given flow of fluid through the bypass valve ( ) such that the resultant force on the piston ( ) is insufficient to move the piston ( ) to the second position. Thus, the bypass valve ( ) is adapted to provide an indication at the surface of an imminent closure. Once the indication is received, the bypass valve ( ) may be closed, without the need for remedial action, by simply increasing the rate of fluid flow.