Drill string flow control valves and methods

Details Drill string flow control valves and methods Drill string flow control valves and methods

2009-04-29

2011-11-29

Neuder, William P (Department: 3676)

Wells

Processes

Placing or shifting well part

C166S321000, C175S243000, C175S318000

Reexamination Certificate

active

08066079

ABSTRACT:
Drill string flow control valves and more particularly, drill string flow control valves for prevention of u-tubing of fluid flow in drill strings are provided. Drill string flow control valves may comprise a valve housing, a valve sleeve axially movable within a valve housing from a closed position to an open position, a piston axially movable within said valve housing and bearing against the valve sleeve, a biasing mechanism for biasing the valve sleeve into the closed position, a static pressure port for actuating said piston utilizing internal fluid pressure within said valve and a plurality of dynamic pressure ports for allowing a differential pressure to be exerted on the valve sleeve during dynamic flow conditions. The differential pressure exerted on the valve sleeve may be the result of an upstream pressure and a downstream pressure during fluid flow through said valve. By allowing a differential pressure resulting from a fluid flow to act on the valve sleeve, u-tubing in a drill string can be prevented or substantially reduced. Methods of use are also provided.

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International Search Report dated Nov. 3, 2010 issued in WO/2010/127107.

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