PILOT INSIDE A BALL SUITABLE FOR WELLBORE OPERATIONS.

摘要

An apparatus, system, and method enable control of fluid flow in a drilling or casing string. The apparatus comprises a pusher rod, with a bore for fluid flow, contacting a rotatable ball with an internal bore comprising at least one pilot, wherein the seat between the pusher rod and the interior of the tubular prevents fluid flow. Pressure changes on the pusher rod rotate the bore of the ball in and out of contact with the bore of the pusher rod, to enable or prevent fluid flow, respectively. A method of use opens the ball by exerting pressure on the pusher rod to enable flow, and stops flow through pressure exerted on the bottom of the ball, causing the ball to rotate the exterior surface to the internal bore of the pusher rod. An accumulator can control operation of the valve by selectively exerting fluid pressure on the pusher rod.