METHOD AND APPARATUS FOR DROPPING A PUMP DOWN PLUG OR BALL

摘要

An improved method and apparatus for dropping a ball, plug or dart durin g oil and gas well operations (e.g., cementing operations) employs a specially configured valving member with curved and flat portions that alternatively direct fluid flow through a bore or opening in the valving member via an inner channel or around the peripher y of the valving member in an outer channel. In one embodiment, the ball(s), dart(s) or plug( s) are contained in a sliding sleeve that shifts position responsive to valve rotation.