Patent ID: 9353587
Filing Date: 2016-05-31
CPC Classification: E21B

Claim Text:
1. A flow sub for use with a drill string, comprising: a tubular housing having a longitudinal bore formed therethrough and a flow port formed through a wall thereof; a bore valve operable between an open position and a closed position, wherein the bore valve isolates an upper portion of the bore from a lower portion of the bore in the closed position; a sleeve disposed in the housing and movable between an open position where the flow port is exposed to the bore and a closed position where a wall of the sleeve isolates the flow port and the bore; and a bore valve actuator operably coupling the sleeve and the bore valve such that opening the sleeve closes the bore valve and closing the sleeve opens the bore valve, wherein the bore valve actuator is operable to close the bore valve after the sleeve is at least partially open and to open the bore valve before the sleeve is fully closed, and the sleeve is free from the bore valve actuator when the sleeve is in the closed position.