Patent ID: 7926574
Filing Date: 2011-04-19
Classification: E21B

Abstract:
1. An apparatus for diverting fluid flow out of a work string, the apparatus comprising: a housing having a central bore and at least one fluid port through the housing, the at least one fluid port communicating the central bore with an annulus; an upper piston operable for movement within the housing, wherein an increase in pressure moves the upper piston along the housing from an initial position to a second position; a middle piston operable for movement within the housing; a lower piston operable for movement within the housing, wherein the increase in pressure also moves the middle and lower pistons along the housing from the initial position to the second position; and a flow tube configured to prevent fluid communication between the central bore and the annulus in response to movement of the upper, middle, and lower pistons, wherein fluid communication between the central bore and the annulus, via the at least one fluid port, is achieved without the use of a port along the flow tube.