Hydrostatically powered fracturing sliding sleeve

摘要

A series of sliding sleeves is actuated by a single ball that lands on a first ball seat and shifts the ball seat. The shifting of the ball seat also allows tubing pressure to communicate to a formerly atmospheric chamber on one side of a piston integrated into the back side of the sliding sleeve. The other side of the piston remains at atmospheric pressure so that the shifting of the ball seat not only releases the ball to go to the next ball seat but also puts a net force on the sliding sleeve to shift it against a travel stop to open a port to allow fracturing, even if there is cement in the annulus around the opened port.

主权项

1. A completion assembly for subterranean use, comprising:
a tubular housing having a plurality of axially spaced ports each associated with a sliding sleeve valve such that said sliding sleeve valves are axially spaced from each other; said sliding sleeve valves further comprising a movable seat responsive to a fluid pressure to a predetermined value on an object that sequentially lands on said seats; individual movement of one of said movable seats redirects at least a portion of said fluid pressure to release a boost force to act on a respective said sliding sleeve valve associated with said moving movable seat, to shift said associated sliding sleeve valve and release the object to the adjacent said seat that has yet to shift.