Patent ID: 7866391
Filing Date: 2011-01-11
Classification: E21B

Abstract:
1. A shoe for wellbore lining tubing, the shoe comprising: a tubular outer body adapted to be coupled to a wellbore lining tubing, the outer body having at least one flow port for fluid communication between the wellbore and an interior of the outer body; a tubular inner body located within the outer body and adapted to be coupled to fluid supply tubing located within the wellbore lining tubing, for the flow of fluid through the inner body into the wellbore; a generally annular flow area defined between the inner and outer bodies, the flow area in selective fluid communication with the wellbore through the flow port, for the return flow of fluid from the wellbore along the shoe and into an annulus defined between the wellbore lining tubing and the fluid supply tubing; and a valve assembly comprising an actuating member located within the inner body and defining a ball seat, a flow controller for selectively closing the flow port and a ball adapted to sealingly abut the valve seat; wherein the ball is adapted to be brought into abutment with the valve seat to prevent further fluid flow through the inner body into the wellbore, and whereupon exposure of the actuating member to fluid at a first fluid pressure causes the actuating member to move to an actuating position thereby moving the flow controller to close the flow port; and wherein the actuating member is movable to a further position on exposure to fluid at a second fluid pressure higher than said first pressure, where fluid flow from the inner body into the wellbore is reopened.