Multipressure cycling valve for a toe port

Abstract

A multipressure cycling valve includes a top sub adapted to connect to a tubing string and a bottom sub adapted to connect to a toe port device; an outer valve housing connected to the top sub and the bottom sub; a rupture disc body comprising a rupture disc exposed to tubing string fluid pressure; a valve mechanism disposed between the valve housing and an annular valve sleeve, the valve mechanism comprising a plunger moveable from a closed position, to at least one intermediate closed position, to an open position, and an indexing mechanism which advances the plunger from the closed position to the at least one intermediate closed position by a first pressure event, and to the open position by a subsequent pressure event; a biasing means for urging the plunger towards its closed position; and wherein the valve defines a fluid communication path from the rupture disc body, through the plunger and the bottom sub to the toe port device, which fluid communication path is closed by a rupture disc and the plunger when closed.