Abstract: A burst plug assembly for use in the fluid port of tubular fracturing tools to provide erosion resistance. The assembly has a body with an annular side wall and a closing wall closing the central bore of the annular side wall. A choke insert is retained in the central bore of the body to line the inner surface of the central bore. A groove in a face of the closing wall circumscribes a core in the bottom wall, and is sized and located so that a largest dimension of the core is no greater than a diameter of the inner bore of the choke insert, such that when a prescribed threshold hydraulic pressure level of the treatment fluid is applied to the closing wall the core disengages from the closing wall along the groove in a bursting action and passes through the inner bore of the choke insert.

Abstract: A fracturing tool is used for hydraulically fracturing multiple stages of a well bore with treatment fluid. The tool includes a tubular housing retaining a longitudinally sliding sleeve which moves between a first position concealing fluid ports in the tubular housing and a second position in which the ports are uncovered. A deformable seat disposed in the sliding sleeve cooperates with an actuating member which is directed downwardly through a fracturing string locating a plurality of tools therein associated with respective stages of an isolated zone to sequentially uncover the fluid ports. Disposed in the fluid ports are burst plugs arranged to open when exposed to a threshold pressure. All uncovered burst plugs of the tools within the isolated zone can thus be sequentially uncovered and then opened when exposed to the threshold pressure to permit the treatment fluid to exit from the housing into the surrounding well bore.