Abstract: Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may include a rupture disc having a side surface that has a shallow angle taper inward towards a bottom surface of the rupture disc, and a mounting apparatus to support the rupture disc so that the rupture disc forms the temporary seal. When a disc working pressure is applied to a top surface of the rupture disc, engagement/force transmission between the rupture disc and the mounting apparatus produces enough radial compression in the rupture disc due to the shallow angle taper to significantly mitigate or cancel tensile stresses thereby avoiding the rupture disc from breaking. The rupture disc may be configured to break when the rupture disc is subjected to a disc working pressure that is greater than the disc rupture pressure, thereby removing the temporary seal.

Abstract: Disclosed is a rupture disc assembly for use in making a temporary seal in a vessel such as a casing string. The rupture disc assembly may generally include (A) a rupture disc having a side surface having a shallow taper inward towards a bottom surface of the rupture disc (B) an actuating mechanism including (i) an outer sled having an inner supporting surface forming a taper complimentary to the shallow taper of the side surface, (ii) an inner sled disposed within the outer sled and having a support shoulder to support the bottom surface of the rupture disc and (iii) a securing mechanism and (C) a housing to house the rupture disc and actuating mechanism.