Sealing system and method

A method of selectively sealing a portion of a wellbore, comprising the steps of:

• a) providing a sealing system comprising:
• a housing including a housing inner bore, the housing configured for direct axial connection to a distal end of a coiled tubing string or a drill pipe string;
• a rupture disc disposed within the housing inner bore, the rupture disc including a base and a central portion, wherein the central portion extends entirely across the housing inner bore and fluidly seals the housing inner bore in a sealed state;
• a sleeve disposed within the housing inner bore, the sleeve including a sleeve central bore and a downstream retainer adjacent to the sleeve central bore;
• and a plug retained within the sleeve central bore to fluidly seal the housing inner bore in the sealed state;
• wherein the sleeve is disposed an axial distance from the rupture disc;
• b) positioning the rupture disc system in the sealed state within the wellbore to fluidly seal the portion of the wellbore;
• c) generating a release event to release the plug from the sleeve central bore;
• wherein the plug travels downstream into an intermediate space between the sleeve and the rupture disc;
• d) triggering a rupture event to fracture the central portion of the rupture disc into a plurality of fragments;
• e) optionally clearing the plurality of fragments of the rupture disc from the housing central bore with the plug.