Method for setting a frac plug with a tubular metal seal

A method, comprising:

• deploying a plug assembly into a casing within a drilled hole, the plug assembly comprising a tubular metal seal having an interior, an exterior, a sidewall extending between the interior and the exterior, a proximal end, a distal end, and a length extending between the proximal end and the distal end, the interior at the proximal end having a tapered interior portion extending inwardly toward the distal end along the length;
• deploying a setting tool into the casing within the drilled hole, the setting tool having a first end having a tapered exterior portion;
• expanding the tubular metal seal radially to a first radial diameter with the setting tool by moving the setting tool longitudinally such that the tapered exterior portion of the first end of the setting tool engages the tapered interior portion of the proximal end of the tubular metal seal;
• and
• removing the setting tool from the casing.