Plug release in a subterranean well

A method for use with a subterranean well, the method comprising:

• connecting at least first and second plug release tools and at least first and second well tools in a tubular string;
• deploying a first plug into the tubular string, thereby releasing a second plug from the first plug release tool;
• and
• deploying a third plug into the tubular string, thereby releasing a fourth plug from the second plug release tool.

A plug release tool for use in a subterranean well, the plug release tool comprising:

• an outer housing having a fluid inlet and a fluid outlet;
• first and second parallel flow passages configured to permit fluid flow from the fluid inlet to the fluid outlet;
• a piston releasably secured against displacement in the outer housing, the piston having the first flow passage therein;
• a first plug configured to block fluid flow through the first flow passage;
• and
• a second plug configured to be released from the second flow passage in response to displacement of the piston relative to the outer housing.