Surge immune liner setting tool

A method of hanging a tubular string from a liner string, casing string, or wellhead, comprising:

• running the tubular string into a wellbore using a deployment string and a deployment assembly,
• wherein the deployment assembly comprises a seat and a setting tool having:
• a debris barrier closing an upper end of the tubular string,
• a packoff sealing an interface between the setting tool and the tubular string,
• an actuator piston having an upper face in communication with a bore of the setting tool and a lower face in communication with the interface below the packoff,
• a latch releasably connecting the piston to the debris barrier and releasably connecting the debris barrier to the tubular string, and
• a packer actuator;
• pumping a setting plug to the seat, thereby operating the piston to set a hanger of the tubular string, wherein the latch releases the debris barrier from the actuator piston after setting the hanger;
• after setting the hanger, raising the setting tool from the tubular string, thereby operating the latch to release the debris barrier from the tubular string and extending the packer actuator against the upper end;
• and
• after raising the setting tool, setting weight on the packer actuator and upper end, thereby setting a packer of the tubular string.

A setting tool for hanging a tubular string from a liner string, casing string, or wellhead, comprising:

• a tubular mandrel having an actuation port formed through a wall thereof;
• a debris barrier for engaging an upper end of the tubular string;
• a latch for engaging a profile formed in an inner surface of the tubular string and operable to release the tubular string in response to a threshold force;
• a piston disposed along the mandrel, having an upper face in fluid communication with the actuation port, and operable to stroke the latch relative to the mandrel, thereby setting a hanger of the tubular string;
• and
• a packoff connected to the mandrel above the piston and operable to seal against the tubular mandrel and an inner surface of the tubular string, thereby forming a buffer chamber between the debris barrier and the packoff.