Systems and methods for wellbore liner installation under managed pressure conditions

A system for installing a casing within a borehole, the system comprising:

• a wellhead assembly disposed at an upper end of the borehole and fluidly coupled to the borehole;
• a pump fluidly coupled to the wellhead assembly;
• and
• a casing installation assembly configured to be inserted through the wellhead assembly and into the borehole, wherein the casing installation assembly comprises:
• a tubular string;
• an isolation sub coupled to a downhole end of the tubular string;
• a diverter sub coupled to and positioned downhole of the isolation sub;
• and
• a landing string coupled to the diverter sub and configured to be coupled to the casing,
• wherein the isolation sub comprises a valve assembly that is configured to selectively prevent fluid communication between the tubular string and the diverter sub, wherein the valve assembly has an open position configured to permit fluid communication between the tubular string and the diverter sub and a closed position configured to prevent fluid communication between the tubular string and the diverter sub;
• wherein the pump is configured to circulate a fluid from the pump through an inlet in fluid communication with the wellhead assembly and circulate the fluid from an outlet in fluid communication with the wellhead assembly to the pump with the valve assembly in the closed position to manage a pressure in the wellhead assembly and the upper end of the borehole.