Large-drift-diameter casing patching process pipe column and patching method

The invention discloses a large-drift-diameter casing patching process pipe column and a patching method, and the method comprises the following steps: carrying out drifting by using a full-size drifting process pipe column, and judging whether a casing is deformed or not or judging the deformation condition; patching the damaged casing pipe by using a large-drift-diameter casing pipe patching process pipe column; the large-drift-diameter casing patching process pipe column comprises an expansion pipe patching execution assembly, and the expansion pipe patching execution assembly comprises an adjusting center pipe, an anchor tile locking mechanism and a hydraulic cylinder mechanism; the anchor tile locking mechanism is arranged on the adjusting center pipe in a sleeving mode and used for fixing the expansion pipe to the inner wall of the sleeve in a clamped and locked mode. The hydraulic cylinder mechanism is arranged at the lower end of the adjusting center pipe, and the expansion pipe base pipe is fixed to