Patent ID: 8474473

Claim:
A method of hot tapping into a multiple string configuration for obtaining access to production tubing, comprising the following steps: a. providing a multiple casing string that includes at least an outer casing and an inner casing or production string; b. mounting a clamp assembly around a wall of the outer casing; c. hot tapping an opening through the outer casing wall to capture any pressurized fluid through the opening; d. cutting first and second openings through the wall of the outer casing to access the inner casing; e. through the first opening, drilling a hole through a wall of the inner casing to capture any pressurized fluid through the opening in the inner casing; and f. inserting an anvil through the second opening to contact and stabilize the wall of the inner casing to prevent the casing from moving while the casing is drilled in step (e).