Method of direct hot tapping into a multiple production string without removing outer layers of casing

A method of hot tapping into a multiple production string to obtain access tubing within the multiple string, without removing outer layers of casing, comprising the following steps:

• a. mounting a clamp assembly, comprising front and rear clamps around a wall of the outer casing, each front and rear clamps having an access window to the outer casing wall;
• b. mounting a hot tap drilling assembly to the front clamp access window for hot tapping an opening through the outer casing wall to capture any pressurized fluid through the opening;
• c. after removing the hot tap drilling assembly, through each of the access windows, cutting two openings through the wall of the outer casing to access a next layer of inner casing;
• d. inserting an anvil through the opening in the rear clamp to rest against and stabilize the wall of the inner casing to prevent the casing from moving;
• e. through the front clamp access opening, drilling a hole through a wall of the inner casing while the inner casing is stabilized by the anvil to capture any pressurized fluid through the opening in the inner casing;
• and
• f. repeating steps (c) through (f) for all layers of inner casing or production strings.

A method of hot tapping into a multiple string configuration without removing outer layers of casing to obtain access to the production tubing and by stabilizing inner strings of tubing, wherein there is provided a multiple casing string that includes at least an outer casing and an inner casing or production string;

• a clamp assembly mounted around a wall of the outer casing, an opening hot tapped through the outer casing wall to capture any pressurized fluid through the opening;
• the method comprising the following steps:
• a. cutting a first and second opening through the wall of the outer casing to access the inner casing;
• b. inserting an anvil through the second opening to contact and stabilize a wall of the inner casing to prevent the casing from moving when the inner casing is hot tapped;
• c. through the first opening, drilling a hole through the wall of the inner casing while the inner casing is stabilized to capture any pressurized fluid through the opening in the inner casing;
• and
• d. repeating steps (a) through (c) for all other casings or production strings contained within the outer casing.