Patent ID: 7661367

Claim:
A shaped charge tubing cutter comprising: a first explosive unit and a second explosive unit that are substantially matched, the first unit and the second unit each being a single unitary part extending substantially about an axis of revolution, the first unit comprising an first explosive material that is formed intimately against a first metallic liner, said first metallic liner being configured substantially about the axis of revolution substantially to the shape of a conical frustum between a normally truncated apex and a normally truncated base, said first explosive material being between said first liner and a first metallic end plate having a perimeter about said axis of revolution that substantially corresponds to a perimeter of said truncated base, the second unit comprising an first explosive material that is formed intimately against a second metallic liner, said second metallic liner being configured substantially about the axis of revolution substantially to the shape of a conical frustum between a normally truncated apex and a normally truncated base, said first explosive material being between said second liner and a second metallic end plate having a perimeter about said axis of revolution that substantially corresponds to a perimeter of said truncated base; said first unit and said second unit are joined coaxially with one another at each said respective truncated apex, a first explosive material interface being between the explosive of the first unit and the first explosive of the second unit, and being along a substantially common juncture plane between the first unit and the second unit, an aperture perforates the first end plate along said axis of revolution between said outside and inside surfaces of said first end plate, said inside surface of said first end plate being contiguous with said first explosive material of said first unit, a first column of second explosive material fills said aperture between said outside and inside surfaces of the first end plate, an aperture perforates the second end plate along said axis of revolution between said outside and inside surface of said second end plate, said inside surface of said second end plate being contiguous with said first explosive material of said second unit, a second column of second explosive material fills said aperture between said outside and inside surfaces of the second end plate, wherein said first column of second explosive material and said second column of second explosive material are separate from one another and each terminate proximate of each respective said inside surface of each respective; and the explosive of the first unit against a first metallic liner and the explosive of the second unit against the second metallic liner extend between and separate the first column of explosive from the second column of explosive.