Radial-linear shaped charge pipe cutter

A shaped charge tubing cutter comprising a pair of substantially matched explosive units, each unit comprising a first explosive material that is formed intimately against a metallic liner, said liner being configured substantially about an axis of revolution, a first increment of said liner being configured substantially to the shape of a first conical frustum between a first normally truncated apex and a first normally truncated base, a second increment of said liner being configured substantially to the shape of a second conical frustum between a second normally truncated apex and a second normally truncated base, the truncated base of said first conical frustum being merged with the truncated apex of said second conical frustum, said first explosive material being substantially confined between said liner and a metallic end plate having a perimeter about said axis of revolution that substantially corresponds to a perimeter of said second truncated base, said units being joined coaxially at said first truncated apex with a first explosive material interface along a substantially common juncture plane.

A shaped charge tubing cutter comprising a pair of substantially matched explosive units, each unit comprising an explosive material that is formed intimately against a metallic liner, said liner being configured substantially about an axis of revolution with an outer surface conforming substantially to the shape of a first conical frustum extending axially between a normally truncated apex plane and a normally truncated base plane, said outer surface diverging from said apex plane at a first angle, an inner surface of said liner formed substantially to the shape of a second conical frustum diverging from said apex plane at a second angle, said second angle being greater than said first angle whereby a thickness of said liner between said outer surface and said inner surface is greater at said base plane than at said apex plane, said units being joined coaxially at said truncated apex plane with a first explosive material interface along a substantially common juncture plane.

A shaped charge tubing cutter comprising a pair of substantially matched explosive units, each unit comprising a first explosive material that is formed intimately against a metallic liner, said liner being configured substantially about an 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 substantially confined between said liner and a metallic end plate, said end plate having a perimeter about said axis of revolution that substantially corresponds to a perimeter of said truncated base, said units being joined coaxially at said truncated apex with a first explosive material interface along a substantially common juncture plane, an aperture perforating at least one end plate between respective outside and inside surfaces of said end plate, said inside surface being contiguous with said first explosive material, a column of second explosive material disposed within said aperture between said outside surface and a termination point at or before said common juncture plane.