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US 5,509,356 AGranted
Liner and improved shaped charge especially for use in a well pipe perforating gun
AssigneeThe Ensign-Bickford Company
InventorSteven L. Renfro
Life of this patent
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AssigneeThe Ensign-Bickford Company
InventorSteven L. Renfro
Estimating the term…
A liner (30) for a shaped charge (10) has a hemispherical apex and a skirt portion (38) which terminates in a circular skirt edge (40) having a skirt edge diameter (D). The apex (36) has a radius of curvature which is less than the skirt edge diameter (D) and the thickness (Tac) of the liner at the center of the apex (36) is greater than the thickness (Ts) of the liner at the skirt edge (40), with the thickness tapering between the apex and the skirt edge in a smooth, curvilinear transition. The liner (30) may be employed in a shaped charge (10) which includes a shaped explosive (26) which has been compressed to at least 95% of its theoretical maximum density and is contained in a housing (12) and cover (20) made of a pulverable material such as a ceramic. A chamber (22) is provided in the base of the housing (12) to receive a pre-compressed initiation pellet (24) and the housing has a slot (42) formed in its base (14) to receive and retain therein a linear explosive member in close proximity to the initiation pellet (24) retained within the chamber.
A liner for a shaped charge, the liner having a convex outer surface, a concave inner surface, a closed end defining an apex having a center and a skirt portion terminating at an opposite, open end of the liner in a circular skirt edge having a skirt edge diameter, the apex having a radius of curvature which is from about 35% to 45% of the skirt edge diameter, and the thickness of the liner at the center of the apex is from about 5% to 50% greater than the thickness of the liner at the skirt edge, with the thickness of the liner between the apex and the skirt edge tapering in a smooth curvilinear transition between the apex and the skirt edge.
A shaped charge comprising a housing having an inner wall, an outer wall, a base and a mouth portion opposite the base;
Dependencies are inferred from the claim text.