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US 6,021,714 AGranted
Shaped charges having reduced slug creation
AssigneeSchlumberger Technology Corporation
InventorsBrenden M. Grove, Jack F. Lands, Jr., Robert A. Parrott
Life of this patent
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Abstract
A shaped charge for use in perforating formation adjacent a wellbore includes a liner having a substantially non-conical shape (also referred to as bowl-shaped). The liner has first and second layers, with a first layer contacting the main explosive charge. The second layer (made of such materials as copper, silver, gold, and so forth) contributes primarily to formation of a perforating jet while the first layer contains a material that substantially disintegrates upon detonation such that formation of a slug is reduced or eliminated.
Claims14
A shaped charge, comprising:
- a case;
- an explosive charge contained in the case;
- and
- a liner having a substantial portion that is generally bowl-shaped, wherein the liner includes a first layer of a first material and a second layer of a second, different material, the first layer having a portion with a first thickness and the second layer having a portion with a second thickness, the first layer positioned between the explosive charge and the second layer, the first thickness to second thickness ratio being less than about 3:1 and greater than about 1:3, and the first layer having a low temperature melting point such that upon detonation the first layer substantially disintegrates to reduce slug formation,
- wherein the bowl-shaped liner has a shape selected from the group consisting of generally parabolic, generally hemispherical, and tulip-shape;
- and
- wherein the first material is selected from the group consisting of zinc, lead, tin, a particulated metal, a metal alloy, plastic, nylon, and epoxy.
4 more elements
A shaped charge, comprising:
- a case,
- an explosive charge contained in the case;
- and
- a liner having a substantial portion that is generally bowl-shaped, wherein the liner includes a first layer of a first material and a second layer of a second, different material, the first layer having a portion with a first thickness and the second layer having a portion with a second thickness, the first layer positioned between the explosive charge and the second layer, the first thickness to second thickness ratio being less than about 3:1 and greater than about 1:3, and the first layer having a low temperature melting point such that upon detonation the first layer substantially disintegrates to reduce slug formation,
- wherein the first material includes a material selected from the group consisting of plastic, nylon, and epoxy.
2 more elements
A shaped charge comprising:
- a case;
- an explosive contained in the case;
- and
- a liner having a substantial portion that is generally bowl-shaped and having a first layer of a first thickness and a second layer of a second thickness, the first layer being positioned between the explosive and the second layer and formed of a material that substantially disintegrates upon detonation,
- the first thickness and the second thickness having a relative ratio selected from a range defined between about 3:1 and 1:3,
- wherein the bowl-shaped liner has a shape selected from the group consisting of generally parabolic, generally hemispherical, and tulip-shape;
- and
- wherein the first material is selected from the group consisting of zinc, lead, tin, a particulated metal a metal alloy, plastic, nylon, and epoxy.
5 more elements
A shaped charge comprising:
- a case;
- an explosive contained in the case;
- and
- a liner that is generally bowl-shaped and having at least two layers, an inner layer to contribute to formation of a perforating jet and an outer layer that substantially disintegrates to reduce slug formation upon detonation, the liner having a portion with a total thickness and the inner layer having a portion with a thickness that is greater than about 25% of the total thickness,
- wherein the bowl-shaped liner has a shape selected from the group consisting of generally parabolic, generally hemispherical, and tulip-shape;
- and
- wherein the outer layer is formed of material selected from the group consisting of zinc, lead, tin, a particulated metal, a metal alloy, plastic, nylon, and epoxy.
4 more elements
A shaped charge comprising:
- a case;
- an explosive contained in the case;
- and
- a liner having a substantial portion that is generally bowl-shaped and having a first layer of a first thickness and a second layer of a second thickness, the first layer being positioned between the explosive and the second layer and formed of a material that substantially disintegrates upon detonation,
- the first thickness and the second thickness having a relative ratio selected from a range defined between about 3:1 and 1:3,
- wherein the first material is selected from the group consisting of plastic, nylon, and epoxy.
3 more elements
A shaped charge comprising:
- a case;
- an explosive contained in the case;
- and
- a liner that is generally bowl-shaped and having at least two layers, an inner layer to contribute to formation of a perforating jet and an outer layer that substantially disintegrates to reduce slug formation upon detonation, the liner having a portion with a total thickness and the inner layer having a portion with a thickness that is greater than about 25% of the total thickness,
- wherein the outer layer is formed of a material selected from the group consisting of plastic, nylon, and epoxy.
2 more elements
Dependencies are inferred from the claim text.