A method for producing a warhead with directed blasting action involves the step of making an outer casing and arranging therein a charge with a cavity situated at the front end of the charge. An insert whose shape corresponds to the shape of the cavity is arranged on the surface of the charge. The method furthermore involves the step of depositing a material on the insert in an additive manufacturing process. A warhead manufactured according to the method includes an outer casing, a charge with a cavity situated at the front end of the charge, and an insert. A material is deposited on the insert.

A perforating gun system with at least one gun. Each of the perforating guns have charges disposed in a gun carrier that are angled to the longitudinal axis of the gun to achieve a predetermined proppant transport profile into clusters within a stage in a well casing. The perforation tunnels may also have burrs on each side of the casing and acts in initially aiding proppant transport during fracture treatment. A method of tuning a cluster to achieve a desired fracturing treatment based on a feedback from another cluster includes selecting a hole diameter, a hole angle for creating an angled opening, a discharge coefficient, and a proppant efficiency. Moreover, a method of improving perforation charge efficiency.

A compact energetic-breaching apparatus is provided. The compact energetic-breaching apparatus is configured to receive energetic materials for use in energetic breaching. The compact energetic-breaching apparatus may comprise a housing body with a receptacle to receive energetic materials. The compact energetic-breaching apparatus may further comprise a tamping material. The compact energetic-breaching apparatus may further comprise a metal liner which collapses upon detonation to form a cutting jet.

The invention relates to a process for forming a pre-defined recess in a cured or cast explosive composition comprising the steps of: i) providing a female mould, ii) providing a male former, and locating said male former proximate to the female mould to create a gap between said male former and female mould, iii) forming an admixture of a curable/castable explosive composition, charging the gap with the admixture of explosive composition, causing the cure or cast of said curable/castable explosive composition, removing the male former to furnish a cured or cast explosive composition with a pre-defined recess.

Some embodiments are directed to a shaped charge liner including an apex end and a base end and defining a main liner axis that passes through the apex and base ends, the liner being rotationally symmetric about the main liner axis wherein the liner has discrete rotational symmetry about the main liner axis.

Some embodiments are directed to a shaped charge liner including an apex end and a base end and defining a main liner axis that passes through the apex and base ends, the liner being rotationally symmetric about the main liner axis wherein the liner has discrete rotational symmetry about the main liner axis.

The present invention relates to a liner for shaped charge for penetrating hard targets, wherein the liner comprises i) a carrier having a density below 9500 kg/m3; and ii) a coating deposited on said carrier comprising at least one metal and/or metal oxide, wherein the coating has a density greater than 10000 kg/m3; wherein the thickness ratio of the carrier to the coating ranges from 100:1 to 1:1, and wherein the oxygen content in the coating is less than 100 ppm atomic. The invention also relates to a method of producing such shaped charge liner and the use 0 thereof in a projectile for penetrating a hard military target.

The present invention relates to a liner for shaped charge for penetrating hard targets, wherein the liner comprises i) a carrier having a density below 9500 kg/m3; and ii) a coating deposited on said carrier comprising at least one metal and/or metal oxide, wherein the coating has a density greater than 10000 kg/m3; wherein the thickness ratio of the carrier to the coating ranges from 100:1 to 1:1, and wherein the oxygen content in the coating is less than 100 ppm atomic. The invention also relates to a method of producing such shaped charge liner and the use 0 thereof in a projectile for penetrating a hard military target.

An annular shaped-charge and blasting housing and a use method thereof are provided. The annular shaped-charge and blasting housing includes a PVC segment and multiple notch grooves. Grooves are notched on a W-shaped PVC segment formed by machining. The notching angle of the groove and the spacing distance between the grooves can be adjusted according to use requirements. And, the W-shaped PVC segment after being cut may not be limited to have eight notch grooves, and the number of the notch grooves of a single one PVC segment can be adjusted according to actual working conditions. The PVC segment can be folded and closed to form the annular shaped-charge and blasting housing. Therefore, the housing of the embodiments is simple in production, the linear segment can be bended and folded by utilizing the plasticity of the PVC material. The manufacturing process of the housing is simple and feasible. The housing of the embodiments is convenient to use and can meet the requirements of the annular shaped-charge cutting in blasting engineering. Meanwhile, the housing of the embodiments are widely applied. Further, the housing is not only applicable to annular shaped-charge cutting for the bottoms of holes to improve the planeness of the tunnel faces or the berm for the bench blasting, but also applicable to the cut blasting to improve the cut effect.

An annular shaped-charge and blasting housing and a use method thereof are provided. The annular shaped-charge and blasting housing includes a PVC segment and multiple notch grooves. Grooves are notched on a W-shaped PVC segment formed by machining. The notching angle of the groove and the spacing distance between the grooves can be adjusted according to use requirements. And, the W-shaped PVC segment after being cut may not be limited to have eight notch grooves, and the number of the notch grooves of a single one PVC segment can be adjusted according to actual working conditions. The PVC segment can be folded and closed to form the annular shaped-charge and blasting housing. Therefore, the housing of the embodiments is simple in production, the linear segment can be bended and folded by utilizing the plasticity of the PVC material. The manufacturing process of the housing is simple and feasible. The housing of the embodiments is convenient to use and can meet the requirements of the annular shaped-charge cutting in blasting engineering. Meanwhile, the housing of the embodiments are widely applied. Further, the housing is not only applicable to annular shaped-charge cutting for the bottoms of holes to improve the planeness of the tunnel faces or the berm for the bench blasting, but also applicable to the cut blasting to improve the cut effect.