The present invention relates to a device, a system and a method for retaining detonators in an explosive booster, particularly a retention device for retaining a detonator in the blind hole of a booster which allows the safe extraction thereof from the booster. The retention device comprises a flexible holding means that is movable between a blocking position retaining the detonator inside the blind hole and an open position which allows extracting the detonator from the blind hole.

The present invention relates to a device, a system and a method for retaining detonators in an explosive booster, particularly a retention device for retaining a detonator in the blind hole of a booster which allows the safe extraction thereof from the booster. The retention device comprises a flexible holding means that is movable between a blocking position retaining the detonator inside the blind hole and an open position which allows extracting the detonator from the blind hole.

A power charge and method for actuating a wellbore tool with a power charge. The power charge may include a first volume containing a first energetic material and a second volume containing a second energetic material positioned within the first energetic material. The second energetic material may be a faster burning material compared to the first energetic material. The wellbore tool may include a power charge cavity, an initiator positioned in an initiator holder adjacent to the power charge within the power charge cavity, and a gas diverter channel for directing to an expansion chamber gas pressure generated by combustion of the power charge, to actuate the wellbore tool. The method may include inserting the initiator into the intiator holder within the power charge cavity and initiating combustion of the first energetic material and the second energetic material.

A power charge and method for actuating a wellbore tool with a power charge. The power charge may include a first volume containing a first energetic material and a second volume containing a second energetic material positioned within the first energetic material. The second energetic material may be a faster burning material compared to the first energetic material. The wellbore tool may include a power charge cavity, an initiator positioned in an initiator holder adjacent to the power charge within the power charge cavity, and a gas diverter channel for directing to an expansion chamber gas pressure generated by combustion of the power charge, to actuate the wellbore tool. The method may include inserting the initiator into the intiator holder within the power charge cavity and initiating combustion of the first energetic material and the second energetic material.

A perforating gun assembly may include a housing extending along a first axis, a movable structure provided within the housing, and a tool string component coupled to the housing and abutting the moveable structure. The movable structure may be movable between a first position along the first axis relative to the housing and a second position along the first axis relative to the housing.

A perforating gun assembly may include a housing extending along a first axis, a movable structure provided within the housing, and a tool string component coupled to the housing and abutting the moveable structure. The movable structure may be movable between a first position along the first axis relative to the housing and a second position along the first axis relative to the housing.

The present invention provides an explosive method that improves on methods currently employed. The present invention provides for a safer, less expensive, and more portable explosive device. The elements of the present invention replace dynamite or similar explosives currently used in avalanche control and bore hole blasting of rock or other solids. The present invention comprises an apparatus and a method providing a much safer alternative employing a highly confined combustion reaction of a flammable vapor, whereas dynamite is a category 1.1 high explosive imbued with all the attendant safety and security concerns. The method of the present invention provides for an improved and safer method of blasting employing a highly confined combustion reaction of a flammable vapor instead of conventional explosives currently used.

An explosive initiator retention assembly comprises a pair of opposed shell elements. The shell elements have a pair of spaced-apart passages, each configured to receive an elongated initiator having a cylindrical form. Each passage has a rotation inhibitor element configured to rotationally engage an initiator, such the initiators are retained against rotation.

An explosive initiator retention assembly comprises a pair of opposed shell elements. The shell elements have a pair of spaced-apart passages, each configured to receive an elongated initiator having a cylindrical form. Each passage has a rotation inhibitor element configured to rotationally engage an initiator, such the initiators are retained against rotation.

An initiator head assembly may include a body and an electrical contact component positioned proximal to the body. The body may include a head extending from a base, and a platform extending from the head, and the body may be injection molded as a unitary component. The electrical contact component may include a line-in portion positioned proximal to the platform and a ground portion positioned proximal to the head. The electrical contact component may be formed integrally with the body such that it is anchored in a fixed position in the body. An initiator for a perforating gun assembly may include the initiator head assembly and a shell coupled to the initiator head assembly.