Abstract: An explosive pellet for characterizing a fracture in a subterranean formation is provided. The pellet can include a casing having a detonation material and an explosive material disposed within the casing. The pellet can also include a nonexplosive material moveably disposed within the casing. Movement of the nonexplosive material can generate a predetermined amount of energy in the form of friction-generated heat sufficient to detonate the explosive material.

Abstract: An explosive pellet for characterizing a fracture in a subterranean formation is provided. The pellet can include a casing having a detonation material and an explosive material disposed within the casing. The pellet can also include a nonexplosive material moveably disposed within the casing. Movement of the nonexplosive material can generate a predetermined amount of energy in the form of friction-generated heat sufficient to detonate the explosive material.

Abstract: A downhole device having an explosive component includes a high temperature stable explosive having thermal stability greater than 200° C.

Abstract: An explosive package is provided for use in seismic exploration which comprises a seismic charge and an addressable switch for selecting that seismic charge for detonation. A fireset is operatively coupled to the addressable switch for receiving a firing voltage via the addressable switch and for producing an actuation voltage. The actuation voltage may, for example be produced by increasing the magnitude of the firing voltage. The actuation voltage is provided to a Detonating Device, which is a device that contains secondary explosives. Examples of a Detonating Device include an exploding bridge wire detonator, an exploding foil initiator detonator and a semiconductor bridge slapper device. Such explosive packages may be arranged in a system for use in seismic exploration which comprises a base unit for providing selection, firing and trigger signals and a plurality of explosive packages that are located at spaced intervals along the earth's surface.

Abstract: A perforating apparatus that is usable with a well includes a shaped charge. The shaped charge includes a case, an explosive and a liner. The liner is adapted to form a perforation jet to form a perforation tunnel and promote an exothermic reaction inside the tunnel to create a pressure wave to force debris from the tunnel.

Abstract: A detonating device includes a high explosive portion comprising high explosive; a low explosive portion comprising low explosive; and a transition portion between the high explosive portion and the low explosive portion, wherein the transition portion comprises a mixture of high explosive and low explosive.

Abstract: A detonating device includes a high explosive portion comprising high explosive; a low explosive portion comprising low explosive; and a transition portion between the high explosive portion and the low explosive portion, wherein the transition portion comprises a mixture of high explosive and low explosive.

Abstract: A perforating charge for use in a wellbore includes an explosive and a liner to be collapsed by detonation of the explosive. The liner includes at least a first liner portion and a second liner portion which have different cohesiveness.

Abstract: A perforating apparatus that is usable with a well includes a shaped charge. The shaped charge includes a case, an explosive and a liner. The liner is adapted to form a perforation jet to form a perforation tunnel and promote an exothermic reaction inside the tunnel to create a pressure wave to force debris from the tunnel.

Abstract: A perforating charge for use in a wellbore includes an explosive and a liner to be collapsed by detonation of the explosive. The liner includes at least a first liner portion and a second liner portion which have different cohesiveness.

Abstract: A perforating charge for use in a wellbore includes an explosive and a liner to be collapsed by detonation of the explosive. The liner includes at least a first liner portion and a second liner portion which have different cohesiveness.

Abstract: A perforating charge for use in a wellbore includes an explosive and a liner to be collapsed by detonation of the explosive. The liner includes at least a first liner portion and a second liner portion which have different cohesiveness.

Abstract: A downhole device having an explosive component includes a high temperature stable explosive having thermal stability greater than 200° C.

Abstract: A tool for use in a wellbore has an activation assembly, which has a support structure and a reactive layer on the support structure. The reactive layer is formed of a pyrotechnic material. The activation assembly also includes an electrically conductive protective layer covering the reactive layer to protect the reactive layer from electrical discharge. The tool further includes a component to be activated by the activation assembly.

Abstract: A propellant assembly for fracturing a formation around a well includes a propellant and a detonating cord wrapped around the propellant, the detonating cord to ignite the propellant upon detonation of the detonating cord. Alternatively, the propellant can include a substantially central axial bore, with the propellant having a plurality of axial slots extending radially outwardly from the axial bore toward the outer surface of the propellant. A detonating cord is arranged within the axial bore of the propellant.

Abstract: A method for perforating a wellbore comprises placing a perforating device in a cased wellbore that passes through a subterranean formation. The perforating device comprises at least one explosive perforating charge that can be detonated in order to perforate the casing and allow the formation fluids to enter the wellbore. A perforating fluid is placed in the wellbore between the perforating device and the casing. The ratio of the critical temperature of the perforating fluid in ° K and the temperature of the subterranean formation adjacent to the casing in ° K is between about 1.0-1.3. When the at least one explosive charge in the perforating device is detonated, at least one perforation is formed in the casing, and at least a portion of the perforating fluid is forced into the subterranean formation.

Abstract: A tool for use in a wellbore has an activation assembly, which has a support structure and a reactive layer on the support structure. The reactive layer is formed of a pyrotechnic material. The activation assembly also includes an electrically conductive protective layer covering the reactive layer to protect the reactive layer from electrical discharge. The tool further includes a component to be activated by the activation assembly.

Abstract: A perforating charge for use in a wellbore includes an explosive and a liner to be collapsed by detonation of the explosive. The liner includes at least a first liner portion and a second liner portion which have different cohesiveness.

Abstract: A perforating gun and method of manufacture is provided for downhole perforation operations in a wellbore. The perforating gun includes tubular components fabricated from a multi-layer metallic/intermetallic laminate material. For example, the perforating gun may include a tubular gun carrier and/or loading tube fabricated from a multi-layers of two different metals (e.g., iron and aluminum) bonded together to form an intermetallic laminate.

Abstract: A method for perforating a wellbore comprises placing a perforating device in a cased wellbore that passes through a subterranean formation. The perforating device comprises at least one explosive perforating charge that can be detonated in order to perforate the casing and allow the formation fluids to enter the wellbore. A perforating fluid is placed in the wellbore between the perforating device and the casing. The ratio of the critical temperature of the perforating fluid in ° K and the temperature of the subterranean formation adjacent to the casing in ° K is between about 1.0-1.3. When the at least one explosive charge in the perforating device is detonated, at least one perforation is formed in the casing, and at least a portion of the perforating fluid is forced into the subterranean formation.