Abstract: A method and apparatus are provided for controlling wellbore pressure within a wellbore during a perforation event by changing a state of a valve system multiple times. Information generated about the wellbore pressure within the wellbore may be received. A state of the valve system, which is positioned relative to a chamber within the wellbore, may be changed multiple times based on the information received to create a plurality of pressure conditions that substantially match a reference pressure profile. Each of the plurality of pressure conditions is selected from one of an underbalance condition and an overbalance condition.

Abstract: Provided is a downhole perforating device, a well system, and a method for perforating a well system. The downhole perforating device, in one aspect, includes a perforating structure for surrounding at least a portion of an outer surface of a wellbore casing. The downhole perforating device, according to this aspect, includes one or more perforation elements at least partially embodied within the perforating structure, the one or more perforation elements positioned to perforate the wellbore casing to an inside thereof, and electronics at least partially embodied within the perforating structure, the electronics for triggering the one or more perforation elements.

Abstract: Provided is an untethered downhole tool assembly. The untethered downhole tool assembly, in one aspect, includes a housing and a signal generator located on or in the housing, the signal generator capable of transmitting a passive or active signal to a downhole device located on an outside of a metal wellbore casing as it travels through an inside of the metal wellbore casing.

Abstract: Electrically ignitable and electrically controllable explosive material (EIECEM) may be disposed within a shaped charge for deployment downhole. An explosion of the EIECEM is controlled by limiting the duration of excitation at the EIECEM, for example, the duration that an electrical source provides an electrical charge, electrical current or electrical signal. The shaped charge may be insulated from an electrical source to prevent explosion of the EIECEM and coupled to the electrical source to create ignite or explode the EIECEM. A plurality of shaped charges may be disposed downhole and may be ignited or exploded in any suitable order. The EIECEM may be ignited multiple times such that multiple explosions are created. The explosion of the EIECEM creates or extends a perforation or fracture in a formation. The shaped charges may be arranged to create a shaped perforation or fracture, such as a slot-shaped fracture.

Abstract: A system and method to control wellbore pressure during perforating. The system comprises a carrier, a sensor, a pressure-altering device, and a processor in communication with the sensor. The sensor is configured to detect a stress wave propagating through the carrier before the arrival of a related pressure wave in the wellbore and generate a signal indicative of the detected stress wave. The pressure-altering device is actuatable to change the pressure in the wellbore. The processor is operable to analyze the signal from the sensor and control the pressure-altering device based on the detected stress wave to change the magnitude of the related pressure wave in the wellbore.

Abstract: The disclosure relates to perforating systems for perforating the casing of a wellbore. The perforating systems contain insensitive high explosives. The disclosure also relates to shaped charges containing insensitive high explosives for use in such perforating systems.

Abstract: An initiator comprises: a first explosive substance, wherein the first explosive substance comprises a secondary explosive, and wherein at least the first explosive substance is capable of being initiated. The initiator comprises effectively no primary explosive. The secondary explosive can be a thermally-stable secondary explosive. A method of using an initiator comprises: initiating the initiator.

Abstract: The disclosure relates to perforating systems for perforating the casing of a wellbore. The perforating systems contain insensitive high explosives. The disclosure also relates to shaped charges containing insensitive high explosives for use in such perforating systems. The disclosure further relates to methods of using such perforating systems to perforate the casing of a wellbore.

Abstract: Systems and methods for downhole perforation. A method may comprise lowering a downhole perforating system into a casing of a wellbore, wherein the downhole perforating system may comprise 1,1-diamino 2,2-dinitroethylene; detonating the 1,1-diamino 2,2-dinitroethylene; and perforating the casing. A downhole perforating system may comprise a firing head subassembly, a gun subassembly and an explosive component comprising 1,1-diamino 2,2-dinitroethylene.

Abstract: A method and apparatus are provided for controlling wellbore pressure within a wellbore during a perforation event by changing a state of a valve system multiple times. Information generated about the wellbore pressure within the wellbore may be received. A state of the valve system, which is positioned relative to a chamber within the wellbore, may be changed multiple times based on the information received to create a plurality of pressure conditions that substantially match a reference pressure profile. Each of the plurality of pressure conditions is selected from one of an underbalance condition and an overbalance condition.

Abstract: The disclosure relates to perforating systems for perforating the casing of a wellbore. The perforating systems contain insensitive high explosives. The disclosure also relates to shaped charges containing insensitive high explosives for use in such perforating systems. The disclosure further relates to methods of using such perforating systems to perforate the casing of a wellbore.

Abstract: The disclosure relates to perforating systems for perforating the casing of a wellbore. The perforating systems contain insensitive high explosives. The disclosure also relates to shaped charges containing insensitive high explosives for use in such perforating systems.

Abstract: Disclosed is a method and apparatus for use in initiating explosives used in application including well perforating systems. The initiator uses an air gap separating an electrically triggered semiconductor bridge plasma energy creator and a reactive foil abutting an explosive.

Abstract: An initiator comprises: a first explosive substance, wherein the first explosive substance comprises a secondary explosive, and wherein at least the first explosive substance is capable of being initiated. The initiator comprises effectively no primary explosive. The secondary explosive can be a thermally-stable secondary explosive. A method of using an initiator comprises: initiating the initiator.

Abstract: A liner (18) for a shaped-charge (10) that is compressively formed from a mixture of powdered metal, powdered metal binder, and a selected quantity of nanoparticle material, is used to achieve improved penetration depths during perforation of a wellbore. Exemplary nanoparticles include lead, tin, copper, molybdenum, etc. Such nanoparticles increase the density, sound speed, or acoustic impedance of the liner. In another embodiment, the added nanoparticles comprise reactive materials which, after penetration into the formation, cause secondary reactions in the perforations.

Abstract: Disclosed is a method and apparatus for use in initiating explosives used in application including well perforating systems. The initiator uses an air gap separating an electrically triggered semiconductor bridge plasma energy creator and a reactive foil abutting an explosive.

Abstract: Disclosed is a method and apparatus for use in initiating explosives used in application including well perforating systems. The initiator uses an air gap separating an electrically triggered semiconductor bridge plasma energy creator and a reactive foil abutting an explosive.

Abstract: Disclosed is a method and apparatus for use in initiating explosives used in application including well perforating systems. The initiator uses an air gap separating an electrically triggered semiconductor bridge plasma energy creator and a reactive foil abutting an explosive.

Abstract: A perforating gun assembly for use in a wellbore. The perforating gun assembly includes a carrier gun body and a charge holder disposed within the carrier gun body. A plurality of shaped charges are supported within the carrier gun body. A secondary pressure generator is operably associated with at least one of the shaped charges. The secondary pressure generator optimizes the wellbore pressure regime immediately after detonation of the shaped charges by controlling the dynamic underbalance created by the empty gun chambers to prevent excessive dynamic underbalance which may detrimentally effect the perforating operation.

Abstract: A perforating gun assembly for use in a wellbore. The perforating gun assembly includes a carrier gun body and a charge holder disposed within the carrier gun body. A plurality of shaped charges are supported within the carrier gun body. A secondary pressure generator is operably associated with at least one of the shaped charges. The secondary pressure generator optimizes the wellbore pressure regime immediately after detonation of the shaped charges by controlling the dynamic underbalance created by the empty gun chambers to prevent excessive dynamic underbalance which may detrimentally effect the perforating operation.