Abstract: Embodiments of the present disclosure include a method for fabricating a perforating gun including forming an expendable hollow carrier (EHC) via a drawing process. The method also includes determining a wall thickness of the EHC is above a threshold. The method includes machining a coupling component to at least one end of the EHC. The method further includes installing perforating components within an interior of the EHC.

Abstract: A perforating gun assembly for use in a wellbore includes a carrier body and a charge holder disposed within the carrier body. One or more shaped charges are supported by the carrier body and are operably coupled to a detonator for igniting a highly explosive material within the each of the shaped charges. At least one solid propellant tablet is also disposed within the carrier body and is operably coupled to the detonator to ignite and burn immediately after detonation of the shaped charges. The solid propellant tablet burns or is consumed in such a manner to effectively mitigate or control the dynamic underbalance created by the free volume within the carrier body. Burning of the solid propellant tablet may increase the pressure within the carrier body to a level lower than a hydrostatic pressure around the carrier body in the wellbore such that a dynamic underbalance is maintained.

Abstract: An assembly with a shock inducing tool and shock sensitive components. The assembly includes a shock mitigator that is constructed in a manner that allows a communication line to stretch across an interface of the mitigator between a housing for the components and the shock inducing tool. So, for example, where the tool is a perforating gun, power and/or communication with the tool need not be sacrificed for in exchange for safeguarding electronic components of the housing with the mitigator.

Abstract: A method and device for fracturing a subterranean formation by projecting a bullet assembly into the formation and then reacting energetic material within the bullet assembly. The bullet assembly can be part of a charge device that is in a perforating gun. A delay fuse can be included so the energetic material reaction begins after the bullet assembly reaches the end of its travel in the formation.

Abstract: This invention provides a structure for gunpowder charge in multi-frac composite perforation devices that is easy to assemble and transport while the charge volume of gunpowder is increased. In one embodiment of the present invention, an triplet outer gunpowder box is attached onto the outer wall of the charge frame and comprises one middle gunpowder box charged with gunpowder of certain burning rate, and two side-hung gunpowder boxes charged with gunpowder of another burning rate. The two side-hung gunpowder boxes are separately located on the two sides of the middle gunpowder box and are connected with the middle gunpowder box as a unit. The middle gunpowder box is located at a position corresponding to the perforating charge, and has an inner groove for orienting the perforating charge and a through hole through which the jet flow passes.

Abstract: Explosive carrier end plates for charge-carriers utilized in guns for the perforation of petroleum producing wells. Each gun is mounted coupled vertically with similar guns inside the casing of the well, and each gun is a hollow cylinder in the interior of which there is a corresponding tubular carrier that has multiple peripheral mountings for a radial placement of the shaped-charges. The carrier is mounted in the gun by means of a top insulating end plate that has a retractable electrical spring contact capable of pushing upwards, and a bottom insulating end plate. The end plates have a centering clip for anchoring in a respective window of the cylindrical wall of the carrier. Both end plates have a single removable insert axially fitted between two tubular inserts, which present reciprocal guiding and positioning means for a pin-keyway slot to enable mounting with the end plate.

Abstract: One or more ram accelerator devices may be used to form one or more holes in geologic or other material. These holes may be used for drilling, tunnel boring, excavation, and so forth. The ram accelerator devices propel projectiles which are accelerated by combustion of one or more combustible gasses in a ram effect to reach velocities exceeding 500 meters per second.

Abstract: An isolation sub for use in a perforating system that includes a pressure activated firing head. The isolation sub is set between the pressure source that is used to initiate the firing head. A pressure regulator in the sub is responsive to fluctuations in pressure difference between the pressure source and wellbore and isolates the firing head when the pressure difference is at or approaches a designated pressure difference that could initiate the firing head. The pressure regulator includes a spring loaded piston that seals the firing head from the source pressure before the pressure difference activates the firing head.

Abstract: A method of breaking rock which includes the steps of drilling a hole in the rock using a drill rod; leaving the drill rod in the hole; using water flow to direct a propellant charge into the hole through a passage in the drill rod; and at a leading end of the drill rod, firing the propellant charge with, at least, the drill rod and water in the hole and passage providing a stemming function.

Abstract: The invention relates to a device and a method for explosive drilling. Explosive capsules are fired by a firing device at a material to be stripped. A high degree of safety is attained in that use is made of an explosive with liquid oxygen that is only produced immediately before its application.

Abstract: A method and apparatus for driving at least one explosive driven projectile into an open hole or well bore of a subterranean formation for the purpose of stimulating productive formation. The apparatus is capable of pivoting within the open hole or well bore for desired firing at an angle and is also capable of deep penetration into a subterranean formation. The apparatus may also be conveyed by a tubing in horizontal drilling applications.

Abstract: A combination for performing a variety of functions includes (a) apparatus for moving a projectile or other mass along an arcuate path and moving the path substantially radially along a local radius of curvature and (b) a tool, vehicle or other article for receiving such projectile and being moved thereby.

Abstract: A perforating device has a carrier strip (e.g., a linear strip) on which are mounted capsule charges arranged in a desired pattern. The pattern can be a phased pattern, such as a spiral pattern, a triphase pattern, and so forth. Alternatively, the pattern is a 0°- or 180°-phased pattern for performing oriented perforating, with the capsule charges shooting in opposite directions with respect to a desired plane in the formation of the wellbore. One or more brackets can be used to mount the capsule charges to the strip. In one arrangement, the bracket has plural support rings to connect to the capsule charges. In another arrangement, multiple brackets each holding one or more capsule charges may be employed. In yet another arrangement, a tube containing the capsule charges in a phased arrangement can be used. In a further arrangement, instead of using brackets, threaded openings are provided in the carrier strip in which capsule charges can be threadably connected to provide the desired phased pattern.

Abstract: A technique includes arranging perforating charges of a perforating gun into groups of adjacent perforating charges. Each perforating charge of each group is aligned in a direction associated with the group. The groups are oriented to form a phasing for the perforating gun.