Abstract: A method and apparatus according to which a perforating gun includes a first detonation train and a second detonation train. The first detonation train is detonable to perforate a wellbore proximate a subterranean formation. The first detonation train includes a first detonating fuse and a perforating charge ballistically connected to the first detonating fuse. The second detonation train is detonable to increase an internal energy of the perforating gun after detonation of at least a portion of the first detonation train. The second detonation train includes a second detonating fuse ballistically connected to the first detonating fuse. In some embodiments, increasing the internal energy of the perforating gun after detonating the at least a portion of the first detonation train decreases and/or delays pressure drawdown within the wellbore.

Abstract: Wellbore pressure surge simulation systems, methods to perform pressure surge simulations, and methods to configure pressure surge simulation systems are disclosed. A wellbore pressure surge simulation system includes a core chamber configured to store a core sample of a downhole formation inside the core chamber. The wellbore pressure surge simulation system also includes a fluid chamber that is fluidly connected to the core chamber and having a first compartment that is configured to store a first fluid and a second compartment that is configured to store a second fluid. The wellbore pressure surge simulation system further includes a wellbore chamber positioned adjacent to the core chamber and configured to store the first fluid. The wellbore pressure surge simulation system further includes a flow restrictor configured to restrict fluid flow from the wellbore chamber.

Abstract: An apparatus is provided for treatment of process gas formed during nitric acid production by catalytic oxidation of NH3. The apparatus includes a reactor, a first catalyst bed for N2O decomposition, an absorption tower to react the NOx formed with an absorption medium downstream of the first catalyst bed, a device for adding NH3 added to tailgas entering the second catalyst bed, and a second catalyst bed for NOx reduction and further decrease in N2O in the tailgas exiting the absorption tower. The second catalyst bed contains at least one iron-loaded zeolite catalyst. N2O removal in the first catalyst bed is limited such that the process gas exiting the first catalyst bed exhibits a N2O content of >100 ppmv and a molar N2O/NOx ratio of >0.25. Treated gas exiting the second catalyst bed has a NOx concentration of <40 ppmv and a N2O concentration of <200 ppmv.

Abstract: Shaped charges used in wellbore perforating operations may be tested using a stressed rock perforating-charge testing system. The system includes a shaped charge testing chamber. The shaped charge testing chamber may include a loading and ejection piston and a core sample chamber. The core sample chamber is in mechanical communication with the loading and ejection piston and is sized to receive a core sample. The shaped charge testing chamber also includes a core sample stress applicator to apply stress to the core sample. Further, the system includes an ejection mechanism adjacent to the shaped charge testing chamber to provide an ejecting force on the loading and ejection piston.

Abstract: Provided are liners for a shaped charge and corresponding methods of use. An example liner comprises a generally conical shape having an apex, an open side, a liner wall comprising a thickness, and an axis extending through the center of the liner from the apex to the center of the open side. The liner comprises a liner height extending in a vertical plane from the center of the open side to the apex, a liner radius extending along a horizontal plane that is perpendicular to the axis at the open side of the liner and that extends from the axis to an outermost edge of the liner wall. The ratio of the liner height to the liner diameter is about 0.90 to about 1.10. The liner wall comprises an apex curvature, a first wall curvature, a second wall curvature, and a third wall curvature.

Abstract: Truss sections are commonly used at concerts and shows to support displays, camera, sound and lighting equipment. During transport or storage, the truss sections are stacked on top of each other. The apparatus is mountable to a cross member of a truss section. The apparatus comprises depressions on the surface. Longitudinal members (which are perpendicular to said cross member when stacked) of a second truss section can be positioned within the depressions to limit the relative movement between truss sections which are stacked.

Abstract: A downhole tool for perforating a borehole includes a gun body and charges arranged in a helix around the gun body and evenly spaced from both a nearest neighbor along the helix and a nearest neighbor in an adjacent wrap of the helix. Further, placement of the charges is based on a specified diameter of the borehole and specified charge density.

Abstract: A method and apparatus according to which a perforating gun includes a first detonation train and a second detonation train. The first detonation train is detonable to perforate a wellbore proximate a subterranean formation. The first detonation train includes a first detonating fuse and a perforating charge ballistically connected to the first detonating fuse. The second detonation train is detonable to increase an internal energy of the perforating gun after detonation of at least a portion of the first detonation train. The second detonation train includes a second detonating fuse ballistically connected to the first detonating fuse. In some embodiments, increasing the internal energy of the perforating gun after detonating the at least a portion of the first detonation train decreases and/or delays pressure drawdown within the wellbore.

Abstract: A perforating gun and method according to which a perforating charge of the perforating gun is detonated. Detonating the perforating charge produces shock waves. In some embodiments, detonating the perforating charge also perforates a wellbore proximate a subterranean formation. After detonating the perforating charge, first and second components of a binary energetic of the perforating gun are fragmented by the shock waves, mixed by the shock waves, and activated by the shock waves to increase an internal energy of the perforating gun. In some embodiments, increasing the internal energy of the perforating gun after detonating the perforating charge delays and/or decreases wellbore pressure drawdown.

Abstract: Aspects and features include a system and method for wellbore perforation analysis and design. The system takes into account geomechanical considerations. In some examples the system determines wellbore parameters associated with a wellbore in a formation, calculates a current effective stress value associated with a hole in the formation, and determines a maximum effective stress value and a minimum wellbore pressure value. The system can then produce perforating job parameters to maximize a perforation while maintaining at least the minimum wellbore pressure value. In some examples, the system makes use of a parts database to determine job parameters that can implemented based on available parts.

Abstract: A connection apparatus for attaching a first truss to a second truss has first and second connection segments, a bolt and an optional spring. The first connection segment has an aperture dimensioned to receive a threaded end and shank of the bolt. The aperture is also dimensioned to prevent the head end of the bolt and the threaded end from passing through. The aperture comprising a recess for receiving the second end of the spring. The first connection segment has a side opening, open to the aperture, dimensioned to receive the shank of the bolt. The first connection segment has a shoulder portion within the aperture dimensioned to closely fit around the shank and prevent the threaded end of the bolt from passing therethrough. The second connection segment for attaching to the second truss has a threaded hole dimensioned to fixably receive the threaded end of the bolt.

Abstract: The present disclosure provides an embodiment of a perforating gun assembly for use in a wellbore. The perforating gun assembly, in one example includes a carrier gun body. The perforating gun assembly, in this example, further includes a plurality of shaped charges supported within the carrier gun body, wherein each shaped charge may include a case exterior, the case exterior including an outer surface, and an inner surface forming a cavity, a liner located within the cavity, and explosive material located within a gap between the inner surface of the case exterior and the liner. The perforating gun assembly, in this example, may further include one or more momentum traps positioned between one or more adjacent shaped charges.

Abstract: A connection apparatus for attaching a first truss to a second truss has a first and second connection segment, a bolt and an optional spring. The first connection segment has an aperture dimensioned to receive the threaded end and the shank of the bolt. The aperture is also dimensioned to prevent the head end of the bolt and the threaded end from passing through, and the aperture comprising a recess for receiving the second end of the spring. The first connection segment also has a side opening, open to the aperture, dimensioned to receive the shank of the bolt. The first connection segment also has a shoulder portion within the aperture dimensioned to closely fit around the shank of the bolt and prevent the threaded end of the bolt from passing therethrough. The second connection segment for attaching to the second truss has a threaded hole dimensioned to fixably receive the threaded end of the bolt.

Abstract: An apparatus and method according to which a perforating gun includes a volume fill body. The volume fill body is positioned in the space between a charge tube and a carrier tube. The fill body occupies at least part, and sometimes all, of the free volume space between the charge tube and carrier tube thereby reducing the free volume space. In certain downhole applications, large free volume space can lead to significant reductions in wellbore pressure, causing dynamic underbalance, which is undesirable. The presence of the volume fill body prevents, or at least reduces, dynamic underbalance and its effects. Also, the volume fill body aligns the charge tube with the carrier tube, further assisting perforation.

Abstract: A connection apparatus for attaching a first truss to a second truss has a first and second connection segment, a bolt and an optional spring. The first connection segment has an aperture dimensioned to receive the threaded end and the shank of the bolt. The aperture is also dimensioned to prevent the head end of the bolt and the threaded end from passing through, and the aperture comprising a recess for receiving the second end of the spring. The first connection segment also has a side opening, open to the aperture, dimensioned to receive the shank of the bolt. The first connection segment also has a shoulder portion within the aperture dimensioned to closely fit around the shank of the bolt and prevent the threaded end of the bolt from passing therethrough. The second connection segment for attaching to the second truss has a threaded hole dimensioned to fixably receive the threaded end of the bolt.

Abstract: Truss sections are commonly used at concerts and shows to support displays, camera, sound and lighting equipment. During transport or storage, the truss sections are stacked on top of each other. The apparatus is mountable to a cross member of a truss section. The apparatus comprises depressions on the surface. Longitudinal members (which are perpendicular to said cross member when stacked) of a second truss section can be positioned within the depressions to limit the relative movement between truss sections which are stacked.

Abstract: A process and a plant for decreasing the concentration of NOx nitrogen oxides in the residual gas in the preparation of nitric acid, where the temperature of the residual gas is regulated by means of a temperature regulating apparatus during shutdown and/or start-up of the plant, with the residual gas being conveyed in a circuit and here flowing through the temperature regulating apparatus and the residual gas purification plant so that colorless shutdown and/or start-up of the plant is made possible.

Abstract: Systems and methods that employ dynamic credentials across distinct authentication standards can be used to reduce the burden associated with repeated re-authentication. A utility can be employed during logon in an alternate operating environment that stores information from the logon dynamically and generates a credential file that is employed to grant access to a resource without repeating the earlier logon procedure, even if the device changes its user state. After processes requiring resource access are complete, or when an allowed time expires, the granted access is revoked and the device returns to a default or standard authentication technique.

Abstract: A connection apparatus may be used to connect truss sections or other objects. A connection segment is mounted on each truss to be connected. Each of a first and second connection segment has an opening, in alignment with each other to receive a fastener. The opening of the first connection segment allows the fastener to pivot. The second connection segment has a side opening which allows the fastener to pivot inside and outside the body of the second connection segment. The fastener has a threaded end and a locking end. The locking end may be secured against an outer surface of the second connection segment. In the locked position the locking end of the fastener engages the outer surface of one the second connection segment and the fastener is prevented from rotational or axial movement. The connection segments are thus fixed relative to each other as are the truss sections on which the connection sections may be mounted.

Abstract: An apparatus is provided for carrying out a process for removing N2O and NOx from offgases by catalytic decomposition of N2O by means of iron-containing zeolite catalysts and catalytic reduction of the NOx by means of reducing agents, the deNOx stage connected downstream of the deN2O stage being operated at inlet temperatures of T<=400° C., and the inlet gas for the deN2O stage comprising water and having a selected N2O/NOx ratio, and the operating parameters of temperature, pressure and space velocity of the deN2O stage being selected so as to result in an N2O degradation of 80 to 98%. Under these conditions, a degree of NOx oxidation of 30-70% is established at the outlet of the deN2O stage, which is defined as the ratio of the molar amounts of NO2 to the total molar amount of NOx. The result of this is that the downstream deNOx stage can be operated under optimal conditions.