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9038521 Apparatus for creating and customizing intersecting jets with oilfield shaped charges  
A geological perforating tool (gun) shape charges disposed at an angle that provides an improvement over other known embodiments by accurately securing the charges in the tool to facilitate...
9027667 Structure for gunpowder charge in combined fracturing perforation device  
This invention provides a structure for gunpowder charge for charging gunpowders of different rates in combined fracturing perforation devices. The structure for gunpowder charge is convenient to...
9008919 Swing control apparatus and method of construction machinery  
A swing control apparatus and a swing control method for a construction machine are provided. The swing control apparatus includes a start position estimation unit, a stop target position...
8967291 Pressure-activated switch  
A first end of a conductive spring is embedded in a wall of a large chamber of a piston housing. The spring is held in tension by a second end of the spring being pinned against a bead contact by...
8967257 Method and apparatus for expendable tubing-conveyed perforating gun  
Methods and apparatus are presented for a “disappearing” perforator gun assembly. In a preferred method of perforating a well casing, inserted into the well casing is a tubing conveyed perforator...
8960289 Combined fracturing and perforating method and device for oil and gas well  
A combined fracturing and perforating method and device for oil and gas well are disclosed. The method utilizes an explosion of a perforating charge (5) in a combined fracturing perforator to...
8950509 Firing assembly for a perforating gun  
A firing assembly is configured to be contained in a recess formed in a wall of a tubular string subassembly and operates without blockage of the central core of the casing subassembly. The...
8943944 Structure for gunpowder charge in multi-frac composite perforating devices  
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...
8943943 Explosive carrier end plates for charge-carriers used in perforating guns  
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...
8931389 High voltage explosive assembly for downhole detonations  
A downhole explosive detonation comprises a high voltage electro-explosive initiator comprising an input high voltage power supply with a low impedance shunting fuse, a flexible electrical link...
8919253 Perforating string with magnetohydrodynamic initiation transfer  
A perforating system that transfers a detonation wave between adjacent perforating guns by converting shockwave energy to electrical energy. An explosive is provided on an end of a detonating cord...
8919444 System and method for enhanced wellbore perforations  
An apparatus for perforating a subterranean formation may include a casing, an energetic material, a liner, and an acid-generating material. The casing may have a slotted end configured to receive...
8910556 Bottom hole firing head and method  
Detonation of a perforating gun is initiated by engagement of the lower distal end of the gun assembly against a bottom hole bore plug. A fluid pressure actuated firing head is initiated by well...
8899346 Perforating assembly control  
A perforating assembly includes a material that can respond to a magnetic field by changing shape multiple times and causing a fire control circuit to activate and deactivate. The material may be...
8893785 Location of downhole lines  
A method of determining an azimuthal orientation of a well tool relative to a line in a well can include connecting at least one acoustic source to the well tool, the acoustic source having a...
8881816 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly is provided. The perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to...
8875796 Well tool assemblies with quick connectors and shock mitigating capabilities  
A method can include interconnecting a well tool in a well tool assembly with a shock mitigating connection, the interconnecting being performed without threading, and positioning the well tool...
8844625 Perforating gun spacer  
Perforating gun connectors are provided with a small diameter inner tube to house the detonating cord and an outer load-bearing tube that is ported to be in pressure balance. The inner tube...
8807003 Perforating gun assembly and method for controlling wellbore pressure regimes during perforating  
A method comprises providing a gun string assembly within a wellbore and perforating the wellbore using the gun string assembly. The gun string assembly comprises a plurality of perforating guns...
8789467 Surface safe explosive tool  
An explosive tool comprises a body structure, a charge, a detonator to ignite the charge via propagation of thermal energy, a pressure actuated safety to prevent propagation of sufficient thermal...
8763532 Devices and methods for perforating a wellbore  
An apparatus and method for perforating a subterranean formation is disclosed. The apparatus includes a tubular carrier; a charge tube disposed in the tubular carrier; and at least one shaped...
8763507 Flow isolation sub for tubing operated differential pressure firing head  
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...
8746331 Rust resistant well perforating gun with gripping surfaces  
A rust resistant well perforating gun to fractionate a formation adjacent a well can include a gun carrier with recesses, threaded sections, seal bores, and a first coating to prevent rust. The...
8739673 Perforating gun assembly and method for controlling wellbore pressure regimes during perforating  
A method comprises: a. determining a configuration of a gun string, b. determining, by a computer, a pressure transient at a location in a wellbore, c. comparing the one or more pressures with the...
8726996 Device for the focus and control of dynamic underbalance or dynamic overbalance in a wellbore  
A downhole tool assembly for use in a wellbore includes a tubular body carrying an explosive which is selectively detonated to create a dynamic underbalance or overbalance effect in the wellbore....
8714252 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to reduce the speed of propagation of a...
8714251 Shock load mitigation in a downhole perforation tool assembly  
A perforation tool assembly comprises an energy train, a first perforation gun, and a second perforation gun. The energy train comprises a moderator to reduce the speed of propagation of a...
8700272 System and method for detecting a crest  
A system for automated control of a machine having a ground engaging work implement includes an implement load sensor system. A controller determines a change in terrain based at least in part...
8684083 Perforating gun with rotatable charge tube  
A perforating gun designed to orient a charge holding structure (e.g., tube, solid rod) within a barrel of the perforating gun to be at the same position relative to a wellbore casing regardless...
8672031 Perforating with wired drill pipe  
Embodiments of the invention include methods and systems for perforating a well using a wired work string assembly. According to embodiments of the invention, the method includes positioning a...
8622149 Ballistic transfer delay device  
A ballistic transfer delay device and method of use. The ballistic transfer delay device does not include a firing pin and it is not pressure initiated. The device comprises a time delay fuse, a...
8596378 Perforating safety system and assembly  
Perforating assemblies and perforating safety systems capable of being disposed in a wellbore for hydrocarbon fluid production are described. The perforating assemblies can include an isolation...
8584763 Managing pressurized fluid in a downhole tool  
A wellbore apparatus includes a connector sub assembly having a body, the body having a first end adapted to couple to a first perforating sub component and a second, axially opposed end adapted...
8584772 Shaped charges for creating enhanced perforation tunnel in a well formation  
A shaped charge includes a charge case; an explosive disposed inside the charge case; and a liner for retaining the explosive in the charge case, wherein the liner comprises a material reactive...
8579022 Apparatus for deploying and activating a downhole tool  
An apparatus for deploying and activating a downhole tool activated by an explosive charge such as a drill pipe cutter or hole puncher. The apparatus includes a sealing member with an external...
8561683 Wellbore tubular cutter  
An apparatus and a method for cutting a wellbore tubular may include an upper section and a lower section mating at a juncture plane defined by a plane transverse to the longitudinal axis of the...
8555764 Perforating gun assembly and method for controlling wellbore pressure regimes during perforating  
A downhole tool gun string assembly comprises a first perforating gun operable to generate a first pressure at a first location in a wellbore, wherein the first perforating gun comprises a first...
8544563 Oil well perforators  
An oil and gas well shaped charge perforator capable of providing an exothermic reaction after detonation is provided, having a housing, a high explosive, and a reactive liner where the high...
8517120 Perforation tool with switch  
A perforation tool e.g. for perforation of a formation, a well or the like downhole by detonation of a charge. The perforation tool has at least one charge and at least one switch for detonation...
8443886 Perforating gun with rotatable charge tube  
A perforating gun designed to orient a charge holding structure (e.g., tube, solid rod) within a barrel of the perforating gun to be at the same position relative to a wellbore casing regardless...
8424455 Surface safe explosive tool  
An explosive tool is disclosed. The explosive tool comprises a body structure, a charge, a detonator to ignite the charge via propagation of thermal energy, a pressure actuated safety to prevent...
8397814 Perforating string with bending shock de-coupler  
A bending shock de-coupler for use with a perforating string can include perforating string connectors at opposite ends of the de-coupler. A bending compliance of the de-coupler may substantially...
8393392 Method and apparatus for perforating multiple wellbore intervals  
A bottom hole assembly for one trip perforating and treating a wellbore, the bottom hole assembly including: a tool body including an outer surface and an upper end; a fluid passage extending into...
8381822 Managing pressurized fluid in a downhole tool  
A wellbore apparatus includes a connector sub assembly having a body, the body having a first end adapted to couple to a first perforating sub component and a second, axially opposed end adapted...
8365814 Pre-verification of perforation alignment  
A perforating system, comprising a perforating gun with shaped charges, and a pre-detonation orientation apparatus and method. The pre-detonation orientation device comprises an orientation device...
8365824 Perforating and fracturing system  
A system for use in borehole completion is provided and includes a perforating sub, a firing sub having a first port and an interior and including a firing assembly disposable within the interior...
8347963 Controlling transient underbalance in a wellbore  
A method of perforating a well includes selecting a desired transient underbalanced condition, configuring a perforating gun string to achieve the transient underbalanced condition, deploying the...
8342094 Dissolvable material application in perforating  
A shaped charge includes a charge case; a liner; an explosive retained between the charge case and the liner; and a primer core disposed in a hole in the charge case and in contact with the...
8336437 Perforating gun assembly and method for controlling wellbore pressure regimes during perforating  
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...
8322463 Down hole multiple piston tools operated by pulse generation tools and methods for drilling  
An underground drilling method where drilling fluid pulsing down hole tool is combined with a multiple in series pistons down hole tool to provide vigorous vibrations in the drill string and...