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Match Document Document Title
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...
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...
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...
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...
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...
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...
8210105 Method and device for detonating an explosive charge  
A method for detonation of a plug device in a fluid environment is described, which is in contact with a body, such as an ignition pellet, and it is characterized in that a number of pressure...
8079296 Device and methods for firing perforating guns  
A perforating gun train for perforating two or more zones of interest includes two or more gun sets made up of guns, one or more activators, and other associated equipment. An illustrative...
8006779 Pressure cycle operated perforating firing head  
Pressure cycle operated apparatus and methods. A method of actuating a firing head includes the steps of: reciprocably displacing an actuator piston of the firing head, the displacing step...
7886842 Apparatus and method for orienting a wellbore servicing tool  
A wellbore servicing apparatus, comprising a first mandrel movable longitudinally along a central axis and rotatable about the central axis, an orienting member configured to selectively interfere...
7770662 Ballistic systems having an impedance barrier  
A shaped charge assembly for use in a perforating gun that comprises a shaped charge holder, two or more shaped charges, slots formed to receive the shaped charges, and an impedance barrier...
7246659 Damping fluid pressure waves in a subterranean well  
A system and method of damping fluid pressure waves in a subterranean well. In a described embodiment, pressure waves are damped by positioning a dampener in the well during a perforating...
6918334 Perforating gun firing head with vented block for holding detonator  
A firing head for a perforating gun includes a detonating block having a first end and a second end, with the second end being structured and arranged so as to be located adjacent to a detonation...
6779605 Downhole tool deployment safety system and methods  
A safety system controls the activation of one or more downhole tools by providing selective transmission of an activation signal or an energy stream. In a preferred embodiment, transmission of...
6675896 Detonation transfer subassembly and method for use of same  
A detonation transfer subassembly for coupling two detonation activated tools in a work sting such that the work string may be severed between the two detonation activated tools without risk of a...
6662883 Charge tube assembly for a perforating gun  
A charge tube assembly for a perforating gun includes a tubular body having opposed ends. Integrally formed engagement members are positioned at each of the opposed ends. Detachable end plates are...
6220370 Circulating gun system  
A tubing conveyed perforating apparatus is shown which includes a tubular firing section which carries a plurality of explosive charges. The explosive charges are initially aligned with regions of...
6213203 Lock mechanism for use with a downhole device  
A downhole device and method for performing a function in a well. The device has a series of dedicated hydro-mechanical locks that prevent occurrence of an associated function. The...
6148916 Apparatus for releasing, then firing perforating guns  
A perforating gun can be conveyed on tubing and fired while disconnected from the tubing. The gun is retained to a running tool at the lower end of the tubing in a locked position. Actuating a...
6095258 Pressure actuated safety switch for oil well perforating  
A perforating gun assembly for perforating wellbores, comprising a shaped charge carrier assembly, a detonating cord for initiation OF shaped charges in the carrier assembly, an initiator attached...
6035880 Pressure activated switch valve  
A pressure activated valve and associated methods of using same provide increased functionality and convenience in actuating a tool operatively positioned within a subterranean well. In a...
5911277 System for activating a perforating device in a well  
Apparatus and method for activating a device in a well, such as firing a perforating gun in a well. An electrically-activated firing system is coupled to an actuating assembly, which includes a...
5908365 Downhole triggering device  
A self-contained tool incorporates an electronic system for significantly reducing the number of batteries required to detonate an explosive downhole, making the tool short enough for transport by...
5680905 Apparatus and method for perforating wellbores  
An apparatus for actuating a firing head is disclosed. The apparatus contains a firing head that is operatively connected to a detonating cord of a perforating gun containing a series of shaped...
5603384 Universal perforating gun firing head  
A firing head for actuating an explosive charge in a perforating gun. A firing pin is positioned within the firing head housing to actuate a booster charge leading to the perforating gun. The...
5571986 Method and apparatus for activating an electric wireline firing system  
A method and apparatus of activating electric wireline firing systems in which a firing pin is restrained against movement toward a detonator until application of sufficient voltage to the...
5551520 Dual redundant detonating system for oil well perforators  
The invention is an apparatus for initiating a wellbore perforator comprising a first firing head for generating a first explosive signal when a first actuation signal is applied to the first...
5540293 Firing Head  
An explosive or combustion actuated subsurface well tool includes a firing head for initiating operation of the tool in response to a projectile, such as a ball or go-devil, being pumped down a...
5490563 Perforating gun actuator  
An actuating tool which is conveyed into a tubing string to attach to portions of an emplaced perforating gun. The tool includes an actuator with an electronic delay timer and an explosive device....
5449039 Apparatus and method for horizontal well fracture stimulation  
An apparatus and method for perforating in deviated and horizontal wells. A firing pin and charge housing is integrally secured to a generally tubular body. The firing pin and charge housing has a...
5301755 Air chamber actuator for a perforating gun  
A firing head actuator for a perforating gun includes an atmospheric pressure chamber which is run into the well on a slick line. The atmospheric pressure chamber can then be communicated with a...
5237136 Hydrostatic pressure responsive bypass safety switch  
In accordance with illustrative embodiments of the present invention, a safety bypass switch for use with explosive well tools includes a hollow conductive body having a copper conductor rod...
5223665 Method and apparatus for disabling detonation system for a downhole explosive assembly  
A method and apparatus adapted to disable the actuation assembly for a perforating gun or any other detonation device used in subterranean wells to prevent premature surface detonation of the...
5215148 Subsurface well pressure actuated and fired apparatus  
A firing apparatus for use with a tubing-conveyed perforating apparatus is disclosed. Wellbore pressure applies an upward force to a first piston connected by a shearable coupling to a firing...
5191936 Method and apparatus for controlling a well tool suspended by a cable in a wellbore by selective axial movements of the cable  
In the representative embodiment of the method and apparatus of the invention which are disclosed herein, a well tool arranged for suspension in a well bore from a cable includes a mandrel that is...
5167282 Apparatus and method for detonating well perforators  
A pressure-actuated head for detonating a gun for perforating a well bore is suspended on a tubing string for lowering down the well. The head includes a detonator pin biased towards a detonator...
5161616 Differential firing head and method of operation thereof  
A differential firing head for a tubing conveyed perforation assembly includes a pressure-balanced firing pin propelled by a separate actuator assembly into a detonator to ignite charges in the...
5159145 Methods and apparatus for disarming and arming well bore explosive tools  
In the representative embodiments of the several methods and apparatus of the invention, a barrier formed of a low-temperature fusible metal alloy having a selected melting point is arranged...
5131472 Overbalance perforating and stimulation method for wells  
A method if disclosed for decreasing the flow resistance of a subterranean formation surrounding a well. A high fluid pressure is suddenly applied to the formation and fluid is pumped into the...
5052484 Electrical connector and contact assembly for vehicles  
An electrical connector device comprises an isolating support 20 and a conductive capsule 21 accessible from the exterior of the connector and fixed to the support 20 by a deformable membrane 22....
5050672 Pump apparatus including a firing head for use with a perforating gun on a tubing string  
A perforating gun having no firing head and no primary explosives is attached to a tubing string and the tubing string is run into a borehole. A new pump apparatus, having a firing head, is run...
5042593 Hydraulically damped detonator for use in perforating oil well tubing  
A hydraulically dampened detonator for firing an oil well perforating gun can be lowered into the well on a slick line (i.e., a solid cable line) and set rigidly against the well tubing inner...
5007344 Dual firing system for a perforating gun  
A unitary dual firing assembly includes a high explosive detonation cord with ends, each actuable by a different firing mechanism. The ends of the high explosive detonation cord are adjacent...
4967048 Safety switch for explosive well tools  
In accordance with illustrative embodiments of the present invention as disclosed herein, a safety switch for preventing accidental firing of an explosive well tool includes a tubular metal body...
4924952 Detonating heads  
A detonating head assembly (30) for detonating perforating guns in an oil, gas or water well, comprises a retrievable detonating head (34), a landing sleeve (50) and a stinger (42). The detonating...
4911251 Method and apparatus for actuating a tubing conveyed perforating gun  
A firing head which is actuatable by either mechanical or hydraulic force. The firing head includes two pistons, one releasable through mechanical force, and the other releasable through hydraulic...
4886127 Apparatus for firing borehole perforating apparatus  
In a preferred embodiment of the invention, a pressure actuated firing assembly for use in connection with a tubing conveyed perforating system is provided. The firing assembly is connected to a...
4850438 Modular perforating gun  
A modular perforating gun employing only secondary explosives therein, of a design permitting guns to be made up in tandem like drill pipe. The tandem guns have no physically connected shaped...

Matches 1 - 50 out of 143 1 2 3 >