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| Number | Title | Issue Date |
| 7360587 | Debris reduction perforating apparatus A perforating apparatus (100) includes a plurality of shaped charges (102) each having a case, an initiation end and a discharge end. A detonating cord (116) is operably associated with the initiation ends of the shaped charges (102). An ... | 04/22/2008 |
| 7360599 | Debris reduction perforating apparatus and method for use of same A perforating apparatus (100) includes a plurality of shaped charges (102) each having a case, an initiation end and a discharge end. A detonating cord (116) is operably associated with the initiation ends of the shaped charges (102). An ... | 04/22/2008 |
| 7350448 | Perforating apparatus, firing assembly, and method A firing assembly for activating a perforating device comprising a module having a first chamber and a second chamber. The firing assembly comprises a firing head for transferring ballistic energy to the perforating device, said firing head having a detonator and a ... | 04/01/2008 |
| 7331392 | Pressure range delimited valve A differential pressure valve has a valve body containing a main piston axially moveable therein to open a fluid inlet to a fluid outlet at preset high pressure and to close at a preset lower pressure. A high pressure trigger piston and a low pressure trigger piston... | 02/19/2008 |
| 7325620 | Recoverable, reinforced and vibration-damping plug used for cased wells This invention refers to a recoverable, reinforced and vibration-damping plug for cased wells, said wells being for oil, water, gas or any other similar fluid; said plug may be used for conventional casing perforation, high penetration casing perforation and casing ... | 02/05/2008 |
| 7258054 | Continuous explosive charge assembly for use in an elongated cavity A method and apparatus for placement of continuous pre-split, gel explosive in an elongated borehole or cavity. An anchor is attached to one end of a selected length of continuous gel explosive. A suitable anchor is a flexible, plastic “pilgrim's hat” with a hol... | 08/21/2007 |
| 7246548 | Well perforating gun Embodied herein is a perforating gun wall that withstands short, high energy pulses of an explosion retained within a loading tube with numerous explosive shaped charges. The perforating gun wall includes two or more layers with an impact strength sufficient to main... | 07/24/2007 |
| 7191828 | Hydraulically set concentric packer with multiple umbilical bypass through the piston A hydraulically set concentric packer with multiple umbilical bypass through the piston. In a described embodiment, a packer for use in a subterranean well includes a piston which displaces to set the packer in the well, and a line extending through the piston. The ... | 03/20/2007 |
| 7152679 | Downhole tool for deforming an object A downhole tool comprises a body defining a fluid chamber, a fluid outlet for directing fluid outwardly of the chamber, and an arrangement for producing a rapid reduction in the volume of the chamber, such that fluid in the chamber is displaced rapidly through the o... | 12/26/2006 |
| 7128152 | Method and apparatus to selectively reduce wellbore pressure during pumping operations A downhole tool has at least one diverter valve. The diverter valves are used to reduce pressure in a wellbore caused by frictional resistance to fluid flow during a gravel pack operation. The increased pressure tends to be created as the beta wave of a gravel pack ... | 10/31/2006 |
| 7111685 | Downhole sampling apparatus and method A method and apparatus for reducing debris in a perforation in a wellbore extending from the wellbore into a subterranean formations is provided. A housing is positioned in the wellbore, and an arm is extended therefrom. One or more plugs are positionable in the per... | 09/26/2006 |
| 7059407 | Method and apparatus for stimulation of multiple formation intervals The invention discloses methods of, as well as apparatus and systems for, perforating and treating multiple intervals of one or more subterranean formations intersected by a wellbore by deploying within said wellbore a bottom-hole assembly (“BHA”) having a perfo... | 06/13/2006 |
| 7059405 | Methods of treating subterranean formations using low-molecular-weight fluids The present invention relates to systems and methods useful in subterranean treatment operations. Examples of methods of the present invention include methods for fracturing a portion of a subterranean formation penetrated by a well bore; methods of enhancing produc... | 06/13/2006 |
| 7013977 | Sealed connectors for automatic gun handling A sealed perforating gun assembly for use with automatic pipe handling equipment on oil and gas drill rigs. An upper sealed connector and a lower sealed connector have sealed threaded connections for mating with ends of a perforating gun. The connectors have externa... | 03/21/2006 |
| 7000697 | Downhole measurement apparatus and technique A system that is usable with a subterranean well that has a casing includes an apparatus that is associated with production of fluid from the well and is located downhole in the well in a passageway of the casing. The system also includes a sensor that is located do... | 02/21/2006 |
| 6966377 | Providing a low pressure condition in a wellbore region An apparatus and method includes positioning a string in a wellbore, the string having a surge chamber. A closure member is provided below the well surface, with the surge chamber defined at least in part by the closure member. At least one port to the chamber is op... | 11/22/2005 |
| 6964301 | Method and apparatus for subsurface fluid sampling The apparatuses and methods herein relate to techniques for extracting fluid from a subsurface formation. A downhole sampling tool is provided with a probe having an internal wall capable of selectively diverting virgin fluids into virgin flow channels for sampling,... | 11/15/2005 |
| 6955217 | Method and apparatus for a tubing conveyed perforating guns fire identification system using fiber optics A method and apparatus for determining whether a tubing conveyed perforating (TCP) gun has fired by detecting a change in characteristics of the flow of an oil well. A method and apparatus detects the presence of fluorescent tracer dye to determine whether or not a ... | 10/18/2005 |
| 6901865 | Primer casing and method of charging a blasthole Primer casing (1) comprising sleeve portion (5) and leading portion (5a), wherein sleeve portion (5) includes tabs (6) to retain primer (11) and blasthole engagement means (2), and wherein leading portion (5... | 06/07/2005 |
| 6805056 | Method and apparatus for removing abandoned tubular members A method and apparatus for removing a tubular member (e.g., leg of an abandoned or obsolete fixed platforms in a marine environment) is provided. The apparatus includes a delivery system having a frame carrying explosive shaped charges. The frame includes charges ha... | 10/19/2004 |
| 6722251 | Method for loading a continuous explosive charge assembly in an elongated cavity A method and apparatus for placement of continuous pre-split, gel explosive in an elongated borehole or cavity. An anchor is attached to one end of a selected length of continuous gel explosive. A suitable anchor is a flexible, plastic “pilgrim's hat” with a hol... | 04/20/2004 |
| 6672405 | Perforating gun assembly for use in multi-stage stimulation operations A perforating gun assembly for use in perforating multiple intervals of at least one subterranean formation intersected by a cased wellbore and in treating the multiple intervals using a diversion agent, such as ball sealers. In one embodiment, the appara... | 01/06/2004 |
| 6595289 | Method and apparatus for plugging a wellbore The present invention provides a method and apparatus for plugging a wellbore in a trip saving manner. In one aspect, the invention includes a cement retainer disposed on a run-in string and a radially expanded perforating assembly disposed below the ceme... | 07/22/2003 |
| 6564686 | Continuous explosive charge assembly and method for loading same in an elongated cavity A method and apparatus for placement of continuous pre-split, gel explosive in an elongated borehole or cavity. An anchor is attached to one end of a selected length of continuous gel explosive. A suitable anchor is a flexible, plastic "pilgrim's hat" wit... | 05/20/2003 |
| 6502631 | Reinforced borehole plugs Reinforced borehole plugs useful in the presplitting and blast removal of earth formations, the improvements provided by the invention comprising inflatable devices intended to support stemming, explosives and the like at suspended locations within a bore... | 01/07/2003 |
| 6386288 | Casing conveyed perforating process and apparatus A process and apparatus for completing a subterranean well bore in at least one subterranean formation. At least one perforating gun assembly is positioned on the outside of casing in a subterranean well bore. A suitable signal, such as a hydraulic, elect... | 05/14/2002 |
| 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 reduced wall area provided in a tubular firing section whi... | 04/24/2001 |
| 6142231 | One-trip conveying method for packer/plug and perforating gun A one-trip system for placement and setting a downhole packer or plug is disclosed. The packer is settable in a variety of ways, including hydraulically, acoustically by pressure pulse signals, or some combination. Use of hydraulic pressure triggers a pre... | 11/07/2000 |
| 6032739 | Method of locating wellbore casing collars using dual-purpose magnet A method for sensing the location of a casing collar within a wellbore and for orientating a tool circumferentially and radially employs the use of a compact dual-purpose magnet. The method includes offsetting the position of the magnet relative to the to... | 03/07/2000 |
| 5816747 | Device for cutting a large diameter pipe and initiation manifold therefor A device (10) for explosively cutting a pipe (40) having an inner circumference has a carrier member (12) having a circumference. A support structure, such as a spring steel band (20), is releasably carried on the carrier member (12) in a retracted config... | 10/06/1998 |
| 5777257 | Shaped charge assembly with truncated liner The invention relates to an explosive charge assembly for cutting tubular members, particularly underwater. The assembly is lowered into the tubular member to a distance where the cut is to be performed. A shaped charge carrier has a pair of parallel circ... | 07/07/1998 |
| 5704426 | Zonal isolation method and apparatus A new zonal isolation method and apparatus perforates a plurality of zones of a formation, while isolating each perforated zone from every other zone, with one trip into wellbore, and without requiring the circulation of a kill fluid throughout the wellbo... | 01/06/1998 |
| 5611401 | One-trip conveying method for packer/plug and perforating gun A one-trip system for placement and setting a downhole packer or plug is disclosed. The packer is settable in a variety of ways, including hydraulically, acoustically by pressure pulse signals, or some combination. Use of hydraulic pressure triggers a pre... | 03/18/1997 |
| 5598894 | Select fire multiple drill string tester A system is provided for selectively perforating multiple zones in a well either simultaneously, or in series, having isolation barriers, or packers, located between the perforating multiple zones, without moving the system with respect to the well. The s... | 02/04/1997 |
| 5429192 | Method and apparatus for anchoring a perforating gun to a casing in a wellbore including a primary and a secondary anchor release mechanism A wellbore tool includes an anchor connected to a perforating gun, the anchor including an anchor slip disposed between upper and lower slip housings for expanding to grip a casing in the wellbore, a primary anchor release mechanism for unsetting the anch... | 07/04/1995 |
| 5423382 | Apparatus for releasing perforating gun equipment from a well casing Apparatus engageable with a well casing for suspending a perforating gun in the casing. The apparatus includes toothed slips forced into engagement with the well casing. A spring maintains an engaging force on the slips with the casing. In response to det... | 06/13/1995 |
| 5370186 | Apparatus and method of perforating wellbores An anchoring system for a perforating gun is disclosed which supports the gun from above. The anchor can be run in with conventional tools and is settable in the wellbore by pressurizing the wellbore. Upon increasing pressure in the wellbore, the anchor s... | 12/06/1994 |
| 5353875 | Methods of perforating and testing wells using coiled tubing Methods of draw-down and build-up testing on existing production wells are disclosed. The testing may be accomplished without removing the production tubing string from the well. The production of the well is shut down and then a coiled tubing test string... | 10/11/1994 |
| 5295544 | Decentralized casing hole puncher An explosive charge carrier is provided which is lowered into a well pipe casing. The carrier includes wear plates that slide along the inner diameter of the pipe and which are biased against the inner wall of the well pipe casing. A string of explosive c... | 03/22/1994 |
| 5211224 | Annular shaped power charge for subsurface well devices An annular shaped gas generating power charge is shown of the type which can be used in a downhole tool in a well. The charge is provided in the form of a longitudinal strip of solid propellant having a length and a width, a leading end which defines a bu... | 05/18/1993 |
