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| Number | Title | Issue Date |
| 8167044 | Shaped charge A perforating apparatus that is usable with a well includes a shaped charge. The shaped charge includes a case, an explosive and a liner. The liner is adapted to form a perforation jet to form a perforation tunnel and promote an exothermic reaction inside the tunnel... | 05/01/2012 |
| 8127848 | Selectively angled perforating A method of perforating a wellbore by forming a perforation that is aligned with a reservoir characteristic, such as direction of maximum stress, lines of constant formation properties, and the formation dip. The wellbore can be perforated using a perforating system... | 03/06/2012 |
| 8061425 | System and method for dynamically adjusting the center of gravity of a perforating apparatus A perforating apparatus (240) used to perforate a subterranean well. The perforating apparatus (240) includes a generally tubular gun carrier (106) and a charge holder (242) rotatably mounted within the gun carrier (106). At least ... | 11/22/2011 |
| 8056632 | Downhole initiator for an explosive end device A perforating gun that is usable with a well includes at least one perforating charge and a initiator. The initiator includes an explosive ballistic train to the perforating charge(s). The initiator is adapted to physically misalign components of the ballistic train... | 11/15/2011 |
| 8042613 | Drilling head for reboring a stuck valve A drilling head, method of drilling, and use of the drilling head, for reboring a stuck valve or drilling into the formation downhole and, in particular a drilling tool having a drilling head and a driving unit. The drilling head includes a hole saw beside a drill b... | 10/25/2011 |
| 8020620 | Methods of producing flow-through passages in casing, and methods of using such casing Methods of making and using wellbore casing are described, one method comprising providing a plurality of flow-through passages in a portion of a casing while the casing is out of hole; temporarily plugging the flow-through passages with a composition while out of h... | 09/20/2011 |
| 8020619 | Severing of downhole tubing with associated cable Methods for severing tubing having a cable extending along its length include lowering a first cutting torch into the tubing to a desired location, igniting the first cutting torch, and directing cutting fluids in a circumferential arc to form a first cut in the tub... | 09/20/2011 |
| 8006762 | System and method of controlling surge during wellbore completion A downhole oilfield completion method comprises determining a surge profile for a wellbore and assembling a downhole completion tool having an interior surge volume and comprising a surge attenuation system operable to reduce a surge of the downhole completion tool ... | 08/30/2011 |
| 8002035 | System and method for dynamically adjusting the center of gravity of a perforating apparatus A perforating apparatus (170) used to perforate a subterranean well. The perforating apparatus (170) includes a generally tubular gun carrier (106) and a charge holder (172) rotatably mounted within the gun carrier (106). At least ... | 08/23/2011 |
| 7987911 | Oil well perforators An oil and gas well shaped charge perforator is provided comprising a housing, a high explosive, and a liner with a further insert liner where the high explosive is positioned between the liner and the housing. In use the high explosive will collapse the liner and i... | 08/02/2011 |
| 7984761 | Openhole perforating An underbalanced perforating system is disclosed for use in openhole completions to maximize the wellbore and matrix cleanup efficiency, to connect natural fracture patterns, and/or to enable application of new drilling fluid technology in difficult subsurface envir... | 07/26/2011 |
| 7980308 | Perforating gun assembly and method for controlling wellbore fluid dynamics A downhole tool used in the pressure isolation of adjacent subterranean formations. The downhole tool may comprise flow restriction devices along the outer circumference for impeding flow along the length of the tool. The tool may further comprise a perforating gun ... | 07/19/2011 |
| 7980309 | Method for selective activation of downhole devices in a tool string A system (100) for selective activation of explosive devices (126, 128, 130, 132) includes a surface controller (102), a downhole controller (106) operable to communicate bidirectionally with the surface controller over a first communicat... | 07/19/2011 |
| 7946344 | Method and assembly for producing oil and/or gas through a well traversing stacked oil and/or gas bearing earth layers An assembly for producing oil and/or gas through a well traversing stacked oil and/or gas bearing earth layers comprises a series of expandable packers and integrated perforating gun and sandscreen assemblies mounted on a production tubing such that each integrated ... | 05/24/2011 |
| 7934558 | System and method for dynamically adjusting the center of gravity of a perforating apparatus A perforating apparatus (100) used to perforate a subterranean well. The perforating apparatus (100) includes a generally tubular gun carrier (106) and a charge holder (104) rotatably mounted within the gun carrier (106). At least ... | 05/03/2011 |
| 7926566 | Method of making a downhole cutting tool, using a single piece tubular with a radially displaceable portion Disclosed herein relates to a single piece tubular member. The tubular member having a non-radially displaceable portion and a radially displaceable portion, the radially displaceable portion being movable to a position of similar radial displacement as that of the ... | 04/19/2011 |
| 7918279 | System and method for forming cavities in a well A technique of forming perforations in a wellbore. The formation of perforations is carefully controlled by a perforating device to create a series of sequential perforations in a desired arrangement. The perforating device is lowered to a desired location in the we... | 04/05/2011 |
| 7913761 | System and method for enhanced wellbore perforations A method for perforating a subterranean formation includes positioning a shaped charge and a reactant composite material in a carrier; positioning the carrier in the wellbore; detonating the shaped charge; and disintegrating the reactant composite material using a s... | 03/29/2011 |
| 7905285 | Method and apparatus for perforating a casing and producing hydrocarbons A perforating gun and one or more volume-receiving surge canisters can be actuated at a time delay after perforation for creating a dynamic underbalance condition to aid in directing debris out of the perforations and fractures and into the wellbore. A timer and tri... | 03/15/2011 |
| 7896077 | Providing dynamic transient pressure conditions to improve perforation characteristics A transient overbalance condition is created in a wellbore interval such that a pressure of the wellbore interval is greater than a reservoir pressure in surrounding formation. Creating the transient overbalance condition causes a near-wellbore region of the formati... | 03/01/2011 |
| 7878246 | Methods of perforation using viscoelastic surfactant fluids and associated compositions The invention provides a method for perforating a well with a perforating fluid comprising a viscoelastic surfactant that essentially stops fluid leak-off after perforation in an overbalanced condition. Another aspect of the invention provides the perforating fluid ... | 02/01/2011 |
| 7861783 | Method for adapting a tubular element in a subsiding wellbore A method for adapting a tubular element extending into a wellbore formed in an earth formation, where the tubular element is susceptible to damage caused by axially compressive forces acting on the tubular element as a result of compaction of the earth formation sur... | 01/04/2011 |
| 7861784 | System and method of controlling surge during wellbore completion A downhole oilfield completion method comprises determining a surge profile for a wellbore and assembling a downhole completion tool having an interior surge volume and comprising a surge attenuation system operable to reduce a surge of the downhole completion tool ... | 01/04/2011 |
| 7845410 | Openhole perforating An underbalanced perforating system is disclosed for use in openhole completions to maximize the wellbore and matrix cleanup efficiency, to connect natural fracture patterns, and/or to enable application of new drilling fluid technology in difficult subsurface envir... | 12/07/2010 |
| 7814978 | Casing expansion and formation compression for permeability plane orientation Casing expansion and formation compression for permeability plane orientation. A method of forming at least one increased permeability plane in a subterranean formation includes the steps of: installing a casing section in a wellbore intersecting the formation; expa... | 10/19/2010 |
| 7789153 | Methods and apparatuses for electronic time delay and systems including same Electronic time delay apparatuses and methods of use are disclosed. An explosive or propellant system, which may be configured as a well perforating system includes an electronic time delay assembly comprising an input subassembly, an electronic time delay circuit, ... | 09/07/2010 |
| 7775279 | Debris-free perforating apparatus and technique An apparatus that is usable with a well includes a perforating system that is adapted to be fired downhole in the well. The perforating system includes a component, which includes an alloy that has a negative corrosion potential and is unable to passivate, or self-p... | 08/17/2010 |
| 7757767 | Through tubing gun lock A lock for a perforating gun system comprising, a housing, a cylinder formed in the housing, a piston assembly disposed within the cylinder, and anchoring arms coupled with the piston assembly. Detonation of the shaped charges of an associated perforating gun produc... | 07/20/2010 |
| 7753121 | Well completion system having perforating charges integrated with a spirally wrapped screen An assembly that is usable with a well includes a base pipe, a screen and at least one perforating charge. The base pipe includes at least one radial port to communicate well fluid, and the base pipe has an outer surface. The screen is mounted to the base pipe and i... | 07/13/2010 |
| 7703525 | Well perforating and fracturing A system and method for perforating and fracturing enables sealing device on a working string to be actuated to substantially block passage of fluids through the wellbore. Without removing the working string from the wellbore, the working string is released from the... | 04/27/2010 |
| 7640986 | Device and method for reducing detonation gas pressure A perforating gun has a gun carrier extending in a longitudinal direction and a loading tube located within the gun carrier. The loading tube extends in the longitudinal direction and a shape charge is supported by the loading tube. The shape charge has a casing, an... | 01/05/2010 |
| 7635027 | Method and apparatus for completing a horizontal well A firing head assembly has a sealed chamber containing a piston, a firing pin, and an impact detonator. The firing head assembly and a perforating charge are installed within a sub and the sub is secured into a string of conduit being lowered into a wellbore. After ... | 12/22/2009 |
| 7621331 | Fluid communication nipple having an interior passageway with an interior wall section that may be opened to establish fluid communication with the passageway A fluid communication nipple including a tubular mandrel having an interior surface defining an internal bore and a passageway extending substantially lengthwise along a portion of the mandrel. The passageway is defined by an exterior wall section and an interior wa... | 11/24/2009 |
| 7600568 | Safety vent valve A perforating system connection sub comprising a vent valve for providing fluid flow communication through the connection sub wall. The vent valve is selectively opened and may include a frangible member. The frangible member is rupterable by the shock wave produced... | 10/13/2009 |
| 7588084 | Method for releasing cables from an attached well tool and apparatus for exercising the method In a method for releasing cables (2) from an attached well tool, where the cutting and the time for cutting can be decided from the surface above the well, and where a cable cutter (6) is arranged between the main part of a cable and a well tool, the c... | 09/15/2009 |
| 7571768 | Method and apparatus for perforating a casing and producing hydrocarbons A perforating gun and one or more volume-receiving surge canisters can be actuated at a time delay after perforation for creating a dynamic underbalance condition to aid in directing debris out of the perforations and fractures and into the wellbore. A timer and tri... | 08/11/2009 |
| 7565930 | Method and apparatus for stimulating wells with propellants The present invention relates to apparatus and methods to stimulate subterranean production and injection wells, such as oil and gas wells, utilizing rocket propellants. Rapid production of high-pressure gas from controlled combustion of a propellant, during initial... | 07/28/2009 |
| 7540326 | System and method for well treatment and perforating operations A technique is provided to facilitate perforation operations in a well. A well treatment operation is combined with a perforating operation to increase the efficiency of well preparation. A dart assembly has a dart for moving a well treatment fluid downhole and a pe... | 06/02/2009 |
| 7530397 | Explosive pipe severing tool A pipe severing tool is arranged to align a plurality of high explosive pellets along a unitizing support structure whereby all explosive pellets are inserted within or extracted from a tubular housing as a singular unit. Electrically initiated exploding wire detona... | 05/12/2009 |
| 7497259 | System and method for forming cavities in a well A technique is provided to form perforations in a wellbore. The formation of perforations is carefully controlled by a perforating device to create a series of sequential perforations in a desired arrangement. The perforating device is lowered to a desired location ... | 03/03/2009 |
