1
Ashley B Johnson, Lawrence A Behrmann, Wenbo Yang, Fokko Harm Cornelis Doornbosch: Controlling transient underbalance in a wellbore. Schlumberger Technology Corporation, Jeffrey Griffin, Brigitte Jeffery Echols, Trop Pruner & Hu PC, May 11, 2004: US06732798 (49 worldwide citation)

A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of ...


2
James E Brooks, Wenbo Yang, Brenden M Grove, Ian C Walton, Manish Kothari, Lawrence A Behrmann, Alfredo Fayard, Daniel C Markel, Wallace E Voreck: Components and methods for use with explosives. Schlumberger Technology Corporation, Jeffrey E Griffin, Brigitte L Jeffery, Trop Pruner & Hu PC, April 29, 2003: US06554081 (36 worldwide citation)

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To red ...


3
Wenbo Yang, Alfredo Fayard, Robert A Parrott, Klaus B Huber, Jeffrey P Meisenhelder, A Glen Edwards, Steven W Henderson, Joseph B Edone, Wanchai Ratanasirigulchai, Manuel Gonzalez: Method and apparatus for orienting perforating devices and confirming their orientation. Schlumberger Technology Corporation, Van Someren PC, Bryan P Galloway, Jaime A Castano, February 21, 2006: US07000699 (35 worldwide citation)

The present invention provides an apparatus and method of orienting perforating gun strings. One embodiment of the present invention provides an orienting weight provided in a portion of the perforating device, such as the shaped charge, the loading tube or the gun housing. Additional weight may be ...


4
Wenbo Yang, Brenden M Grove, Lawrence A Behrmann, Alfredo Fayard, Daniel C Markel: Encapsulant providing structural support for explosives. Schlumberger Technology, Jeffrey E Griffin, Brigitte Jeffery, Trop Pruner & Hu PC, February 18, 2003: US06520258 (30 worldwide citation)

An apparatus and method is provided to provide structural support for explosives (e.g., shaped charges) in a tool (e.g., a perforating gun). An encapsulant surrounds at least portions of the explosives to provide structural support for the explosives. The encapsulant contains a porous material, such ...


5
Wenbo Yang, Robert A Parrott: Method and apparatus for coupling explosive devices. Schlumberger Technology Corporation, Trop Pruner & Hu P C, June 4, 2002: US06397752 (30 worldwide citation)

A gun system in one arrangement includes a first carrier including a detonating cord and a second carrier including a detonating cord. An adapter couples the first and second carriers, with the adapter including an explosive coupled to the detonating cord of one of the first and second carriers. The ...


6
James E Brooks, Wenbo Yang, Brenden M Grove, Ian C Walton, Lawrence A Behrmann: Components and methods for use with explosives. Schlumberger Technology, Trop Pruner & Hu PC, Jaime A Castano, Brigitte Echols, May 24, 2005: US06896059 (27 worldwide citation)

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. To reduce interference, one or more shock impeding elements are placed proximal one or more explosives to impede propagation of shock caused by detonation of the explosives. The shock impeding ...


7
Ashley B Johnson, Lawrence A Behrmann, Wenbo Yang, Fokko Harm Cornelis Doornbosch: Creating an underbalance condition in a wellbore. Schlumberger Technology, Trop Pruner & Hu PC, Jaime A CastaƱo, Brigitte Echols, April 5, 2005: US06874579 (23 worldwide citation)

An apparatus and method of perforating and surging a section of the wellbore includes running a perforating gun into the well on a string having an isolation valve above the perforating gun, closing the valve, and perforating the well with the isolation valve closed so that the formation is isolated ...


8
Manuel Marya, Wenbo Yang, Lawrence A Behrmann, Steven W Henderson, Robert Ference, Brindesh Dhruva: Debris-free perforating apparatus and technique. Schlumberger Technology Corporation, Kevin B McGoff, Rodney Warfford, August 17, 2010: US07775279 (21 worldwide citation)

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-protect, while deployed in the well ...


9
Ashley B Johnson, Lawrence A Behrmann, Wenbo Yang, Fokko Harm Cornelis Doornbosch, Ian C Walton: Providing a low pressure condition in a wellbore region. Schlumberger Technology Corporation, Trop Pruner & Hu P C, Bryan P Galloway, Jaime A Castano, November 22, 2005: US06966377 (21 worldwide citation)

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 opened to create a fluid surge into ...


10
James E Brooks, Thomas H Zimmerman, Daniel C Markel, Wenbo Yang, James F Shelton, Wallace E Voreck: Shock barriers for explosives. Schlumberger Technology, Trop Pruner & Hu P C, May 14, 2002: US06386109 (21 worldwide citation)

An apparatus and method is provided to reduce interference resulting from activation of explosive devices. One type of interference is charge-to-charge interference, and another type of interference is pre-shock interference between a detonating cord and an explosive, such as a shaped charge. To red ...