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Brian Clark, Richard A Rosthal, Dean M Homan, Dzevat Omeragic, Stephen D Bonner, Scott S Chesser, Thomas D Barber: Method and apparatus for directional well logging with a shield having sloped slots. Schlumberger Technology Corporation, Victor H Segura, October 2, 2001: US06297639 (96 worldwide citation)

Methods and apparatus for making directional measurements of earth formations surrounding a borehole. New antenna coil shield designs are utilized to provide selective attenuation of at least one electromagnetic energy field component as the component interacts with the shield. The new shields are i ...


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Walter D Aldred, William Wright, Iain Rezmer Cooper, John Fuller, Shuja Goraya: Interactive method for real-time displaying, querying and forecasting drilling event and hazard information. Schlumberger Technology Corporation, Brigitte L Echols, Bryan L White, Victor H Segura, February 21, 2006: US07003439 (87 worldwide citation)

A method is disclosed for characterizing a drilling hazard. The method includes determining a well plan including at least a wellbore trajectory. A likelihood of occurrence of at least one drilling hazard is estimated. A severity of the at least one drilling hazard is estimated. The hazard is displa ...


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Patrick Fisseler, Tom Palmer, James Mather, Colin Longfield, Richard Meehan, Jean Marc Follini, Jean Michel Hache: Apparatus and method for acquiring information while drilling. Schlumberger Technology Corporation, Jennis Salazar, Matthias Abrell, Victor H Segura, October 3, 2006: US07114562 (82 worldwide citation)

An apparatus and method useful for acquiring information from a subsurface formation penetrated by a wellbore contemplate the use of a tubular body adapted for connection within a drill string disposed in the wellbore. The tubular body is equipped with one or more protuberances (e.g., ribs) defining ...


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William B Underhill, Cengiz Esmersoy, Brian Clark, Jean Michel Hache: Method and apparatus for communication with a downhole tool. Schlumberger Technology Corporation, John J Ryberg, Victor H Segura, October 23, 2001: US06308137 (81 worldwide citation)

An apparatus for communication with a downhole tool includes uphole and downhole equipment. The uphole equipment includes a signal source (or array) coupled to a programmable triggering system and a precision clock. Optionally, the uphole equipment may include receivers for capturing reference signa ...


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Qiming Li, John Lovell, Mark Fredette: Data compression method for use in wellbore and formation characterization. Schlumberger Technology Corporation, John J Ryberg, Brigitte L Jeffery, Victor H Segura, June 11, 2002: US06405136 (80 worldwide citation)

A method is disclosed for compressing a frame of data representing parameter values, a time at which each parameter value was recorded, and an orientation of a sensor at the time each parameter value was recorded. Generally the method includes performing a two-dimensional transform on the data in th ...


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Gerald N Minerbo, Richard A Rosthal: Method and apparatus for evaluating the resistivity of formations with high dip angles or high-contrast thin layers. Schlumberger Technology Corporation, John J Ryberg, Victor H Segura, October 16, 2001: US06304086 (74 worldwide citation)

A method and apparatus for evaluating the resistivity of earth formations surrounding a borehole, particularly high-contrast thin-layer formations or at high dip angles. The method involves positioning a pair of transmitters and a pair of receivers within the borehole, the receivers or transmitters ...


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Brian Clark, John Hunka, Mark T Frey, David L Smith, Dhananjay Ramaswamy, Anthony Collins, Stephen Bonner: Method and apparatus for downhole signal communication and measurement through a metal tubular. Schlumberger Technology Corporation, Victor H Segura, Brigitte L Jeffery, John J Ryberg, June 10, 2003: US06577244 (65 worldwide citation)

Systems and methods for downhole communication and measurement utilizing an improved metallic tubular having an elongated body with tubular walls and a central bore adapted to receive a run-in tool. The tubular including slotted stations to provide through-tubular signal transmission and/or receptio ...


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Dzevat Omeragic, Jean Seydoux, Richard A Rosthal: Shielding method and apparatus using transverse slots. Schlumberger Technology Corporation, John J Ryberg, Brigitte L Jeffery, Victor H Segura, May 20, 2003: US06566881 (62 worldwide citation)

A shielding method and apparatus for an antenna disposed on an elongated support adapted for disposal within a borehole. The shield providing predetermined attenuation of one or more electromagnetic energy field components as the field components interact with the shield. The shield composed of a fl ...


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Brian Clark, Martin G L├╝ling, Mark Frey, Dhananjay Ramaswamy, Anthony Collins: System and method for monitoring a reservoir and placing a borehole using a modified tubular. Schlumberger Technology Corporation, Victor H Segura, Brigitte L Jeffery, September 2, 2003: US06614229 (59 worldwide citation)

Systems and methods for monitoring a characteristic of a subterranean hydrocarbon reservoir and for placing a borehole in the vicinity of a well in an earth formation. New well completion systems with slotted stations are utilized to provide through-casing signal-transmission and/or reception. Hydra ...