1
Alexandre G E Kosmala, Attilio C Pisoni, Dimitrios K Pirovolou, Spyro J Kotsonis: Actively controlled rotary steerable system and method for drilling wells. Schlumberger Technology Corporation, James L Jackson, Wayne I Kanak, Steven L Christian, July 25, 2000: US06092610 (236 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells having a tool collar rotated by a drill string during well drilling. A bit shaft has an upper portion within the tool collar and a lower end extending from the collar and supporting a drill bit. The bit shaft i ...


2
Spyro J Kotsonis, Jacques Orban, Jean Michel Hache: Apparatus and method for generating electrical power in a borehole. Schlumberger Technology Corporation, Jennie Salazar, Victor H Segura, Dale V Gaudier, November 7, 2006: US07133325 (28 worldwide citation)

An apparatus and related method generate electrical power in a tubular housing, such as a drill collar, disposed in a borehole when drilling fluid flows through the tubular housing. The apparatus includes a stator adapted for being secured within the tubular housing against rotation relative to the ...


3
Spyro J Kotsonis, Jacques Orban, Jean Michel Hache: Apparatus and method for generating electrical power in a borehole. Schlumberger Technology Corporation, Schlumberger Oilfield Services, September 15, 2005: US20050200210-A1

An apparatus and related method generate electrical power in a tubular housing, such as a drill collar, disposed in a borehole when drilling fluid flows through the tubular housing. The apparatus includes a stator adapted for being secured within the tubular housing against rotation relative to the ...