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
Alain P Dorel: Rotary steerable well drilling system utilizing sliding sleeve. Schlumberger Technology Corporation, Steven L Christian, Wayne Kanak, December 12, 2000: US06158529 (133 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells, the system having a rotary drive component rotatable within a tubular sliding tool collar that incorporates elastic anti-rotation members to maintain a coupled relation with the borehole wall during drilling. ...


3
Reinhart Ciglenec, Alain P Dorel: Formation pressure measurement while drilling utilizing a non-rotating sleeve. Schlumberger Technology Corporation, Steven L Christian, May 15, 2001: US06230557 (122 worldwide citation)

A downhole tool and method are provided for collecting data from a subsurface formation during drilling operations. The tool includes a tubular mandrel adapted for axial connection in a drill string positioned in a wellbore penetrating the subsurface formation and a stabilizer element or sleeve posi ...


4
Reinhart Ciglenec, Lennox E Reid: Deployable sensor apparatus and method. Schlumberger Technology Corporation, John J Ryberg, Steven L Christian, May 22, 2001: US06234257 (112 worldwide citation)

An apparatus and method are provided for gathering data from a subsurface formation. A shell is utilized having a chamber therein, and being adapted for sustaining forcible propulsion into the subsurface formation. A data sensor is disposed within the chamber of the shell. The shell has a first port ...


5
Stuart Schaaf, Jean Seydoux, Walter Thain, Marcus Wernig, Alain Dorel: Apparatus and system for making at-bit measurements while drilling. Schlumberger Technology Corporatioin, Steven L Christian, Wayne I Kanak, May 2, 2000: US06057784 (100 worldwide citation)

The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The instrumentation can be located in a bit box, an extended sub between the drilling motor assembly and the bit box or in the drill bit. T ...


6
Jacques Tabanou, Reinhart Ciglenec, Clive Eckersley, Christian Chouzenoux: Reservoir monitoring through modified casing joint. Schlumberger Technology Corporation, John J Ryberg, Steven L Christian, JL, July 30, 2002: US06426917 (97 worldwide citation)

An apparatus and a method for controlling oilfield production to improve efficiency includes a remote sensing unit that is placed within a subsurface formation, an antenna structure for communicating with the remote sensing unit, a casing joint having nonconductive “windows” for allowing a internall ...


7
Alain P Dorel, Shu Kong Chang: Rotary steerable well drilling system utilizing hydraulic servo-loop. Schlumberger Technology Corporation, Steven L Christian, Wayne I Kanak, August 29, 2000: US06109372 (89 worldwide citation)

An actively controlled rotary steerable drilling system for directional drilling of wells including a tubular rotary tool collar having rotatably mounted thereabout a substantially non-rotatable sliding sleeve incorporating a plurality of elastic coupling members to maintain the sliding sleeve in co ...


8
Bernard Mougel, Remi Hutin: Apparatus and method for communication with downhole equipment using drill string rotation and gyroscopic sensors. Schlumberger Technology Corporation, John J Ryberg, Steven L Christian, D Delos Larson, July 31, 2001: US06267185 (79 worldwide citation)

Apparatus and methods are utilized for controlling downhole equipment attached to a drill string by the transmission of commands from the surface of the earth. The drill string is rotated at the surface of the earth sequentially through one or more discrete angles of rotation to generate a command c ...


9
Reinhart Ciglenec, Jacques R Tabanou, Remi Hutin: Formation data sensing with deployed remote sensors during well drilling. Schlumberger Technology Corporation, Steven L Christian, James L Jackson, February 22, 2000: US06028534 (78 worldwide citation)

A method and apparatus for acquiring data representing formation parameters while drilling a wellbore is disclosed. A well is drilled with a drill string having a drill collar that is located above a drill bit. The drill collar includes a sonde section having transmitter/receiver electronics for tra ...


10
Michelle Mary Felling, Charles W Morris, Robert J Butsch: Method to improve the quality of a formation fluid sample. Schlumberger Technology Corporation, John J Ryberg, Brigitte L Jeffery, Steven L Christian, January 30, 2001: US06178815 (77 worldwide citation)

The present invention provides a method for improving the quality of a formation fluid sample by taking the sample at a time when the formation fluid composition contains the most favorable portion of hydrocarbons. This task is accomplished by determining in real-time, the composition of the fluid f ...