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
Dimitrios K Pirovolou: Method of automatically controlling the trajectory of a drilled well. Schlumberger Technology Corporation, David J Smith, Dave R Hofman, June 7, 2011: US07957946 (8 worldwide citation)

Steering behavior model can include build rate and/or turn rate equations to modal bottom-hole assembly behavior. Build and/or turn rate equations can be calibrated by adjusting model parameters thereof to minimize any variance between actual response 118 and estimated response produced for an inter ...


3
Maja Ignova, Geoffrey C Downton, Dimitrios K Pirovolou: Directional drilling control devices and methods. SCHLUMBERGER TECHNOLOGY CORPORATION, March 28, 2017: US09605480

A drill control system includes an uphole control device and a downhole control device. The uphole control device is configured to transmit a reference trajectory to the downhole control device and receive information about an actual trajectory from the downhole control device. The downhole control ...


4
Dimitrios K Pirovolou, Geoff Downton: Downhole closed loop control of drilling trajectory. Tim Curington, Schlumberger Brunel Way, March 18, 2004: US20040050590-A1

A method for drilling a borehole, comprising transmitting a directional signal to a downhole processor, and maintaining the desired drill bit azimuthal direction by using the downhole processor to evaluate an actual drill bit azimuthal direction relative to the desired drill bit azimuthal direction, ...


5
Dimitrios K Pirovolou: Method of Automatically controlling the Trajectory of a Drilled Well. Schlumberger Technology Corporation, Schlumberger Oilfield Services, January 1, 2009: US20090000823-A1

Steering behavior model can include build rate and/or turn rate equations to modal bottom-hole assembly behavior. Build and/or turn rate equations can be calibrated by adjusting model parameters thereof to minimize any variance between actual response 118 and estimated response produced for an inter ...


6
Dimitrios K Pirovolou: Method of automatically controlling the trajectory of a drilled well. September 1, 2011: US20110213601-A1

Steering behavior model can include build rate and/or turn rate equations to model bottom-hole assembly behavior. Build and/or turn rate equations can be calibrated by adjusting model parameters thereof to minimize any variance between actual response 118 and estimated response produced for an inter ...


7
Dimitrios K Pirovolou: Method of automatically controlling the trajectory of a drilled well. Schlumberger Technology Corporation, zhangqun feng, December 31, 2008: CN200810128581

The invention discloses a method for controlling the trajectory of a drill string, which provides a steering behavior model can include build rate and/or turn rate equations to modal bottom-hole assembly behavior. Build and/or turn rate equations can be calibrated by adjusting model parameters there ...