Evaluating control designs for co-ordinating pump rates and choke valve during managed pressure drilling operations. - Øyvind Breyholtz; Gerhard Nygaard; John-Morten Godhavn; Erlend H. Vefring (CCA/ISIC, 2009)

Adaptive observer for kick detection and switched control for bottomhole pressure regulation and kick attenuation during managed pressure drilling. - Jing Zhou; Gerhard Nygaard; John-Morten Godhavn; Øyvind Breyholtz; Erlend H. Vefring (ACC, 2010)