| Nonlinear model predictive control scheme for stabilizing annulus pressure during oil well drilling G Nygaard, G Nævdal Journal of Process Control 16 (7), 719-732, 2006 | 124 | 2006 |
| Evaluation of control methods for drilling operations with unexpected gas influx LA Carlsen, G Nygaard, M Nikolaou Journal of Process Control 23 (3), 306-316, 2013 | 65 | 2013 |
| A novel model-based scheme for kick and loss mitigation during drilling E Hauge, OM Aamo, JM Godhavn, G Nygaard Journal of Process Control 23 (4), 463-472, 2013 | 62 | 2013 |
| On the advection-upstream-splitting-method hybrid scheme: a simple transient-flow model for managed-pressure-drilling and underbalanced-drilling applications JE Udegbunam, KK Fjelde, S Evje, G Nygaard SPE Drilling & Completion 30 (02), 98-109, 2015 | 58 | 2015 |
| Automatic model-based control scheme for stabilizing pressure during dual-gradient drilling J Zhou, G Nygaard Journal of Process Control 21 (8), 1138-1147, 2011 | 55 | 2011 |
| Reservoir characterization during underbalanced drilling (UBD): Methodology and active tests EH Vefring, G Nygaard, RJ Lorentzen, G Naevdal, KK Fjelde SPE Journal 11 (02), 181-192, 2006 | 53 | 2006 |
| Adaptive observer for kick detection and switched control for bottomhole pressure regulation and kick attenuation during managed pressure drilling J Zhou, G Nygaard, JM Godhavn, Ø Breyholtz, EH Vefring Proceedings of the 2010 American Control Conference, 3765-3770, 2010 | 52 | 2010 |
| Automatic control of managed pressure drilling Ø Breyholtz, G Nygaard, M Nikolaou Proceedings of the 2010 American Control Conference, 442-447, 2010 | 44 | 2010 |
| Reservoir characterization during underbalanced drilling: Methodology, accuracy, and necessary data EH Vefring, G Nygaard, KK Fjelde, RJ Lorentzen, G Nævdal, A Merlo SPE Annual Technical Conference and Exhibition?, SPE-77530-MS, 2002 | 43 | 2002 |
| Evaluating nonlinear kalman filters for parameter estimation in reservoirs during petroleum well drilling G Nygaard, G Nævdal, S Mylvaganam 2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE …, 2006 | 37 | 2006 |
| Automatic coordinated control of pump rates and choke valve for compensating pressure fluctuations during surge and swab operations GH Nygaard, E Johannessen, J Einar Gravdal, F Iversen SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference …, 2007 | 36 | 2007 |
| Using nmpc based on a low-order model for controlling pressure during oil well drilling GH Nygaard, LS Imsland, EA Johannessen IFAC Proceedings Volumes 40 (5), 159-164, 2007 | 36 | 2007 |
| Managed pressure drilling: A multi-level control approach Ø Breyholtz, G Nygaard, H Siahaan, M Nikolaou SPE Intelligent Energy International Conference and Exhibition, SPE-128151-MS, 2010 | 35 | 2010 |
| Reservoir characterization during ubd: Methodology and active tests EH Vefring, G Nygaard, RJ Lorentzen, G Nævdal, KK Fjelde SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference …, 2003 | 35 | 2003 |
| A simple transient flow model for mpd and ubd applications JE Udegbunam, KK Fjelde, S Evje, G Nygaard SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference …, 2014 | 32 | 2014 |
| Bottomhole pressure control during drilling operations in gas-dominant wells GH Nygaard, EH Vefring, KK Fjelde, G Nævdal, RJ Lorentzen, ... SPE Journal 12 (01), 49-61, 2007 | 32 | 2007 |
| Managed-pressure drilling: Using model predictive control to improve pressure control during dual-gradient drilling Ø Breyholtz, G Nygaard, M Nikolaou SPE Drilling & Completion 26 (02), 182-197, 2011 | 31 | 2011 |
| Evaluating control designs for co-ordinating pump rates and choke valve during managed pressure drilling operations O Breyholtz, G Nygaard, JM Godhavn, EH Vefring 2009 IEEE Control Applications,(CCA) & Intelligent Control,(ISIC), 731-738, 2009 | 30 | 2009 |
| Automatic calibration of real-time computer models in intelligent drilling control systems-results from a north sea field trial HP Lohne, JE Gravdal, EW Dvergsnes, G Nygaard, EH Vefring IPTC 2008: International Petroleum Technology Conference, cp-148-00219, 2008 | 27 | 2008 |
| Performing the dynamic shut-in procedure because of a kick incident when using automatic coordinated control of pump rates and choke-valve opening LA Carlsen, G Nygaard, JE Gravdal, M Nikolaou, J Schubert SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference …, 2008 | 27 | 2008 |
Erlend VefringVice President NORCEVerified email at norceresearch.no