 |
Name: | Geir Nævdal |
| Position: | Chief Scientist |
| Research group: | Reservoir |
| Email: | Geir.Naevdal@iris.no |
| Phone: | (+47) 55 54 39 34 |
Personal information:
Geir Nævdal is a chief scientist at IRIS and adjunct professor in applied and computational mathematics at Department of Mathematics/Centre for Integrated Petroleum Research, Univeristy of Bergen.
He holds a Dr. Ing. degree in Mathematics, from Norwegian Institue of Technology (1991). He worked as an Associate Professor at Stord/Haugesund College 1991-1997. He joined Rogaland Research in 1997, and has been a chief scientist at IRIS since 2004. From 2009 he also holds a position as adjunct professor in applied and computational mathematics at University of Bergen.
Selected publications:
| K. Thulin, G. Nævdal, H. J. Skaug and S. I. Aanonsen | Quantifying Monte Carlo Uncertainty in the ensemble Kalman filter. Accepted for publication in SPE Journal. |
| O. Huseby, R. Valestrand, G. Nævdal and J. Sagen | Natural and conventional tracers for improving reservoir models using the EnKF approach. To appear in SPE Journal. |
| R. Valestrand, J. Sagen, G. Nævdal and O. Huseby | The effect of including tracer data in the ensemble Kalman filter approach. SPE Journal, Vol. 15, No. 2, pp. 454-470, June 2010. |
| S. I. Aanonsen, G. Nævdal, D. S. Oliver, A. C. Reynolds and B. Vallès | The ensemble Kalman filter in reservoir engineering – A review. SPE Journal, Vol. 14, No. 3, pp. 393-412, September 2009. |
| V. Haugen, G. Nævdal, L.-J. Natvik, G. Evensen, A. M. Berg and K.M Flornes | History matching using the ensemble Kalman filter on a North Sea Field case. In SPE Journal, Vol. 13, No. 3, pp. 382-391, 2009. |
| G. H. Nygaard, E. H. Vefring, K. K. Fjelde, G. Nævdal and R. J. Lorentzen | Bottomhole Pressure Control During Pipe Connection in Gas-Dominant Wells. SPE Journal, Vol. 12, No. 1, pp. 49-61, March 2007. |
| E. H. Vefring, G. Nygaard, R. J. Lorentzen, G. Nævdal and K. K. Fjelde | Reservoir Characterization during UBD: Methodology and Active Tests. SPE Journal, Vol. 11, No. 2, pp. 181-192, June 2006. |
| G. Nævdal, D. R. Brouwer and J.-D. Jansen | Waterflooding using closed-loop control. Computational Geosciences, Vol. 10, pp. 37-60, 2006. |
| G. Nygaard and G. Nævdal | Nonlinear model predictive control scheme for stabilizing annulus pressure during oil well drilling. Journal of Process Control, Vol. 16, pp. 719-732, 2006. |
| R. J. Lorentzen, G. Nævdal, B. Vallès, A. M. Berg and A.-A. Grimstad | Analysis of the ensemble Kalman filter for estimation of permeability and porosity in reservoir models. Paper SPE 96375 at the SPE Annual Technical Conference and Exhibition, Dallas, Texas, 9 – 12 October, 2005. |
| G. Nævdal, L. M. Johnsen, S. I. Aanonsen and E. H. Vefring | Reservoir Monitoring and Continuous Updating Using Ensemble Kalman Filter. SPE Journal, pp. 66-74, March 2005. |
| J. D. Jansen, D. R. Brouwer, G. Nævdal and C. P. J. W. van Kruijsdijk | Closed-loop reservoir management. First Break. Vol. 23, pp. 43-48, Jan. 2005. |
| R. J. Lorentzen, G. Nævdal and A. C. V. M. Lage | Tuning of parameters in a two-phase flow model using ensemble Kalman filter. Int. J. Multiphase Flow, Vol. 29, No. 8, pp. 1283-1309, 2003. |
| A.-A. Grimstad, T. Mannseth, G. Nævdal and H. Urkedal | Adaptive multiscale permeability estimation. Computational Geosciences, Vol. 7, No. 1, pp. 1-25, 2003. |
| G. Nævdal, T. Mannseth and E. Vefring | Instrumented Wells and Near-Well Reservoir Monitoring trough Ensemble Kalman Filter. Proceedings of 8th European Conference of the Mathematics of Oil Recovery, Freiberg, Germany, 3-6 September, 2002. |
| G. Nævdal, T. Mannseth, and E. H. Vefring | Near-Well Reservoir Monitoring Through Ensemble Kalman Filter. Paper SPE 75235 at The 2002 SPE/DOE Improved Oil Recovery Symposium, Tulsa, April 13-17, 2002. |
| R. Valestrand, A.-A. Grimstad, K. Kolltveit, G. Nævdal and J.-E. Nordtvedt | Simultaneous determination of absolute and relative permeabilities. International Journal of Thermal Sciences Vol. 41, pp. 546-556, 2002. |
| G. Nævdal, E. Vefring, A. Berg, T. Mannseth and J.-E. Nordtvedt | A new methodology for the optimization of the placement of downhole production monitoring sensors. SPE Journal Vol. 6, No. 1, pp. 108-116, March 2001. |
| G. Nævdal, T. Mannseth, K. Brusdal and J.-E. Nordtvedt | Multi-scale estimation with spline-wavelets, with application to two-phase porous-media flow. Inverse Problems, Vol. 16, pp. 315-332, 2000. |
| M. Bakonyi and G. Nævdal | The finite subsets of Z2 having the extension property. Journal of London Mathematical Society (2) Vol. 62, pp. 904 – 916, 2000. |
| C. R. Johnson, M. Lundquist and G. Nævdal | Positive definite Toeplitz completions. Journal of London Mathematical Society (2), Vol. 59, pp. 507-520, 1999. |
| I. Thorsen, J. Ubøe and G. Nævdal | A network approach to commuting. Journal of Regional Science, Vol. 39, No. 1, pp. 73-101, 1999. |
| M. Bakonyi and G. Nævdal | On the matrix completion method for multidimensional moment problems. Acta Sci. Math. (Szeged) Vol. 64, pp. 547-558, 1998. |
| M. Bakonyi and G. Nævdal | Characterization of finite subsets of Z2 having the extension property. C. R. Acad. Sci. Paris t. 326, Serie I, p. 417-420, 1998. |
| G. Nævdal and H. J. Woerdeman | Cone Inclusion Numbers. SIAM Journal on Matrix Analysis and Applications. Vol. 19, No. 3, pp. 613-639, 1998. |
| C. R. Johnson and G. Nævdal | The probability that a (partial) matrix is positive definite. Operator Theory: Advances and Applications, Vol. 103, pp. 171-182, 1998. |
| G. Nævdal | On a Generalization of the Trigonometric Moment Problem. Linear Algebra and Its Applications. Vol. 258, pp. 1-18, 1997. |
| G. Nævdal, I. Thorsen and J. Ubøe | Modeling Spatial Structures through Equilibrium States for Transition Matrices. Journal of Regional Sciences. Vol. 36, No. 2, pp. 171-196, 1996. |
| G. Nævdal | On the Completion of Partially Given Triangular Toeplitz Matrices to Contractions. SIAM Journal on Matrix Analysis and Applications. Vol. 14, No. 2, pp. 545-552, 1993. |
| G. Nævdal and H. J. Woerdeman | Partial Matrix Contractions and Intersection of Matrix Balls. Linear Algebra and Its Applications. Vol. 175, pp. 225-238, 1992. |
| G. Nævdal | A Comment on Parrott’s Theorem. SIAM Journal on Numerical Analysis. Vol. 28, No. 5, pp. 1517-1522, 1991. |
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