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Employee

  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 an 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 is also holds a position as adjunct professor in applied and computational mathematics at University of Bergen. This position is associated with Centre for Integrated Petroleum Research.

    2. O. Huseby R. Valestrand, G. Nævdal and J. Sagen: "Natural and conventional tracers for improving reservoir models using the EnKF approach." Accepted for publication in SPE Journal.
    3. R. Valestrand, J. Sagen, G. Nævdal and O. Huseby: “The effect of including tracer data in the ensemble Kalman filter approach.” SPE Journal, 2010.
    4. S. I. Aanonsen, G. Nævdal, D. S. Oliver, A. C. Reynolds and B. Vallès: “The ensemble Kalman filter in reservoir engineering – A review " in SPE Journal, Vol. 14, No. 3, pp. 393-412, September 2009.
    5. 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.
    6. A. Bianco, A. Cominelli, L. Dovera, G. Nævdal and B. Vallès: “History Matching and Production Forecast Uncertainty by Means of the Ensemble Kalman Filter: a Real Field Application.” Paper SPE 107161 at the SPE Europec/EAGE Annual Conference and Exhibition, London, United Kingdom, June 11-14, 2007.
    7. 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.
    8. 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.
    9. G. Nævdal, D. R. Brouwer and J.-D. Jansen: “Waterflooding using closed-loop control.” Computational Geosciences, Vol. 10, pp. 37-60, 2006.
    10. 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.
    11. 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.
    12. 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.
    13. 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.
    14. 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.
    15. A.-A. Grimstad, T. Mannseth, G. Nævdal and H. Urkedal: “Adaptive multiscale permeability estimation.” Computational Geosciences, Vol. 7, No. 1, pp. 1-25, 2003.
    16. 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.
    17. 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.
    18. 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.
    19. 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.
    20. 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.
    21. 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.
    22. C. R. Johnson, M. Lundquist and G. Nævdal: “Positive definite Toeplitz completions.” Journal of London Mathematical Society (2), Vol. 59, pp. 507-520, 1999.
    23. I. Thorsen, J. Ubøe and G. Nævdal: “A network approach to commuting.” Journal of Regional Science, Vol. 39, No. 1, pp. 73-101, 1999.
    24. M. Bakonyi and G. Nævdal: “On the matrix completion method for multidimensional moment problems.” Acta Sci. Math. (Szeged) Vol. 64, pp. 547-558, 1998.
    25. 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.
    26. G. Nævdal and H. J. Woerdeman: “Cone Inclusion Numbers.” SIAM Journal on Matrix Analysis and Applications. Vol. 19, No. 3, pp. 613-639, 1998.
    27. 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.
    28. G. Nævdal: “On a Generalization of the Trigonometric Moment Problem.” Linear Algebra and Its Applications. Vol. 258, pp. 1-18, 1997.
    29. 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.
    30. 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.
    31. 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.
    32. 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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