Publications

Ahsan, R., Madland, M.V., Bratteli, F. and Hiorth, A.: “A Study of Sulphate Ions-Effects on ageing and Imbibition Capillary Pressure Curve”  presented at The Int. Symposium of the Society of Core Analysts, August 27-30, 2012, Aberdeen, Scotland, UK

Andersen, P.Ø., Evje S.,Madland, M.V. and Hiorth, A.: «A geochemical model for interpretation of chalk core flooding experiments”, Chemical Engineering Science 84 (2012) 218–241

Austad, T., Strand, S.,  and Puntervold, T., “Is wettability alteration of carbonates by seawater caused by rock dissolution?”, paper presented at the International Symposium of the Society of Core Analysts held in Noordwijk, The Netherlands 27-30 September, 2009.

Austad, T., Strand, S., Høgnesen, E.J. and Zhang, P.,  “Seawater as IOR Fluid in Fractured Chalk” paper SPE 93000, presented at the 2005 SPE International Symposium on Oilfield Chemistry held in Houston, Texas, U.S.A., 2 – 4 February 2005.

Austad, T., Strand, S., Høgnesen, E.J. and  Zhang, P., ”Seawater as IOR-fluid in fractured chalk – A summary of ongoing experimental activities within COREC”, paper presented at the 25th Annual Workshop & Symposium, Collaborative Project on enhanced oil Recovery, IEA, Stavanger, September 5-8, 2004.

Berenblyum, R.,  Zuta, J.F., Fjelde, I. and Surguchev, L., “Simulation Aspects of the CO2 EOR including foam”, paper presented at 15th European Symposium on Improved Oil Recovery, Paris, France, 27 - 29 April 2009.

Dugstad, Ø,  Opel, K. and Fjelde, I., “Improved understanding of CO2/Foam EOR techniques by aid of  Tracer Technology”, paper  SPE-142985, presented at the SPE EUROPEC/EAGE Annual Conference and Exhibition held in Vienna, Austria, 23–26 May 2011.

Evje S. and Hiorth, A., ”A mathematical model for dynamic wettability alteration controlled by water-rock chemistry”, networks and heterogeneous media ,Volume 5, Number 2, June 2010.

Evje S. and Hiorth, A., “A mathematical model relevant for weakening of chalk reservoirs due to chemical reactions”, Networks and heterogeneous media , Volume 4, Number 4, December 2009.

Evje, S. and Hiorth, A: ” A model for interpretation of brine-dependent spontaneous imbibition experiments”, Advances in Water Resources, 2011

Finjord, J.,  Hiorth, A., a Lad,  U.H. and Skjæveland, S. M.,  “NMR for equilateral triangular geometry under conditions of surface relaxivity – analytical and random walk solution”,  Transport Porous Media (2007) 69:33-53.

Fjelde, I.,  “Sulfate in rock samples from carbonate reservoirs”, SCA 2008-A5, prepared for presentation at SCA Symposium, Abu Dhabi, 29 Oct.-2 Nov. 2008.

Fjelde, I., Zuta, J.F. and Hauge, I.,”Retention of CO2-foaming agents onto chalk: Effects of surfactant structure, temperature, and residual oil saturation”, Paper SPE 113259, presented at SPE IOR symposium, Tulsa, 19-23 April, 2008.

Fjelde, I., Zuta, J.F. and Duyilemi, O. V., “Oil Recovery from Matrix during CO2-foam flooding of Fractured Carbonate Oil Reservoirs", Paper SPE 113880, presented at the Europec /EAGE conference, Rome, 9-12 June, 2008.

Fjelde, I., Aasen, S.M. and  Zuta, J.F., ” Improvement of Spontaneous Imbibition in Carbonate Rocks by CO2-saturated Brine”, paper presented at the 16th European Symposium on Improved Oil Recovery, Cambridge, UK, 12-14 April 2011.

Fjelde, I., Zuta, J.F., and Berenbylum, R. 2011. “Retention of CO2-Foaming Agent in CO2-Foam Flooding of Heterogeneous Carbonate Reservoirs”. SPE-143169. The 2011 Brasil Offshore Conference, Macae, Brazil, 15-17 June.

Fjelde, I. and Asen, S.M., ”Improved Spontaneous Imbibition of Water in Reservoir Chalks,” Paper A17, presented at the 15th European Symposium on Improved Oil Recovery, Paris, France, 27 - 29 April 2009.

Fjelde, I., Zuta, J.F. and Kvæstad, A.H.: “Transport of Surfactants in Fractured Chalk Rock – Laboratory Experiments and Numerical Simulations” presented at The Int. Symposium of the Society of Core Analysts, August 27-30, 2012, Aberdeen, Scotland, UK

Frette, O.I. and  Helland, J.O., “A semi-analytical model for computation of capillary entry pressures and fluid configurations in uniformly-wet pore spaces from 2D rock images”, Preprint submitted to Advances in Water Resources, 2010.

Frette, O.I., Virnovsky, G. and Silin, D., "Estimation of the curvature of an interface from a digital 2D image", Computational Materials Science, 44 (2009) 867-875.

Helland J.O. and Frette, O.I., “Computation of fluid configurations and capillary pressures in mixed-wet 2d pore spaces from rock images”, paper presented at the XVIII International Conference on Water Resources, CMWR 2010, Barcelona, 2010.

Helland, J.O, Ryazanov, A.V. and Dijke, M.J.J., “Characterization of pore shapes for pore network models”, paper presented at the ECMOR conference in Bergen, Sept. 8-11, 2008.

Helland J.O. and Skjæveland, S.M., “Physically-Based Capillary Pressure Correlation For Mixed-Wet Reservoirs from a Bundle-Of-Tubes Model”, paper SPE 89428, presented at the 2004 SPE/DOE Fourteenth Symposium on Improved Oil Recovery held in Tulsa, Oklahoma, U. S. A., 17–21 April 2004.

Helland J.O. and Skjæveland, S.M, “Three-Phase Capillary Pressure Correlation For Mixed-Wet Reservoirs”, paper SPE 92057, presented at the 2004 SPE International Petroleum Conference in Mexico held in Puebla, Mexico, 8–9 November 2004.

Helland J.O. and Skjæveland, S.M, ”Three-Phase Mixed-Wet Capillary Pressure Curves From A Bundle-Of-Triangular-Tubes Model”, presented at the 8th International Symposium on Reservoir Wettability, Houston, May 16-18, 2004.

Helland, J.O., Jettestuen, E., Hatzignatiou, D. and Silin, D.: “Three-dimensional level set modelling of capillary-controlled displacements in digital porous media” presented at 2011 AGU Fall Meeting, American Geophysical Union,  December 5-9, 2011 San Francisco, California, USA

Hildebrand-Habel, T., Virnovsky, G.A., Frette, O.I. and Fjelde, I., “SEM imaging of dry and saturated porous rock for modeling fluid distribution”, paper presented at the International Symposium of the Society of Core Analysts held in Calgary, Canada, 10-13 September, 2007.

Hildebrand-Habel, T., Læknes, T. K., Korsnes, R. I., Megawati, Hiorth, A. and Madland, M. V., 2011. Waterflooding experiments on chalk: rock-fluid interaction as revealed by scanning electron microscopy. NGF Abstracts and Proceedings, Vinterkonferansen 2011: 39

Hiorth, A., Cathles, L.M. and  Madland, M.V., “The impact of pore water chemistry on carbonate surface charge and oil wettability”, Transport in Porous Media (2009).

A., Hiorth, L. M. Cathles, M. V. Madland. The impact of pore water chemistry on carbonate surface charge and oil wettability, Trans. Porous Med. 10.1007/s11242-010-9543-6 (2010)

Hiorth, A., Cathles, L.M., et al., "A chemical model for the seawater-CO2-carbonate system - aqueous and surface chemistry", SCA2008 52, presented at the International Symposium of the Society of Core Analysts held in Abu Dhabi, UAE 29 October-2 November, 2008.

Hiorth, A., Cathles, L.M., et al., "Chemical modelling of wettability change in carbonate rocks”, presented at  the Wettability Conference held in Abu Dhabi, UAE 27-28 October, 2008.

Hiorth, A., Kaster, K., Lohne, A., Siqveland, O.K., Berland, H., Giske, N.H. and Stavland, A.,  ”Microbial enhanced oil recovery – Mechanism”, presented at the International Symposium of the Society of Core Analysts held in Calgary, Canada, 10-13 September, 2007.

Hiorth, A., a Lad, U.H., Evje, S. and Skjæveland, S.M., “A Lattice Boltzmann-BGK algorithm for a diffusion equation with Robin boundary condition - application to NMR relaxation”, Journal for Numerical Methods in Fluids, 2000, 2008.

Hiorth, A., a Lad, U.H., Finjord, J. and Skjæveland, S.M., “Magnetic signal from geometries containing corners – analytical and random walk calculations”, abstract presented at the 8th International Bologna Conference on Magnetic Resonance in Porous Media, 2006.

A. Hiorth, Ø. Bache, E. Jettestuen, L. M. Cathles, R. W. Moe, E. Omdal, R. I. Korsnes, M. V. Madland, “A Simplified Approach to Translate Chemical Alteration in Core Experiments to Field Conditions”. Rev Proc. Society of Core Analysts 53 (2011)

Hiorth A., and Virnovsky, G., “A Model for Wettability Change in Reservoir Rock”, presentation at the International Symposium of the Society of Core Analysts, Abu Dhabi, UAE, 5-9 October, 2004.

Jettestuen, E., Helland, J.O. and Prodanović, M.: “A variational level set method for simulation of capillary-controlled displacements”, presented at XIX International Conference on Computational Methods in Water Resources (CMWR 2012), June 17-22, 2012, Urbana, Illinois, USA

Kaster , K.M.,  Bonaunet, K., Berland, H., Kjeilen-Eilertsen, G., and Brakstad , O.G., “Characterisation of Culture-Independent and -Dependent Microbial Communities in a High-Temperature Offshore Chalk Petroleum Reservoir”,  Antonie van Leeuwenhoek International Journal of General and Molecular Microbiology, 2008.

Kaster , K.M.,  Bonaunet, K., Berland, H., Kjeilen-Eilertsen, G., and Brakstad , O.G.,, “Culture Dependant and Independent Characterization of the Microbial Community in the Ekofisk Oil Reservoir”, poster N-238 presented at the American Society of Microbiology 107th General Meeting, Toronto Canada May 21-25 2007.

Kaster, K.M., Hiorth, A., Berland, H. and  Brakstad, O.G., “Biofilms - a possible mechanism of enhanced oil recovery”,  poster presented at Thermophiles Conference  Bergen, Norway Sept. 24-27 2007.

Kaster, K.M., Hiorth, A., Kjeilen-Eilertsen, G., Boccadoro, C., Lohne, A., Berland, H., Stavland A. and Brakstad, O.G., ” Microbial Enhanced Oil Recovery - A Mechanistic Study”, Transport in porous media, 2008.

Kaster, K.M., Grigoriyan, A., Jenneman, G. and Voordouw, G., ”Effect of nitrate and nitrite on sulfide production by two thermophilic, sulfate-reducing enrichments from an oil field in the North Sea”, Applied Microbiology and Biotechnology, Springer Berlin / Heidelberg, pages 195-203, Volume 75, Number 1, May 2007.

Kaster, K.M., Hiorth, A., Kjeilen-Eilertsen, G., Boccadoro, K., Lohne, A., Berland, H.,
Stavland, A. and Brakstad, O.G.: “Mechanisms Involved in Microbially Enhanced Oil Recovery” Transport in Porous Media, 2011

Kolnes, J., Hiorth, A., Siqveland, O.K.,  Omdal, E., Zangiabadi, B. and Madland, M.V., “Contact angle  measurements on calcite using model oils”, paper presented at the 10th Wettability Conference, October 27-28, 2008, Abu Dhabi.

Korsnes, R.I., “Chemical induced water weakening of chalk by fluid-rock interactions. A mechanistic study”, PhD Thesis, UiS, 2007.

Korsnes, R., Madland, M.V. and Austad, T., “Impact of brine composition on the mechanical strength of chalk at high temperature”, Eurock 2006, Multiphysics Coupling and Long Term Behaviour in Rock Mechanics, Eds. Cottheim, A.V., Charlier, R., Thimus, J.F. and Tshibangu, J.P., Taylor & Francis, London, pp. 133-140.

Korsnes, R.I., Madland, M.V., Vorland, K.A.N, Hildebrand-Habel, T., Kristiansen, T.G. and Hiorth, A., “Enhanced chemical weakening of chalk due to injection of co2 enriched water”, paper SCA 2008-24, presented at the International Symposium of the Society of Core Analysts held in Abu Dhabi, UAE 29 October-2 November, 2008.

Korsnes, R., Madland, M.V., Austad, T., Haver, S. and Røsland, G., “The effects of temperature on the water weakening of chalk by seawater”, Journal of Petroleum Science and Engineering. In press, Available online 21 June 2007.

Korsnes, R.I., Risnes, R., Faldaas I. and  Norland,  T., “Measurements on Stress Dependent Permeability”, Tectonphysics, 2005.

Korsnes, R.I., Strand, S., Hoff, Ø, Pedersen, T., Madland M.V. and Austad, T., ”Does the chemical interaction between seawater and chalk affect the mechanical properties of chalk?”, Eurock 2006, Multiphysics Coupling and Long Term Behaviour in Rock Mechanics, Eds. Cottheim, A.V., Charlier, R., Thimus, J.F. and Tshibangu, J.P., Taylor & Francis, London, pp. 427-434.

a  Lad, U.H., Aksel Hiorth, A., Finjord, J. and Skjæveland, S.M., ”Two-phase random walk simulation of NMR magnetic decay in equilateral, triangular pores and a corresponding correlation”, The 22nd International Symposium of the Society of Core Analysts, Abu Dhabi, U.A.E, 29th October to 2nd November 2008.

a  Lad, U.H., Aksel Hiorth, A., Finjord, J. and Skjæveland, S.M., “Two-phase simulation and correlation of nmr magnetic decay in equilateral triangular pores”,  paper SCA2008-51, presented at the International Symposium of the Society of Core Analysts held in Abu Dhabi, UAE 29 October-2 November, 2008.

a  Lad, U.H., Aksel Hiorth, A., Siqveland, O.K. and Skjæveland, S.M., ”Revisiting two phase NMR data with a new inversion routine using a triangular pores model for wettability estimation”, paper SCA2009-24, presented at the International Symposium of the Society of Core Analysts held in Noordwijk, The Netherlands 27-30 September, 2009.

a  Lad, U.H., Kolnes, J., Siqveland, O.K., Hiorth, A. and Skjæveland, S.M., ”Improved method for measuring surface relaxivity”, SCA2005-48, paper presented at the 2005 International Symposium of the Society of Core Analysts, Toronto, Canada, Aug. 22-25, 2005.

Madland, M.V., Hiorth, A., Korsnes, R.I., Evje, S. and Cathles, L., “ Rock Fluid Interactions in Chalk exposed to Injection of Seawater, MgCl2, and NaCl2 Brines with equal Ionic Strength”, presented at the 15th European Symposium on Improved Oil Recovery — Paris, France, 27 – 29 April 2009.

Madland, M.V., Midtgarden, K, Manafov, R., Korsnes, R.I., Kristiansen, T.G., Hiorth, A., “The effect of temperature and brine composition on the mechanical strength of Kansas chalk”, paper SCA2008-55, presented at the International Symposium of the Society of Core Analysts held in Abu Dhabi, UAE 29 October-2 November, 2008.

Madland, M.V., Midtgarden, K, Manafov, R., Korsnes, R.I., Zangiabadi, B, Kristiansen, T.G. and Hiorth, A., “The effect of temperature and brine composition on the mechanical strength of Kansas chalk”, The 22nd International Symposium of the Society of Core Analysts, Abu Dhabi, U.A.E, 29th October to 2nd November 2008.

Madland, M.V., Omdal, E., Breivik, H., Korsnes, R.I., Hiorth, A. and Kristiansen, T.G. “Investigation of the Effective Stress Relations for Outcrop Chalk”, paper presented at the Fourth Biot Conference on Poromechanics, June 8-10, 2009, New York.

Madland, M.V., Vorland, K.A.N, Korsnes, R.I., Zangiabadi, B, Kristiansen, T.G., and Hiorth, A., “Enhanced chemical weakening of chalk due to injection of CO2 enriched water”, The 22nd International Symposium of the Society of Core Analysts, Abu Dhabi, U.A.E, 29th October to 2nd November 2008.

Megawati, M., Hiorth, A. and Madland, M.: «The Impact of Surface Charge on the Mechanical Behavior of High-Porosity Chalk”, Rock Mech Rock Eng DOI 10.1007/s00603-012-0317-z 2012

Megawati, M., Hiorth, A., Siqveland, O.K., Korsnes, R.I., Kristiansen, T.G. and Madland, M.V., “Pore-water Distribution from NMR to Study Water-induced Compaction in High-porosity Chalk”, paper presented at the 15th European Symposium on Improved Oil Recovery, Paris, France, 27 – 29 April 2009.

Omdal, E., Breivik, H., Næss, K.E., Ramos, R., Kristiansen, T.G., Korsnes, R.I., Hiorth, A. and Madland, M.V., “Experimental Investigation of the Effective Stress Coefficient for various Outcrop Chalk.”, paper SCA2008 A45, presented at the 22nd International Symposium of the Society of Core Analysts, Abu Dhabi, U.A.E, 29th October to 2nd November 2008.

Omdal, E., Dirdal, E., Ormark, K., Vorland, K.A.N., Knutsen Læknes, T., Hildebrand-Habel, T., Kristiansen, T.G. and  Madland, M.V., “Induced geometry in chalk during hydrochloric acid stimulation,” paper presented at GeoProc 2008 (3rd International Conference on Coupled T-H-M-C (thermal, hydraulic, mechanical, chemical) Processes in Geosystems), Lille, France, June 2—6 2008.

Omdal, E., Madland, M.V., Renli, R., Kristiansen, T.G., Hiorth, A., Korsnes, R.I. and Hildebrand-Hadel, T., “Laboratory Observation with Implications for Depletion of Chalk Reservoirs”, paper presented at the Fourth Biot Conference on Poromechanics, June 8-10, 2009, New York.

Papatzacos, P. and Skjæveland, S.M., ”Imbibition Relative Permeabilities from the Diffuse-Interface Theory”, presented at Oil Recovery-2003, the first International Conference and Exhibition, Russian State Oil and Gas Gubkin University, Moscow, May 19-23, 2003.

Papatzacos, P. and Skjæveland, S.M, “Mixed-Wet Drainage and Imbibition Relative Permeabilities From the Diffuse Interface Theory”, paper SPE 84546, presented at the SPE Annual Technical Conference and Exhibition held in Denver, Colorado, 5–8 October 2003.

Papatzacos, P. and Skjæveland, S.M, “Relative Permeability From Capillary Pressure”, paper SPE 77540, presented at the SPE Annual Technical Conference and Exhibition held in San Antonio, Texas, 29 September-2 October 2002.

Puntervold, T. and Austad, T., “Injection of seawater and mixtures with produced water into North Sea chalk formation: Impact of fluid-rock interactions on wettability and scale formation”, submitted for publication in Journal of Petroleum Science and Engineering.

Puntervold, T., Strand, S. and Austad, T., “Water flooding of carbonate reservoirs: Effects of a model base and natural crude oil bases on chalk wettability”, Energy and Fuels 2007, 21 (3): 1606-1616.

Puntervold, T., Strand, S. and Austad, T., “Co-injection of seawater and produced water to improve oil recovery from fractured North Sea chalk oil reservoirs”, submitted for publishing in Journal of Petroleum Science and Engineering.

Puntervold, T., Strand, S. and Austad, T., “New method to prepare outcrop chalk cores for wettability and oil recovery studies at low initial water saturation”, Energy and Fuels 2007, 21 (6): 3425-3430.

Risnes, R., Haghighi, H., Korsnes, R.I. and Natvik, O., “Chalk–fluid interactions with glycol and brines”, Tectonophysics 370 (2003) 213– 226.

Strand, S., Hjuler, M.L., Torsvik, R., Pedersen, J.I., Madland, M.V. and Austad, T., ”Wettablity of chalk: Impact of silica, clay content, and mechanical properties”, Petroleum Geoscience 2007, 13: 69-80.

Shchipanov, A.,  Kollbotn, L., Surguchev, L.M. and Thomas, K.O.,  “A New Approach to Deformable Fractured Reservoir Characterization: Case Study of the Ekofisk Field, paper SPE 130425, presented at the SPE EUROPEC/EAGE Annual Conference and Exhibition held in Barcelona, Spain, 14–17 June 2010.

Shchipanov, A .and Rusakov, S.V., “Transient pressure well test analysis based on compressible discrete fracture network”, prepared for presentation at the ECMOR conference in Bergen, Sept. 8-11, 2008.

Strand, S., Austad, T., Puntervold, T., Høgnesen, E.J., Olsen, M. and Barstad, S.M.F., “Smart water" for oil recovery from fractured limestone - A preliminary study”, submitted for publishing in Energy and Fuels.

Strand, S., Puntervold, T. and Austad, A., “Effect of temperature on enhanced oil recovery from mixed-wet chalk cores by spontaneous imbibition and forced displacement using seawater”, submitted for publication.

Strand, S., Austad, T., Puntervold, T., Høgnesen, E.J., Olsen, M. and Barstad, S.M.F, “’Smart Water’ for oil recovery from fractured limestone: A preliminary study”, submitted for publication.

Surguchev, L., Giske, N.H., Kollbotn, L. and Schipanov, A., ”Cyclic water injection improves oil production in carbonate reservoir”, SPE paper 117836, prepared for presentation at the International Petroleum Technology Conference, 3-6 November 2008, Abu Dhabi, UAE.

Tweheyo, M.T., Zhang, P. and Austad, T., “The effects of temperature and potential determining ions present in seawater on oil recovery from fractured carbonates”, SPE 99438, presented at the 2006 SPE/DOE Symposium on Improved Oil Recovery, Tulsa, 22-26 April 2006.

Virnovsky, G.A., Vatne, K.O., Iversen, J.I. and Signy, C., “Three-Phase Capillary Pressure Measurements in Centrifuge at Reservoir Conditions”, presented at the International Symposium of the Society of Core Analysts held in Abu Dhabi, UAE, 5-9 October, 2004.

Virnovsky, G.A., Lohne, A., and Frette, O.I., "Modeling capillary pressure using capillary bundles with arbitrary cross-sections obtained from photomicrographs," Journal of Petroleum Science and Engineering 69 (2009) 117-128.

Virnovsky, G.A., Lohne, A., and Lerdahl, T., "Coarse scale Capillary Pressure in Heterogeneous Reservoirs”, Transport of porous media, Springer Netherlands, Volume 75, Number 3 / December, 2008, p275-294

Zangiabadi, B., Davidian, T.A., Havik, V.H., Korsnes, R.I., Vorland, K.A.N., Kristiansen, T.G. and Madland, M.V., “The effect of wetting conditions on the mechanical strength of chalk”, paper presented at GeoProc 2008 (3rd International Conference on Coupled T-H-M-C (thermal, hydraulic, mechanical, chemical) Processes in Geosystems, Lille, France, June 2—6 2008.

Zangiabadi, B., Korsnes, R.I. and Madland, M.V., Hildebrand-Habel, T., Hiorth, A., and Kristiansen, T.G., “Mechanical Properties of High and Lower Porosity Outcrop Chalk atVarious Wetting States”, paper ARMA 09-139, presented at Asheville 2009, the 43rd US Rock Mechanics Symposium and 4th U.S.-Canada Rock Mechanics Symposium, held in Asheville, NC June 28th – July 1,2009.

Zangiabadi, B., Korsnes, R.I, Sutarjana, K., Torgersen, A., Hiorth, A., and Madland, M.V., “Chemical water weakening of various outcrop chalks at elevated temperature”, paper presented at the Fourth Biot Conference on Poromechanics, June 8-10, 2009, New York.

Zhang, P. and Austad, T., “The Relative Effects of Acid Number and Temperature on Chalk Wettability”, paper SPE 92999, presented at the 2005 SPE International Symposium on Oilfield Chemistry held in Houston, Texas, U.S.A., 2 – 4 February 2005.

Zhang, P. and Austad, T, “Waterflooding in chalk: Relationship between oil recovery, new wettability index, brine composition and cationic wettability modifier”, paper SPE 94209, presented at the 14th Europec Biennial Conference held in Madrid, Spain, 13-16 June 2005.

Zhang, P. and Austad, T, “Wettability and oil recovery from carbonates: Effect of temperature and potential determining ions”, Colloids and Surfaces A: Physicochem. Eng. Aspects 2006, 279: 179-187.

Zhang, P., Tweheyo, M.T. and Austad, T., “Wettability alteration and improved oil recovery by spontaneous imbibition of seawater into chalk: Impact of the potential determining ions: Ca2+, Mg2+, and SO42-“, Colloids and Surfaces A: Physicochem. Eng. Aspects 2007, 301: 199-208.

Zhang, P., Tweheyo, M.T. and Austad, T., “Wettability alteration and improved oil recovery in chalk: The effect of calcium in the presence of sulfate”, Energy and Fuels 2006, 20: 2056-2062.”, paper SPE 121253, presented at the 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition held in Amsterdam, The Netherlands, 8–11 June 2009.

Zhou, Y., Helland, J.O. and Hatzignatiou, D.: “A model for imbibition in pore spaces from 2D rock images - extended abstract” presented at International Conference on Flows and Mechanics in Natural Porous Media from Pore to Field Scale - Pore2Field, IFP Energies nouvelles, Nov. 16-18, 2011, Rueil-Malmaison, France

Zhou, Y. and Helland, J.O.: “Dynamic Capillary Pressure Curves from Porescale Modelling in Mixed-wet Rock Images” presented at 74th EAGE Conference & Exhibition incorporating SPE EUROPEC 2012, June 4-7, 2012, Copenhagen, Denmark

Zhou, Y., Helland, J.O. and Hatzignatiou, D.: “A dimensionless capillary pressure function for imbibition derived from pore-scale modelling in mixed-wet rock image”, presented at SPE Improved Oil Recovery Symposium, April 14-18, 2012, Tulsa, Oklahoma, USA

Zhou, Y., Helland, J.O. and Hatzignatiou, D.: “Pore-scale modelling of water flooding in mixed-wet rock images: effects of initial saturation and wettability”, presented at SPE Improved Oil Recovery Symposium, April 14-18, 2012, Tulsa, Oklahoma, USA

Zuta, J.F.  and Fjelde, I., “Transport of CO2-Foaming Agents during CO2-Foam Processes in Fractured Chalk Rock”, paper SPE 121253, presented at the 2009 SPE EUROPEC/EAGE Annual Conference and Exhibition held in Amsterdam, The Netherlands, 8–11 June 2009.

Zuta, J.F. and Fjelde, I., “Wettability alteration due to retention of CO2-foaming agents onto chalk rock”, paper SCA 2008-A18, prepared for poster presentation at SCA Symposium, Abu Dhabi, 29 Oct.-2 Nov. 2008.

Zuta, J.F., Fjelde, I. and Berenbylum, R., “The stability of pre-formed foam and the effect of gravity forces on oil recovery during CO2-foam processes in fractured chalk rock”, paper presented at 16th European Symposium on Improved Oil Recovery, Cambridge, UK, 12-14 April 2011.

Zuta, J.F., Fjelde, I., and Berenbylum, R., “Oil recovery during co2-foam injection in fractured chalk rock at reservoir conditions”, paper SCA2009-27, presented at the International Symposium of the Society of Core Analysts held in Noordwijk, The Netherlands 27-30 September, 2009.

Zuta, J.F., Fjelde, I., Berenbylum, Vartdal, R., Hogne, L., and Ovesen, H., ”Modeling of Transport of a CO2-Foaming agent during CO2-Foam Processes in Fractured Chalk Rock”, paper SPE 129601, presented at the 2010 SPE Improved Oil Recovery Symposium held in Tulsa, Oklahoma, USA, 24–28 April 2010.

Zuta, J.F.,  Fjelde, I., and Berenbylum, R, “Experimental and Simulation of CO2-Foam Flooding in Fractured Chalk Rock at Reservoir Conditions: Effect of Mode of Injection on Oil Recovery”, paper SPE 129575, presented at the SPE EOR Conference at Oil & Gas West Asia held in Muscat, Oman, 11–13 April 2010.

Zuta, J.F., Fjelde, I. 2011. “Mechanistic Modeling of CO2-Foam Processes in Fractured Chalk Rock: Effect of Foam Stability and Gravity Forces on Oil recovery.” SPE-144807. SPE Enhanced Oil Recovery Conference (EORC), Kuala Lumpur, Malaysia, 19-21 July.

Zuta, J.F.,  Fjelde, I. and Maqsad, A., ” CO2-Foam Processes in a Fractured Chalk Model”, paper presented at the 15th European Symposium on Improved Oil Recovery, Paris, France, 27-29 April 2009.

Yu, L., Evje, S., Fjelde, I., Kleppe, H., Kårstad, T. and Skjæveland, S.M.,”Modeling of wettability alteration processes in carbonate oil reservoirs”, Network and Heterogeneous Media,Vol 3 (1), 2008.

Yu, L., Evje, S., Kleppe, H., Kårstad, T., Fjelde, I. and Skjæveland, S.M., ”Analysis of the wettablility alteration process during seawater imbibition into preferentially oil-wet chalk cores”, paper SPE 113304, presented at SPE IOR symposium, Tulsa, 19-23 April, 2008.

Yu, L., Evje, S., Kleppe, H., Kårstad, T., Fjelde, I., and Skjæveland, S. M.,”Spontaneous imbibition of seawater into preferentially oil-wet chalk cores - Experiments and simulations.” Journal of Petroleum Science and Engineering 66, 2009, 171-179
+47 51 87 50 00
+47 51 87 52 00

E-mail address: corec@iris.no
Phone:
Fax:

P. O. Box 8046, 4068 Stavanger, Norway
Prof. Olav Hanssensvei 15, 4021 Stavanger

Mailing address:
Visiting address:
COREC - CENTER FOR OIL RECOVERY