Karen Schou Pedersen

Managing Director & Senior Principal Consultant


Phone: +45 45 87 66 46


  • Danish Engineering Society's “Chemical Engineering Award”, 1985.
  • SPE Anthony F. Lucas Gold Medal, 2017


Aoki, T., Furuta, T., Leekumjorn, S., Azeem, J.S., Pedersen, K.S, Alobeidli, A., Mogensen, K.
A New Technique for Common EoS Model Development for Multiple Reservoir Fluids with Gas injection.
SPE-202923-MS, Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, November 9-12, 2020.

Boesen, R.R., Sørensen, H. and Pedersen, K.S.
Asphaltene Predictions Using Screening Methods and Equations of State
SPE 190401-MS, SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 26-28 March 2018

Tybjerg, P., Pedersen, K.S. and Krejbjerg, K.,
Reservoir Fluid Characterization Procedure for PC-SAFT Equation of State
SPE 187170-MS, SPE ATCE, San Antonio, Texas, 9-11 October 2017.

Meisingset, K.K. and Pedersen, K.S.,
Joule-Thomson Coefficient from Well Test Analysis Data
SPE-181622-MS, SPE ATCE in Dubai, UAE, 26–28 September 2016.

Kumar, A., Gohary, M.E., Pedersen, K.S, and Azeem, J.,
Gas Injection as an Enhanced Recovery Technique for Gas Condensates. A comparison of three Injection Gases
SPE 177778-MS, Abu Dhabi International Petroleum Exhibition and Conference. UAE, 9-12 November, 2015.

Pedersen, K.S. and Hjermstad, H.P.
Modeling of Compositional Variation with Depth for Five North Sea Reservoirs
SPE 175085-MS, SPE ATCE Houston, Tx, September 28-30, 2015.

Hustad, O. S., Jia, N.J., Pedersen, K.S., Memon, A., Leekumjorn, S.
High Pressure Data and Modeling Results for Phase Behavior and Asphaltene Onsets of GoM Oil Mixed with Nitrogen
SPE Reservoir Eval. Eng. 3, 2014, pp. 384-395.

Pedersen, K.S., Christensen, P.L., Azeem, J.
Phase Behavior of Petroleum Reservoir Fluids, 2nd edition
Taylor & Francis, Boca Raton, US, 2014

Boesen, R.R., Sørensen, H. and Pedersen, K.S.
New Approach for Hydrate Flash Calculations
Proceedings of the 8th International Conference on Gas Hydrates (ICGH8-2014), Beijing, July 28th – August 1st, 2014

Lindeloff, N.L., Mogensen, K., Pedersen, K.S., Tybjerg, P., Noman, R.
Investigation of Miscibility Behavior of CO2 rich Hydrocarbon Systems – With Application for Gas Injection EOR
SPE 166270-MS, SPE Annual Technical Conference and Exhibition, New Orleans, LA, USA, 30 September–2 October 2013

Sørensen, H., Pedersen, K.S., Christensen, P.L.
Method for Generating Shale Gas Fluid Composition from Depleted Sample
Presented at Forth International Acid Gas Injection Symposium (AGIS IV), Calgary, September 24 – 27, 2013

Pedersen, K.S., Leekumjorn, S., Krejbjerg, K. and Azeem, J.
Modeling of EOR PVT data using PC-SAFT equation
SPE-162346-PP , Abu Dhabi International Petroleum Exhibition & Conference, Abu Dhabi, UAE, 11–14 November, 2012

Pedersen, K.S., Azeem, J. and Rasmussen, C.P.
1D asphaltene deposition simulator for reservoir fluids undergoing gas injection
SPE-155447-PP, SPE EOR Conference at Oil and Gas West Asia, Muscat, Oman, 16–18 April 2012

Sah, P., Gurdial,G., Pedersen, K.S., Izwan,H., and Ramli, F.
Equation-Of-State Modeling For Reservoir Fluid Samples Contaminated By Oil-Based Drilling Mud Using Contaminated Fluid PVT Data
SPE Reservoir Evaluation & Engineering, 15, 2012, pp. 139-149

Larsen, J., Sørensen, H., Yang, T., Pedersen, K. S.
EOS and Viscosity Modeling for a highly undersaturated Gulf of Mexico Reservoir Fluid
SPE-147075-PP,SPE ATCE, 30 October – 2 November 2011, Denver, Co

Sah, P., Pedersen, K. S., and Shaikh, J.A.
EOS modelling, the first step in detailed EOR potential evaluation – A case study
SPE-144025, EORC, Kuala Lumpur, Malaysia. July 19-21, 2011

Hemmingsen, P.V., Burgass, R., Pedersen, K. S., Kinnari, K. and Sørensen, H.,
Hydrate temperature depression of MEG solutions at concentration up to 60 wt%. Experimental data and simulation results
Fluid Phase Equilibria 307, 2011, pp. 175-179

Negahban, S., Pedersen, K. S., Baisoni, M.A., Sah, P., and Azeem, J.
An EOS Model for a Middle East Reservoir Fluid with an Extensive EOR PVT Data Material,
SPE-136530-PP, Abu Dhabi International Petroleum Exhibition & Conference in Abu Dhabi, UAE, November 1-4, 2010

Sonne, J., Pedersen, K.S.
Simulation of Hydrate Growth in Steady State Flow Lines
BHR 14th International Conference on Multiphase Production Technology, Cannes, France, June 17 – 19, 2009.

Pedersen, K.S. and Sørensen, C.H.
PC-SAFT Equation of State Applied to Petroleum Reservoir Fluids
SPE-110483-PP, SPE ATCE, Anaheim. November 11-14, 2007

Pedersen, K.S., Christensen, P.L.
Fluid in Hydrocarbon Basins
Chapter in Reviews in Mineralogy & Geochemistry, Vol 65, Mineralogical Society of America Geochemical Society, 2007.

Pedersen, K.S., Hjermstad, H.P.
Modeling of Large Hydrocarbon Compositional Gradient
SPE 101275, Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, November 5-8, 2006.

Lundstrøm, C., Michelsen, M.L., Kontogeorgis, G.M., Pedersen, K.S. and Sørensen, H.
Comparison of SRK and CPA Equations of State for Physical Properties of Water and Methanol
Fluid Phase Equilibria 247, 2006, pp. 149-157

Pedersen, K.S., Christensen, P.L.
Phase Behavior of Petroleum Reservoir Fluids
Taylor & Francis, Boca Raton, US, 2006.

Krejbejrg, K., Pedersen, K.S..
Controlling VLLE Equilibrium with a Cubic EOS in Heavy Oil Modeling
Presented at the Petroleum Society’s 7th Canadian International Petroleum Conference Calgary, Canada, June 13 – 15, 2006.

Pedersen, K.S., Milter, J.
Phase Equilibrium Between Gas Condensate and Brine at HT/HP Conditions
SPE 90309, SPE ATCE, Houston, TX, September 26-29, 2004

Lindeloff, N., Pedersen, K.S., Rønningsen, H. P., Milter, J.
The Corresponding States Viscosity Model Applied to Heavy Oil Systems
Journal of Canadian Petroleum Technology 43, 2004, pp. 47 – 53.

Pedersen, K.S., Milter J., Sørensen, H.
Cubic Equations of State Applied to HT/HP and Highly Aromatic Fluids
SPE Journal 9, 2004, pp. 186-192

Pedersen, K.S., Rønningsen, H.P.
Influence of Wax Inhibitors on Wax Temperature, Pour Point, and Viscosity of Waxy Crude Oils
Energy and Fuels 17, 2003, pp. 321-328

Pedersen, K.S., Lindeloff, N.
Simulations of Compositional Gradients in Hydrocarbon Reservoirs under the Influence of a Temperature Gradient
SPE 84364, SPE ATCE, Denver, Co. Oct. 5 – 8, 2003

Rasmussen, C.P., Pedersen, K.S.
Challenges in Modeling of Gas Hydrate Phase Equilibria
4th International Conference on Gas Hydrates, Yokohama, May 19-23, 2002

Sørensen, H., Pedersen, K.S., Christensen, P.L.
Modeling of Gas Solubility in Brine
Organic Geochemistry 33, 2002, pp. 635-642

Pedersen, K.S., Milter, J., Rasmussen, C.P.
Mutual Solubility of Water and a Reservoir Fluid at High Temperatures and Pressures. Experimental and Simulated data
Fluid Phase Equilibria 189, 85-97, 2001

Pedersen, K.S., Rønningsen, H.P.
Effect of Precipitated Wax on Viscosity – a Model for Predicting the non-Newtonian Viscosity of Crude Oils
Energy and Fuels 14, 2000, pp. 43-51

Madsen, J., Pedersen, K. S., Michelsen, M.L.
Modeling of Structure H Hydrates using a Langmuir Adsorption Model
Ind. Eng. Chem. Res. 39, 2000, 1111-1114

Aplin, A.C., Macleod, G., Larter, S. R., Pedersen, K.S., Sørensen, H., Booth, T.
Combined use of confocal laser scanning microscopy and PVT simulation for estimating the composition and physical properties of petroleum in fluid inclusions
Marine and Petroleum Geology 16, 1999, pp. 97-110

Rønningsen, H.P., Sømme, B., Pedersen, K.S.
An Improved Thermodynamic Model for Wax Precipitation: Experimental Foundation and Application
Multiphase 97 Conference, June 18-20, 1997, Cannes, France.

Rydahl, A., Pedersen, K.S., Hjermstad, H.P.
Modelling of Live Oil Asphaltene Precipitation
AIChE Spring National Meeting, March 9-13, 1997, Houston, Tx, USA.

Pedersen, K.S., Michelsen, M.L., Fredheim, A.O
Phase Equilibrium Calculations for Unprocessed Well Streams Containing Hydrate Inhibitors
Fluid Phase Equilibria 126, 1996, pp. 13-28.

Pedersen, K.S.
Prediction of Cloud Point Temperatures and Amount of Wax Precipitation
SPE Production & Facilities, February 1995, pp. 46-49

Skovborg P., Ng, H.J., Rasmussen, P., Mohn, U.,
Measurement of induction times for the formation of methane and ethane gas hydrates
Chem. Eng. Sci. 48, 1993, pp. 445-453.

Pedersen, K.S., Blilie, A.L., Meisingset, K.K.,
PVT-Calculations on Petroleum Reservoir Fluids Using Measured and Estimated Compositional Data for the Plus-Fraction
Ind. Eng. Chem. Res. 31, 1992, pp. 1378-1384.

Guo, T. M., Du, L.G., Fredenslund, Aa., Pedersen, K.S.
Application of the Du-Guo and SRK Equations of State to Predict the Phase Behavior of Chinese Reservoir Fluids
SPE Reservoir Engineering, August 1991, pp. 379-388

Skovborg, P., Rønningsen, H.P., Pedersen, K.S.
Wax Precipitation from North Sea Crude Oils. 4. Thermodynamic Modeling
Energy and Fuels 5, 1991, pp. 924-932.

Pedersen, K.S., Fredenslund, Aa., Thomassen, P.
Properties of Oils and Natural Gases
Gulf Publishing Inc., Houston, 1989.

Pedersen, K.S., Lund, T., Fredenslund, Aa.
Surface Tension of Petroleum Mixtures
Journal of Canadian Petroleum Technology 28, 1989, pp. 118-123.

Pedersen, K.S., Thomassen, P., Fredenslund, Aa.,
On the Dangers of Tuning Equations of State Parameters
Chem. Eng. Sci. 43, 1988, pp. 269-278.

Hansen, J.H., Rønningsen, H.P., Pedersen, K.S., Fredenslund, Aa
A Thermodynamic Model for Predicting Wax Formation in Crude Oils
AIChE Journal 34, 1988, pp. 1937-1942.

Pedersen, K.S., Fredenslund, Aa.
An Improved Corresponding States Model for the Prediction of Oil and Gas Viscosities and Thermal Conductivities
Chem. Eng. Sci. 42, 1987, pp. 182-186.

Pedersen, K.S., Fjellerup, J., Thomassen, P., Fredenslund, Aa.
Studies of Gas Injection into Oil Reservoirs by a Cell-to-Cell Simulation Model
SPE 15599, SPE ATCE, New Orleans, LA, October 5-8, 1986.

Pedersen, K.S., Thomassen, P., Fredenslund, Aa.
Thermodynamics of Petroleum Mixtures Containing Heavy Hydrocarbons. 3. Efficient Flash Calculation Procedures Using the SRK Equation of State
Ind. Eng. Chem. Process Des. Dev. 24, 1985, pp. 948-954.

Pedersen, K.S., Fredenslund, Aa., Christensen, P.L., Thomassen, P.
Viscosity of Crude Oil
Chem. Eng. Sci. 39, 1984, pp. 1011-1016.

Pedersen, K.S., Thomassen, P., Fredenslund, Aa.
Thermodynamics of Petroleum Mixtures Containing Heavy Hydrocarbons. 1. Phase Envelope Calculations by Use of the Soave-Redlich-Kwong Equation of State
Ind. Eng. Chem. Process Des. Dev. 23, 1984, pp. 163-170.

Pedersen, K.S., Thomassen, P., Fredenslund, Aa.
Thermodynamics of Petroleum Mixtures Containing Heavy Hydrocarbons. 2. Flash and PVT Calculations with the SRK Equation of State
Ind. Eng. Chem.Process Des. Dev. 23, 1984, pp. 566-573.

Pedersen, K.S., Thomassen, P., Fredenslund, Aa.
SRK-EOS Calculation for Crude Oils
Fluid Phase Equilibria 14, 1983, pp. 209-218.


Period Education
1986-1989 B. Com. in financing from Copenhagen Business School, Frederiksberg, Denmark
1977-1980 Ph. D. in physical chemistry from the Department of Physical Chemistry at the Technical University of Denmark
1968-1973 M. Sc. in chemical engineering from the Technical University of Denmark, Kgs. Lyngby, Denmark


Period Employment
1982- Calsep A/S, founder and managing director. Development of PVT software. Consultant within oil and gas phase behavior.
1981-1982 Consultant for Statoil, Norway. Project on characterizing heavy hydrocarbons.
1980-1981 University of Edinburgh, Physics Department (based at Institut Laue Langevin, Grenoble, France), liquid physics studied by neutron scattering.
1977-1980 Department of Physical Chemistry, Technical University of Denmark, Ph. D. study.
1974-1977 Hempel Marine Paints, research and development.


For more information about Calsep office locations, phone and fax numbers, please go to Calsep locations.


Calsep A/S
Headquarter & Europe


Calsep FZ LLC
Middle East


Calsep, Inc.

Kuala Lumpur

Calsep Asia Pacific Sdn Bhd
Asia and Pacific