Kristian Krejbjerg

President, Calsep Inc. & Principal Consultant

Calsep Houston

Phone: +1 281 759 8822

Consulting Services, examples

JIP to develop new PVT technology for unconventional reservoirs (2018 – 2020)
After collection of data, a new method was developed to estimate reservoir fluid compositions based on chemical reaction equilibrium theory and limited data for the reservoir like temperature and pressure.

EoS model for gas condensates (2015)
QC of sampling data and estimation of CGR for gas condensate reservoir fluid based on sampling data. EoS model development for gas condensate field.

EoS model for unconventional fluid with gas injection data (2013)
Development of an EoS model for fluids with gas injection data, for an unconventional reservoir in USA.

EoS model for Eagle Ford fluids (2013)
Development of a single EoS model for ConocoPhillips in the Eagle Ford. The model covered multiple fluids with a wide range of yields.


Leekumjorn, S., Boesen, R.R., Sørensen, H.S, Krejbjerg, K.
Asphaltene Modeling with Cubic and More Complex Equations of State
SPE-203491-MS, Abu Dhabi International Petroleum Exhibition and Conference, Abu Dhabi, UAE, November 9-12, 2020.

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.

Leekumjorn, S. and Krejbjerg, K
Phase Behavior of Reservoir Fluids: Comparisons of PC-SAFT and Cubic Equation of State Simulations,
Fluid Phase Equilibria 359, 2013, pp. 17-23.

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

Hadsbjerg C. and Krejbjerg K.
Challenges in Hydrate Plug Prevention in Pipelines Seen Over the Lifetime of a Field
ASME 2009 28th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2009), 7, 2009, pp. 435-443

Rasmussen, C.P., Krejbjerg, K., Michelsen, M.L., Bjurstrøm, K.E.
Increasing Computational Speed of Flash Calculations with Applications for Compositional, Transient Simulations.
SPE Reservoir Evaluation & Engineering, February 2006, pp. 32-38

Krejbjerg, K. and Pedersen, K.S.
Controlling VLLE Equilibrium with a Cubic EoS in Heavy Oil Modeling
Petroleum Society’s 7th Canadian International Petroleum Conference, Calgary, Alberta, Canada, June 13 – 15, 2006

Krejbjerg, K., Sørensen, H.
A Solution Algorithm for Simulating Hydrate Growth
Fifth International Conference on Gas Hydrates, June 13-16, 2005, Trondheim, Norway

Lindeloff, N., Krejbjerg, K.
A Compositional Model Simulating Wax Deposition in Pipeline Systems
Energy and Fuels, 16, 2002, pp. 892-903

Lindeloff, N., Krejbjerg, K.
Conversion of Multiphase Meter Flowrates
Multiphase '01, June 13-15, 2001, Cannes, France


MBA, Houston Baptist University

M.Sc. in Chemical Engineering, The Technical University of Denmark


Calsep, Inc. Houston, TX.

Calsep A/S, Denmark.


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