Rasmus Risum Boesen

Senior Consultant

Calsep Copenhagen

Phone: +45 45 97 08 13

Typical Consulting Projects

PVT consultant on project involving multiple fields.
Advising on PVT related matters. Quality check of PVT data and evaluation / development of single and common EoS models. Focus on consistent PVT description in reservoir, network and process simulation.

Effect of gas lift on wax deposition in a well.
Carrying out simulations to evaluate the effect of flow rate and lift gas temperature on the outlet temperature and wax deposition in a well. Heat exchange between lift gas and well stream was also investigated.

Reservoir initialization project.
Non-equilibrium initialization of a reservoir grid model based on interpolation / extrapolation of known reservoir fluid samples. The model honors the established depth of a gas-oil-contact and horizontal variation in reservoir fluid composition.

Research Projects

Asphaltene modeling.
Investigating different approaches to modeling asphaltene precipitation. Collecting and analyzing experimental data and presenting at seminars.

Implementing new models in PVTsim.
Coding SRK-CPA / PR-CPA equations of state and extending the PC-SAFT equation with an association term.

Property and phase equilibrium modeling.
Optimizing parameters and testing thermodynamic models for calculating phase equilibrium and bulk phase properties. Models include SRK, PR, CPA and PC-SAFT. 

Calsep Publications

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

Sørensen, H., Boesen, R.R., Leekumjorn S. and Herslund, P.J. Peng-Robinson Equation of State Extended to Handle Aqueous Components Using CPA Concept.
Journal of Natural Gas Engineering, 3 (1), 2018, pp. 1-38

Boesen, R. R., Herslund, P. J., and Sørensen, H.
Loss of Monoethylene Glycol to CO2-and H2S-Rich Fluids: Modeled Using Soave–Redlich–Kwong with the Huron and Vidal Mixing Rule and Cubic-Plus-Association Equations of State.
Energy & Fuels 31, 2017, pp. 3417–3426

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


Ph.D. in chemical engineering from the Technical University of Denmark, Kgs.Lyngby, Denmark.
Thesis title: Investigation and Modelling of Diesel Hydrotreating Reactions

M.Sc. in chemical engineering from the Technical University of Denmark, Kgs. Lyngby, Denmark.
Thesis Title: Development of a Reactor Model for Trickle-bed Hydrosulfurisation Units


Calsep A/S, Consultant

Department of Chemical and Biochemical Engineering. Ph.D. student


Teaching PVTsim Classes

Instructor / teacher in approximately 30 open and in-house PVTsim classes.


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