Kristian Krejbjerg
| Title | Principal Consultant, President, Calsep, Inc. |  |
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| Phone | +1 281 759 0844 | |
| Direct | +1 281 759 8822 | |
| Fax | +1 281 759 0845 | |
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| Address | Calsep, Inc., 11490 westheimer Rd, Suite 500 Houston, TX 77077, USA |
Consulting Services, examples
EOS Modeling
Characterization to same pseudo components for 5 fluids from GOM field. The fluids varied from gas condensates to black oils and all samples were contaminated with mud. The resulting EOS model matched experimental data for all fluids and was lumped to 6 components.
Characterization study for 12 different fluids, varying from lean condensates to oils with API<25. All fluids were characterized to same pseudo components and matched experimental PVT data for the individual fluids.
Depth gradient study. Based on pressure gradient data and bottom hole samples from 4 different zones, it was evaluated whether an EOS model for depth gradients would support communication between the zones.
Wax deposition study
Based on bottom hole samples from 9 different wells, the amount of wax deposition was evaluated in a pipeline that would transport the co-mingled fluid from the wells.
Customized software development
A program for allocation of production streams in a field containing hundreds of wells, some with miscible floods, was developed. The functionality included automatic reading of input files with sampling information, batch recombination calculations and batch process simulations and automatic generation of output files for overall allocation procedures.
Development of algorithms to be used in connection with multi phase meters. The algorithms were based on PVTsim technology and made a conversion of measured mass flow rates at meter conditions (elevated pressure and temperature) to standard volumetric flow rates.
Development of Microsoft Excel spreadsheet with VB code that makes use of PVTsim Open Structure Flash calculations to carry out batch calculations for phase distributions along pipeline profiles.
Teaching of courses in EOS Modeling and flow assurance
2 "open" courses / year in Houston since 2001 in Calsep's offices.
Examples of in-house courses:
Shell: New Orleans, Houston
ConocoPhillips: Anchorage, Houston
Apache: Houston
Intec Engineering: Houston
Petrobrás (E&P and Cenpes): Rio de Janeiro
SPT Group: Oslo and Houston
ADMA: Abu Dhabi
Publications
Lindeloff, N. and Krejbjerg, K.: "A compositional model simulating wax deposition in pipeline systems" Energy and Fuels, 16, 2002, pp. 892-903.
Lindeloff, N. and Krejbjerg, K.: "Compositional Simulation of Wax Deposition in Pipelines: Examples of Application" Presented at Multiphase '01, June 13-15, 2001, Cannes, France.
Krejbjerg, K., Lindeloff, N., Berentsen, H. and Midtveitt, V.R.: "Conversion of Multiphase Meter Flowrates" Paper presented at the 19th Intl. North Sea Flow Measurement Workshop, Oct. 22-25, 2001, Kristianssand, Norway.
Rasmussen, C. P., Krejbjerg, K., Michelsen, M. L. and Bjurstrøm, K., "Increasing Computational Speed of Flash Calculations with Applications for Compositional Transient Simulations". SPE 84181, SPE ATCE Denver, Co, October 5-8, 2003.
Krejbjerg, K., Sorensen, H.: "A solution algorithm for simulating hydrate growth". Paper presented at the Fifth International Conference on Gas Hydrates, June 13-16, 2005, Trondheim, Norway.
Krejbjerg, K., Pedersen, K. S., "Controlling VLLE Equilibrium with a Cubic EoS in Heavy Oil Modeling". Paper presented at the Petroleum Society's 7th Canadian International Petroleum Conference, June 13-15, 2006, Calgary, Canada.
Education
| 2004-2007 | MBA. Houston Baptist University. Houston, USA. |
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| 1994-1999 | M. Sc. in Chemical Engineering. Technical University of Denmark, Kgs. Lyngby, Denmark. |
Employments
| 2001- | Calsep, Inc., Houston, USA. |
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| 1999-2001 | Calsep A/S, Kgs. Lyngby, Denmark. |