Consulting Service:

Examples of Recent Projects

Field Wide EoS Models

Asia Pacific 2020: PVT modeling for lean condensates. Common EoS models matching routine PVT data for each field.

Trinidad and Tobago 2020: PVT modeling for heavy oils. Common EoS model matching available PVT data.

GoM 2020: Common EoS model for several fluid samples. An asphaltene model was created for one fluid that had asphaltene onset pressure data. The model was applied to predict the asphaltene phase behavior of other fluids from the same field.

Mediterranean Sea 2019: Common EoS modelfor lean condensates matching available PVT data

Middle East 2019: Common EoS model for 21 H2S rich reservoir fluids, 3 near-critical gas condensates and 18 black oils. All 21 fluids had routine PVT data and 11 had solubility swelling data.

Africa 2020: PVT modeling for the West Africa fluids. The modeling involved cleaning for OBM contamination and creating a common EoS model for both gas condensate and oil samples with gas injection data.

USA 2018: PVT modeling for unconventional reservoir fluids. The modeling involved creating a common EoS model for gas condensate and oil samples.

USA 2018: PVT modeling work for EOG Resources for Eagle Ford fluids.

Middle East 2018: Review of 9 existing EoS models. Comparison of simulation results with measured PVT data at reservoir and separator conditions.

North Sea 2016: Equation of state and depth gradient modeling. Common EoS model for several fluid samples. Compositions adjusted to match observed well test GORs.

North Sea 2016: Fluid communication and EoS modeling study for North Sea gas condensate fields.

Middle East 2015: Common EoS models for fluids in offshore field. Identification of representative samples from a total of 100+ samples, and creating 3 common EoS models, which complied with the production data when used in reservoir simulators.

Middle East 2015: QC of sampling data and estimation of CGR for gas condensate reservoir fluids. QC of PVT data. EoS model development.

South America 2015: Five samples of CO2 rich reservoir fluids were numerically cleaned for OBM and a common EoS model developed.

Iraqi fluids 2015: Common EoS model. The modeling involved identification of representative samples based on flow data from the time of sampling, common EoS modeling, and a compositional depth gradient analysis.

Texas 2015: Common EoS model matching routine PVT data for West Texas reservoir fluids ranging from gas condensates to black oils.

Africa 2014: Investigation of fluid communication across wells. Development of common EoS models.

Middle East 2014: EoS model matching routine PVT data and EOR data with both HC rich and HC lean injection gases.

North Sea 2013. Common EoS model matching routine PVT data and EOR data with HC and CO2 injection gases.

Africa 2012. Common EoS models for several fields in West Africa. The work involved cleaning for OBM contamination, generation of PVT data for the cleaned fluids, creation of a common EoS model for gas condensate and oil samples with gas injection data. Prediction of gas-oil-contact using depth gradient simulations.

ConocoPhillips Eagle Ford 2012-2013: Development of a single EoS model for multiple fluids with a wide range of yields.

Middle East 2012: EoS model development and quantification of H2S and CO2 phase distribution in well.

Asphaltenes & Wax

GoM 2020: Common EoS model developed for OBM contaminated fluids. Asphaltene model was created and used to explain the interference in viscosity data due to solids precipitation.

Middle East 2019: Investigation of possible existence of asphaltene tar mat.

Indonesia 2016: EoS and wax deposition models for fluids from offshore field. The wax deposition predictions were used to identify the location of wax deposition in the subsea pipeline.

North Sea 2015: Study to reveal optimum production scenarios to avoid wax deposition in wells.

Middle East 2014: EOR EoS model matching routine PVT data, EOR PVT data, and asphaltene data.

Asia Pacific 2014: Resident fluid engineer at a client office. Helped build EoS models for engineering applications including wax and hydrates. Trained engineers in EoS modeling and prepared written technical guidelines.

GoM 2012: PC-SAFT and Cubic EoS models for the asphaltene prediction of GoM oil with N2 gas injection.

USA 2011-2012: Generated EoS model to match the asphaltene titration data. Utilized EoS model to investigate the effect of oil blending and determine the tendency for asphaltene precipitation.

Multiphase Meters & Customized Software Solutions

Mediterranean Sea 2021: Automated import and export tool for up to 500 fluid compositions, between PVTsim Nova database and external software.

North Sea 2021: Multiphase Metering software handling mixing of well streams and gas lift, calibration of flow meters, flow meter and test separator calculations considering water and salts. 

Middle East 2020: Integrated compositional subsurface and surface modeling tool for monitoring daily production of produced fluid from multiple reservoirs. Mixing and flashing of fluids at well level, at platform level, and in the separation plant.

Middle East 2013: Reservoir grid initialization software

Asia 2013: Developed a ready to use Excel tool to calculate the produced well stream composition for wells under gas-lift operation.

North Sea 2012: Allocation software for use on Gullfaks and other North Sea fields.

North Africa 2011: Calculations of produced compositions from an old ECL 100 simulation. Custom software developed to simulate the compositions.

Canada 2004 & 2008: Development of a customized software for a mature Canadian field used for allocation calculations.


Lay Tiong Lim

Senior Consultant & Technical Sales
Calsep Asia Pacific SDN BHD

Peter Jørgensen Herslund

Senior Consultant
Calsep Copenhagen

Rasmus Risum Boesen

Senior Consultant
Calsep Copenhagen

Sukit Leekumjorn

Senior Consultant
Calsep Inc. Houston

Meet the rest of our team

At Calsep we reach all continents, either via online meetings or via our representatives in United States, Europe, Asia and the Middle East.