Reservoir Fluid Phase Behavior & Modeling with PVTsim Nova
PVTsim Nova is a versatile PVT simulation program designed for reservoir engineers, flow assurance specialists, PVT lab engineers, process engineers, and CCS engineers.

Why Choose PVTsim Nova
PVTsim Nova is the ultimate PVT simulation tool for engineers in the energy industry, trusted by over 300 companies worldwide. Whether your work involves reservoir engineering, flow assurance, process simulation, or carbon capture and storage (CCS), PVTsim Nova covers all your needs. Designed for efficiency, PVTsim Nova minimizes the time required for fluid modeling.
With seamless integration into more than 30 reservoir, flow and process simulators, PVTsim Nova enables you to generate simulation-ready inputs effortlessly. From quality-checking fluid compositions to assessing the risk of solids precipitation, PVTsim Nova simplifies even the most demanding tasks in fluid modeling.
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Consulting Services
Calsep offers consulting services related to Equation of State simulation of reservoir fluid phase behavior. The consulting services involve all types of reservoir fluids including natural gases, gas condensates, near critical fluids, oil and heavy oils.
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Develop your PVT modeling skills
With more than 30 years of experience training industry personnel on PVT and phase behavior of reservoir fluids, Calsep offers training programs for reservoir engineers, process engineers, engineers dealing with flow assurance or multi phase flow metering, laboratory staff, and others that need to apply PVT simulation software in their work.
Train and improve your abilities with Calsep
Calsep offers open courses as well as in-house courses to reservoir engineers, process engineers, engineers dealing with flow assurance or multi-phase flow metering, laboratory staff and others needing to apply PVT simulation software in their work.
Latest Tech Talk, Software Updates & Releases
PVTsim Nova 7.0 to 8.0
NEW WORKFLOW MODULE COMBINE PVTSIM OPERATIONS IN WORKFLOWS Easy flowsheet functionality for combining operations. All input is saved directly in the workflow. Multi-fluid selection allows repeating the workflow for multiple fluids automatically. Summary output gives an immediate overview of calculations. Detailed output available for all calculations. Initial release provides support for Flash, Saturate with Water, Valve, Recombine and interface files for ECLIPSE and OLGA. NEW AUTOMATED COMMON EOS MODELING MULTIFLUID AUTO QC Automatic QC and correction of fluid compositions to be included in the Common EoS model. Automatic alignment of simulated Saturation pressures in preparation for Common EoS modeling….
PVTsim Nova User Group Meeting in Houston, October 8
PVTsim UGM is here, and once again, we’re excited to present another major version upgrade — PVTsim Nova 7! Join us in Houston for this…
PVTsim Nova 7.2 Released
We are pleased to announce that PVTsim Nova 7.2 has been released. Find the list of updates here: PVTsim Nova 7.1 to 7.2 | Calsep
Calsep Cloud
Real Time Simulations
Separators, multiphase flow meters, transient flow systems
Calsep has developed a Flash API that allows the user to perform fast and robust flash calculations with PVTsim Nova technology. Calsep’s Flash API can be accessed through Calsep’s Public Cloud solution or it can be installed in your on-premise cloud solution.
















