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Institute of Subsurface Energy Systems
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Internship for Master's students

Objectives:

The 6-month internship will focus on evaluating and testing PFLOTRAN-OGS, a reservoir simulator specifically designed for CO2 storage. The main objective will be to assess the simulator’s compatibility with other industry-standard numerical simulators, as well as to test and identify key differences. The study will include converting simulation models of depleted gas and oil reservoirs from the ECLIPSE/tNavigator format to PFLOTRAN, comparing the results, and evaluating simulator performance (speed, convergence, etc.). Additionally, the evaluation should cover multiple options for brine density calculations, cross-interpolation between CO2-water and HC-gas-water permeability tables, implementation of the GERG2008 EOS, and schedule conversion from Eclipse/tNavigator to PFLOTRAN format.

Tasks and deliverables:

  • Convert the tNavigator gas reservoir compositional and black oil model to PFLOTRAN format
  • Convert the tNavigator oil-reservoir compositional model to PFLOTRAN format
  • Perform history matching using PFLOTRAN-OGS for depleted hydrocarbon fields prior to conducting CO2 injection simulations.
  • Compare base case simulation results for multiple CO2-H2O solubility options across different simulators.
  • Test the stability of the numerical solution (with higher and lower injection rates, continuous and cyclic injections) and perform runtime sensitivity analysis.
  • Test the thermal options in gas-water mode.
  • Create a conceptual 2D model to test brine density (effect of salinity) calculation options, cross-interpolation between CO2-water and HC-gas-water relative permeability tables (including hysteresis), and implementation of the GERG2008 EOS.

Requirements:

The candidate should have a good understanding of numerical reservoir simulation and the various Equations of State used in the industry. Knowledge of ECLIPSE and/or tNavigator is required.

References:

  1. opengosim.com

Location:

Kassel

Start/Duration:

April 1, 2023, duration 6 months

Contact:

Institute of Subsurface Energy Systems
Department of Reservoir Engineering

Dr.-Ing. Bettina Jenei
bettina.@.jeneitu-clausthalde