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Geothermal Applications

Geologic Model/Mesh Creation

PetraSim includes tools to represent geological formations and faults in a conceptual model independent of the model mesh. The conceptual model can be created based on xyz surfaces exported from other modeling programs such as RockWorks or Surfer, or based on a GRDECL file exported from Petrel or other modeling packages.

Create natural state model using fixed temperature or pressure boundary conditions, flow rate or flux-based sinks and sources and a variety of initial condition options.

Once a natural state model is produced, create historical and predictive models by incorporating deviated production and injection wells that can be easily enabled and disabled.

PetraSim for Geothermal Applications
Image taken from Sirait, P; Ridwan, R.L. and Battistelli, A. (2015), Reservoir Modeling for Development Capacity of Dieng Geothermal Field, Indonesia, PROCEEDINGS, Fourtieth Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California.

TOUGH2 Enhancements

PetraSim 2017 has added several new features that give improved support for geothermal simulations.  These include updates to the TOUGH2 simulator to support updated steam tables, improved well boundary conditions, and more.

  • Specify the start-up time for a well on deliverability. This avoids the need for multiple restarts when modeling a number of make-up wells in field-scale geothermal production forecast.
  • Specify the productivity index (PI) and flowing pressures for each layer of a well on deliverability.
  • IAPWS-IF97 correlations for pure water added to the standard TOUGH2 EOSs. These extend the use of TOUGH2 to near-critical conditions (T>350°C) and to geothermal geopressured conditions (P>1000 bara).
  • IAPWS 2008 viscosity formulation for pure water and steam added to the standard TOUGH2 EOSs.

For a detailed list of changes, please see the PetraSim Release Notes.

PetraSim for Geothermal Applications
Image from Montegrossi, G.; Pasqua, C; Battistelli, A.; Mwawongo, G.; Ofwona, C. (2015), 3D Natural State Model of the Menengai Geothermal System, Kenya, Proceedings World Geothermal Congress 2015 Melbourne, Australia

References

Rop, Eric; Fujii, Hikari and Jalilinasrabady, Saeid (2018). An updated numerical model of the Greater Olkaria geothermal system, Kenya, Akita University Japan, PROCEEDINGS, 43rd Workshop on Geothermal Reservoir Engineering Stanford University, SGP-TR-213.

Sbrana , Alessandro; Pasquini, Giuseppe ; Marianelli, Paola ; Bonciani, Dario and Torsello, Loredana (2016). Geo4P – Geothermal Pilot Project Pisan Plain; Quantitive assessment of very low, low and medium temperature shallow geothermal resources, European Geothermal Congress 2016 Strasbourg, France.

Battistelli, Alfredo; Swenson, Daniel and Alcott, Alison (2017). Improved PetraSim-TOUGH2 Capabilities for the Simulation of Geothermal Reservoirs, PROCEEDINGS, 42nd Workshop on Geothermal Reservoir Engineering Stanford University, Stanford, California, 2017 SGP-TR-212.

Wisnu Ardhi Nugroho, Faizal Waliy, Skolastika Marganing Pradipta Putri (2018). Natural State Model of the Candi Umbul Telomoyo Geothermal System, Central Java, Indonesia, The 6th Indonesia International Geothermal Convention & Exhibition (IIGCE).

Akhmad, Aburiza; Putra, Budiman; Sihombing, Mutiara; Tantri Ayu, Salsabila; Yolanda, Theresia (2021). A Numerical Study for Determining Lateral Thermal Gradient Based on Reservoir Properties, PROCEEDINGS, 46th Workshop on Geothermal Reservoir Engineering, Stanford University, Stanford, California, SGP-TR-218.