Underground storage of gas and energy

Course objectives: Upon completing the course, the student will be able to explain the mechanisms of gas dissolution in oil and water; assess the storage capacities of underground storage facilities for natural gas, carbon dioxide, thermal energy, hydrogen and compressed air; discuss the problem of permeability of isolating rocks and design simulation models of injecting gases and energy into the storage geosystem.

Course content:

  • Types of fluids that can be stored underground;
  • Activities related to individual methods of energy storage, conversions of energy units, efficiency / effectiveness / cost-effectiveness of each method;
  • Underground gas storage - divisions of underground gas storage (aquifers, depleted gas reservoirs, depleted oil reservoirs);
  • Gas dissolution in oil and water - problems of gas injection into the aquifer zone;
  • Ternary systems H2O-NaCl-CO2 - special types of phase diagrams of non-hydrocarbon mixtures;
  • Gas storage - calculation of the well pressure drop, pressure drop depending on the injection and the pressure profile in the near-wellbore zone;
  • Calculation of the influence of reservoir properties and present fluids (hydrocarbons, aquifer) on gas injection and prediction of reservoir and production system behavior during frequent gas withdrawal and injection;
  • Estimates of changes in the mobility of injected or withdrawn gas;
  • Estimates of energy expended on gas injection;
  • Volumetric estimates of storage capacity in old hydrocarbon reservoirs;
  • Analytical calculation of natural gas injection into an depleted gas reservoir;
  • Simulation assessment of natural gas storage in deep saline aquifer and comparison with storage in depleted hydrocarbon (gas) reservoir;
  • Determining the working volume, deliverability and injectivity of underground gas storage (UGS) site;
  • Determining the function of cyclic withdrawal or injection of media (natural gas, compressed air, hydrogen);
  • Project / seminar assignments: assessment of storage potential (1) thermal energy storage, (2) CO2 storage, (3) hydrogen and compressed gas storage, (4) natural gas storage, simulation example of gas injection into a reservoir (comparison with analytical prediction).

Learning outcomes at the level of the course:

  • Predict the behaviour of the reservoir and the production system during the gas injection and withdrawal cycle;
  • Make a simulation natural gas injection model into the reservoir, and CO2 storage model into depleted reservoirs and into aquifers;
  • Determine the possibilities of wind energy storage in underground energy storage facilities;
  • Determine the possibilities of storing hydrogen underground;
  • Determine the optimal size and concept of the cushion gas;
  • Optimize the underground storage system by the ratio of injection and withdrawal speed and water cut;
  • Determine safety of the assessments based on technical, economic and geological parameters.


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