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Enhanced Oil Recovery Case Study

Enhanced Oil Recovery Case Study. MUN Reservoir Solutions. Agenda. Fluid Recombination and Separation Separator Optimization Gas Lift Modeling Reservoir Modeling Project Progress/Moving Forward. Workflow. Fluid Characterization/ Separation - PVTsim.

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Enhanced Oil Recovery Case Study

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  1. Enhanced Oil Recovery Case Study MUN Reservoir Solutions

  2. Agenda • Fluid Recombination and Separation • Separator Optimization • Gas Lift Modeling • Reservoir Modeling • Project Progress/Moving Forward

  3. Workflow Fluid Characterization/ Separation - PVTsim Optimization of Separator Settings – Design Expert Reservoir Simulation - Eclipse Well Constraints – Prosper

  4. Fluid Recombination • Models a recombination of produced fluids to find original reservoir composition • Recombined fluid is the fluid for all MMP tests • Recombined fluid contains produced oil and gas at reservoir conditions. • Flash function models the splitting of the fluids to give the stock tank oil and gas composition

  5. Initial MMP Test • Use this produced gas composition to run MMP test with reservoir fluids MMP Results: • First Contact Miscibility – 980.35 bar • Multi-Contact Miscibility – 563.06 bar • Produced gas is not suitable for injection based on a reservoir pressure of 298 bar

  6. Separator Test • Simulates the separation of reservoir fluid components at specified temperatures and pressures

  7. Separator and MMP Test - Results • We require miscibility pressures close to reservoir pressure – 298 bar • Low pressure and low temperature tests show promising results • Further modeling is required for an optimization of results

  8. Separator Optimization • Use recorded MMP Values for selected separator temperatures and pressures • Generate a relationship between pressure, temperature and MMP – Design Expert

  9. Separator Optimization • Narrow the range of the pressure/temperature used in first stage of separator. • Re-model optimized MMP relationship • Use composition obtained from separator inputs shown below:

  10. Gas Injection Equipment • Author is Burney Waring. Image created with POVray in 1996. (http://en.wikipedia.org/wiki/File:Gaslift.jpg)

  11. PROSPER - IPR • Inflow performance relation - reservoir pressure (psig) to the oil flowrate (MMscf/day) • Assumptions and Industry Standard Values used

  12. Prosper - VLP • Vertical Lift Performance • 3 Variable • Gas Oil Ratio • Top Node Pressure • Water Cut • Results and Confirmations

  13. Prosper – Next Steps • Model the Eclipse well • Optimization with more defined variables • Model against other variables • Gas Lift Valve Placement • Tubing Roughness

  14. Reservoir SimulationCreating a Reference Case Simulation Reservoir Properties Fluid Properties Using the Norne Fluid from PVTsim Fluid Composition Critical Pressure, Temperature and Volume Using both Standard Values and Inputs from the Norne Field Porosity X-Y-Z Permeability Reservoir Temperature Reservoir Pressure

  15. Completed “Block” Simulation Model

  16. Initial “Basecase” Results

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