tNavigator 12: Relative Permeability & PVT Designer

Summary

This video script explains the process of setting up a simulation model for fluid properties, focusing on key parameters like Young's Modulus, Poisson's ratio, and PVT data. It guides users through defining essential parameters for water, oil, and gas, using default values for simplicity. The script covers the setup of relative permeability, capillary pressure, and fluid properties, including solubility and formation factors. Additionally, it walks through the use of the PVT designer tool for oil and gas properties, with a focus on ease of modeling. Practical steps are highlighted for a streamlined setup, making the simulation process more accessible.

Takeaways

• 😀 The minimum essential parameters required for fluid modeling include Young's Modulus, Poisson's Ratio, and a few others that can be adjusted based on laboratory data.
• 😀 Relative permeability data for water and oil saturation is crucial for the simulation, where water permeability is represented by blue curves, oil by red, and capillary pressure by a green line.
• 😀 The PVT (Pressure-Volume-Temperature) model is essential for simulating the properties of fluids, including water, oil, and gas.
• 😀 For simplicity, default values can be used for the oil and gas PVT models, but these should ideally be replaced with actual laboratory data for more accurate simulations.
• 😀 The PVT Designer tool is used to create and modify models for oil and gas, with options for temperature, specific gravity, viscosity, and other key fluid properties.
• 😀 When defining the PVT model for oil, common correlations include standing, Vasquez, and Bex Robinson, but standing is used for simplicity in this case.
• 😀 Gas-specific properties, such as formation volume factor, viscosity, and compressibility, can be defined similarly to oil using default values or specific measurements.
• 😀 Viscosity is modeled as a function of temperature, where higher temperatures result in lower viscosities.
• 😀 Data for both oil and gas properties, including solubility, formation volume factor, and compressibility, can be plotted for visualization and used in simulations.
• 😀 After creating the PVT models for oil, gas, and water, the data is stored in the model designer and can be utilized in the simulation process.
• 😀 The tool allows for easy modification and adjustment of the PVT model parameters, making it flexible for use in various fluid simulation scenarios.

Q & A

What are the five core parameters required for fluid modeling in the script?

The five core parameters required for fluid modeling are Young's modulus, Poisson's ratio, grid data, and a few other basic parameters that are essential for the simulation.

What is the purpose of the relative permeability in the fluid modeling process?

Relative permeability is used to model how different fluids (like water and oil) interact with the porous medium in relation to water saturation. It is crucial for understanding fluid flow through the reservoir.

How does the script describe the use of default values in the simulation setup?

The script explains that default values are often used for simplicity in the simulation, but in reality, these values should be adjusted based on specific laboratory data for more accurate modeling.

What PVT model is used for oil in the simulation, and what correlations are selected?

The script uses the 'Varian 1' PVT model for oil, and for correlations, it suggests using 'Standing' or 'Vasquez-Beggs-Robinson' models, with 'Standing' being selected for simplicity.

What key properties are specified for oil in the PVT modeling process?

The key properties for oil include temperature, oil specific gravity, bubble point pressure, isothermal compressibility, gas-to-oil ratio (GOR), and other related parameters.

How is the relationship between viscosity and temperature modeled in the simulation?

The simulation models viscosity as decreasing with an increase in temperature. This relationship can be adjusted based on laboratory data, but default values are used for simplicity.

What specific gas properties are required for the simulation?

The gas properties required include specific gravity, gas formation volume factor, viscosity, compressibility, and the Z-factor. These properties are specified using default values for simplicity.

Why does the script emphasize the use of laboratory data in PVT modeling?

Laboratory data is emphasized because it provides more accurate and realistic values for the fluid properties, such as viscosity and formation volume factor, compared to default values.

What is the significance of the gas-oil ratio (GOR) in the simulation?

The gas-oil ratio (GOR) is a critical property that represents the amount of gas dissolved in oil under reservoir conditions. It helps in modeling the behavior of oil and gas mixtures in the reservoir.

How are the PVT models for oil, gas, and water handled in the simulation software?

The PVT models for oil, gas, and water are constructed using the provided data, with separate configurations for each fluid type. After setting up the parameters, the data is stored in the model designer for further use in the simulation.