Reservoir Material Balance Fundamentals

This skill module reviews and expands on the Material Balance Core module. Included in this skill module is a detailed review of Dry and Wet Gas Reservoirs, Black Oil Reservoir, Volatile Oil and Retrograde Condensate Reservoir, and Water Influx.

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Target Audience

Engineers or geoscientists who will occupy the position of reservoir engineer, and any other technically trained individual who desires a more in-depth foundation in reservoir engineering.

You Will Learn

Participants will learn how to:

• Discuss the basic material balance equation and the assumptions
• Understand how the equations can be simplified based on certain assumptions and importance of mechanisms
• Relate material balance equation to different types of reservoirs
• Understand the application of material balance equation for gas reservoirs
• Consider the simplifications of material balance equation for absence or presence of different mechanisms
• Evaluate the uncertainties associated with mischaracterization of different mechanisms
• Apply various straight line manipulations for determining the gas in place for gas reservoirs
• Understand important drive mechanisms for black oil reservoirs
• Estimate the oil in place in oil reservoirs when the reservoir is above bubble point
• Estimate the oil in place in oil reservoirs when the reservoir is producing below bubble point
• Estimate the oil in place in oil reservoirs when the reservoir is influenced by gas cap
• Quantify the uncertainties in oil place based on the assumptions in the strength of drive mechanisms
• Understand important drive mechanisms for retrograde condensate and volatile oil reservoirs
• Estimate the oil in place in both these types of reservoirs under different mechanisms
• Quantify the uncertainties in oil place based on the assumptions in the strength of drive mechanisms
• Understand the importance of water influx in the material balance calculations
• Learn how to estimate the water influx using pot aquifer as well as pseudo-steady state methods
• Understand trial and error procedure required to estimate the aquifer influx
• Recognize the uncertainties associated with the estimation of aquifer size and the strength

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