Table of Contents
Pressure transient analysis is a key technique used in reservoir engineering to evaluate subsurface properties. It involves studying pressure changes over time following a disturbance, such as well testing, to understand reservoir characteristics. This method helps in estimating parameters like permeability, porosity, and reservoir boundaries.
Basics of Pressure Transient Analysis
The process begins with creating a pressure drawdown or buildup test. During these tests, pressure data is collected at the wellbore over a period of time. Analyzing this data reveals how pressure declines or recovers, indicating flow regimes and reservoir properties.
Types of Pressure Tests
- Drawdown tests
- Buildup tests
- Interference tests
- Pulse tests
Key Parameters and Interpretation
Analysis involves plotting pressure data on type curves or using analytical models. Key parameters include skin factor, transmissivity, and storativity. These parameters help determine the productivity of the reservoir and identify any damage or enhancement zones.