A comprehensive review of analytical solutions and advances in pressure transient analysis of conventional reservoirs
Mohammad Reza Arab Juneghani, Sajjad Moradi, Mohammad Reza Zavelaneh, Javad Siavashi, Mohammad Sharifi
Abstract
Pressure Transient Analysis (PTA), or well testing serves as one of the main tools for determining the hydraulic properties of underground porous media and the productivity of wells. It is widely used in several disciplines, including hydrology, petroleum, and geothermal systems. It can be used to ascertain both the static and dynamic properties of reservoirs. This research offers a concise historical overview of PTA methods, tracing their evolution since the 1950s. Determining reservoir properties from pressure data is contingent upon various factors, encompassing diverse wellbore storage (WBS), well, reservoir, and boundary models. The study meticulously reviews a spectrum of analytical solutions proposed by researchers, providing a comprehensive understanding of the analytical aspect. The research then elucidates the time-dependent pressure responses across different boundary, reservoir, and WBS models by presenting type curves. While the study emphasizes analytical methods, it acknowledges the role of numerical models, particularly for complex flow mechanisms, and suggests that these numerical approaches, though more computationally intensive, complement the analytical methods by providing a deeper understanding of intricate reservoir behaviors. The visual representation of type curves enhances the clarity of pressure responses under various conditions within reservoir systems. The paper concludes with a comprehensive examination of the evolving PTA field, highlighting the latest advancements in well testing methods and their implications for future research.