Well Test Analysis for Multilayered Reservoirs With Formation Crossflow

Well test data is often interpreted based on an assumption that the reservoir is a homogeneous single layer, but in reality, the reservoir consists of many layers with different levels of permeability and pressure behavior, properly defining itself as a crossflow system.

Well Test Analysis for Multilayered Reservoirs with Formation Crossflow introduces the fundamentals of well test analysis of a multilayered reservoir with formation crossflow. Effects of reservoir parameters on wellbore pressure and flow rate are examined as well as a proper method established to analyze well test data, leading to better determinations on the reservoir parameters for each layer of the reservoir. Focusing on multilayer models for data analysis, this reference explains the reasons for the existence of single-phase crossflow in multilayer reservoirs, methods to establish and practical applications to utilize and implement for today’s more complex reservoirs. Aiding in better well testing operations and models, Well Test Analysis for Multilayered Reservoirs with Formation Crossflow is a one-stop solution for today’s reservoir and production engineer to understand every layer of their reservoir.

• Includes real-world examples of well testing through multilayered reservoirs, whether with crossflow or with formation crossflow
• Provides strong guidance and criteria of research on reservoir dynamic performance, such as physical models and mathematical models, including a new unsteady crossflow model for the vertical interference testing in low-permeability zones
• Describes interpretation methods for different cases in multilayer reservoirs, including a new model called semipermeable walls for stratified reservoirs, drawdown tests procedures, and layer-by-layer test procedures which is useful for shales between layers