Well Test Analysis for Multilayered Reservoirs with Formation Crossflow

Hedong Sun, Chengtai Gao

• Publisher: Gulf Professional Publishing
• Year: 2017
• Print ISBN:
  9780128128534
• eBook ISBN:
  9780128128541
• Topic: Technology & Engineering
• Subtopic: Chemical & Biochemical Engineering
• Index: Technology & Engineering

Well Test Analysis for Multilayered Reservoirs with Formation Crossflow introduces the fundamentals of well test analysis of a multilayered reservoir with formation crossflow. The effects of reservoir parameters on wellbore pressure and flow rate are examined, as is a proper method that has been established to analyze well test data that leads 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, exploring methods to establish them and presenting practical applications to utilize and implement for today's more complex reservoirs. Aiding in better well testing operations and models, this book is a one-stop solution for today's reservoir and production engineer, helping them 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 - Includes a new unsteady crossflow model for 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 test procedures and layer-by-layer test procedures that are useful for shales between layers

Table of contents

• Cover image
• Title page
• Table of Contents
• Copyright
• About the Author
• Acknowledgment
• Introduction
• Chapter 1: Semipermeable Wall Model of a Multilayer Reservoir with Crossflow
• Chapter 2: Single-Phase Fluid Flow in a Two-Layer Reservoir with Significant Crossflow
• Chapter 3: Pressure Transients and Crossflow Caused by Diffusivities in Multilayer Reservoirs
• Chapter 4: Crossflow Behavior and the Determination Reservoir Parameters by Drawdown Tests in Multilayer Reservoirs
• Chapter 5: Determination of Total Productivity by a Constant Wellbore Pressure Flow Test and the Crossflow Behavior in Multilayer Reservoirs
• Chapter 6: Determination of Individual Layer Properties by Layer-by-Layer Well Tests in Multilayer Reservoirs with Crossflow
• Chapter 7: Determination of Parameters for Individual Layers by Transient Well Tests in Multilayer Reservoirs
• Chapter 8: Interpretation Theory for Vertical Interference Testing Across a Low-Permeability Zone
• Chapter 9: Unsteady Crossflow Model for Leaky Vertical Interference Testing Across a Low-Permeability Zone
• Chapter 10: Material Balance Equation of Multilayer Gas Reservoir
• Chapter 11: Computer-Aided Well Test Design and Well Test Analysis of Layered Reservoirs
• Nomenclature
• Appendix A: Analytical Solution for the Stationary Value of f (Chapter 2)
• Appendix B: Approximate Solution of the Diffusivity Crossflow Problem in n-Layer Reservoirs (Chapter 3)
• Appendix C: Solution of the Crossflow Caused by Different Boundary Pressures (Chapter 4)
• Appendix D: Approximate Solution for a Well Producing From All Layers at a Constant Rate (Chapter 7)
• Appendix E: Approximate Solution and Its Extension When Each Layer of a Two-Layer Reservoir Produces Independently (Chapter 7)
• Appendix F: Case for Variable Bottom-Hole Rate (Chapter 8)
• Appendix G: Case for Constant Wellhead Rate (Chapter 8)
• Appendix H: Solution of the Problem (Chapter 9)
• Appendix I: Limiting Behavior for f=αD(pwD1-pwD2) (Chapter 9)
• Appendix J: Commonly Used Units in Different Unit Systems
• References
• Index