Introductory Well Testing

Bookboon, 2013. — 103 p. While there are many excellent and important books on the subject of well testing, few provide an introduction to the topic at the very basic level. The objective is to provide an easy to read introduction to classical well test theory. No previous knowledge in well testing is required. The reader is expected to understand basic concepts of flow in porous media. Well test interpretation depends on mathematical models. Some calculus skill is required. Hopefully, this book will give the reader a useful introduction to a fascinating subject and stimulate further studies. Well testing is important in many disciplines: petroleum engineering, groundwater hydrology, geology and waste water disposal. The theory is the same, but different nomenclature and units are used. The present book use consistent units and petroleum engineering nomenclature. A consistent unit system leads to dimensionless constants in all equations. Equations in a consistent unit system are dimensional transparent but inconvenient numerically. Hence a myriad of practical unit systems have evolved. Many authors present equations first in consistent units and then convert them to the practical unit system of their choice. Conversion factors are easily available in the literature. Sisältö Preface Introduction Productivity of Wells Introductory remarks Flow equations for boundary dominated flow Productivity index, PI Time dependency of the pseudo-steady solution Flow efficiency Skin Factor Introductory remarks Steady state flow Skin factor Pseudo-steady flow Hawkins’ Formula for Skin Introductory remarks Hawkins’ model Equivalent Wellbore Radius Introductory remarks The equivalent wellbore radius Drawdown Test Introductory remarks Drawdown test Determination of permeability Determination of skin factor Reservoir Limit Test Introductory remarks Reservoir limit test Determination of pore volume, circular drainage area Interference Test – Type Curve Matching Introductory remarks Interference test The line source solution Type curve matching Pressure Buildup Test Introductory remarks Pressure buildup test Infinite-acting reservoir Determination of permeability Determination of the initial reservoir pressure Determination of the skin factor Bounded reservoir Determination of the average pressure Average reservoir pressure Horner time Pressure Derivative Introductory remarks Drawdown Buildup Derivation algorithm Wellbore Storage Introductory remarks Drawdown Buildup Principle of Superposition Introductory remarks Several wells in an infinite reservoir Method of images Superposition in time Appendix A: Core Analysis Introduction Well testing Average porosity obtained by core analysis Average permeability obtained by core analysis Arithmetic average Harmonic average Probability distribution function Geometric average Powerlaw average Commingled reservoir Appendix B: A Note on Unit Systems Introductory remarks Consistent SI Units American Field Units Conclusion Innhold Preface Introduction Productivity of Wells Introductory remarks Flow equations for boundary dominated flow Productivity index, PI Time dependency of the pseudo-steady solution Flow efficiency Skin Factor Introductory remarks Steady state flow Skin factor Pseudo-steady flow Hawkins’ Formula for Skin Introductory remarks Hawkins’ model Equivalent Wellbore Radius Introductory remarks The equivalent wellbore radius Drawdown Test Introductory remarks Drawdown test Determination of permeability Determination of skin factor Reservoir Limit Test Introductory remarks Reservoir limit test Determination of pore volume, circular drainage area Interference Test – Type Curve Matching Introductory remarks Interference test The line source solution Type curve matching Pressure Buildup Test Introductory remarks Pressure buildup test Infinite-acting reservoir Determination of permeability Determination of the initial reservoir pressure Determination of the skin factor Bounded reservoir Determination of the average pressure Average reservoir pressure Horner time Pressure Derivative Introductory remarks Drawdown Buildup Derivation algorithm Wellbore Storage Introductory remarks Drawdown Buildup Principle of Superposition Introductory remarks Several wells in an infinite reservoir Method of images Superposition in time Appendix A: Core Analysis Introduction Well testing Average porosity obtained by core analysis Average permeability obtained by core analysis Arithmetic average Harmonic average Probability distribution function Geometric average Powerlaw average Commingled reservoir Appendix B: A Note on Unit Systems Introductory remarks Consistent SI Units American Field Units Conclusion While there are many excellent books on the subject of well testing, few provide an introduction at the very basic level. You can download the book for free via the link below.