The monograph introduces the reader to the world of inductive well
logging - an established method for surveying the electrical
conductivity of rocks surrounding a borehole. The emphasis is on
developing a theory of inductive logging and on understanding
logging tools basic physics, since this theory and understanding
furnish valuable insights for inventing practical induction logging
techniques.
The first chapter of the book presents the basic laws of
electromagnetism from a point of view that will facilitate the
application of the theory to problems in electromagnetic logging.
Many topics that play an important role in the design and
interpretation of tools readings are covered. The vertical
resolution and radial depth of investigation of different induction
tools is systematically considered. Special attention is paid to
principles of induction logging with transversal induction coils,
to transient method of induction logging in media with cylindrical
and horizontal interfaces and to the influence of anisotropy on the
electromagnetic field measured in a conducting medium. Multi-coil
differential induction probes and induction logging based on
measuring the inphase component of the secondary field or the
quadrature component difference are also described in detail. The
last chapter is devoted to mathematical modeling of the response of
induction logging tools in 3D geometries. The theory of inductive
logging presented in this volume can be applied to logging after
drilling as well as logging while drilling.
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