Induction logging

Book · Sun Jan 01 04:00:00 EST 1989

OSTI ID:7014749

Kaufman, A A; Keller, G V ^[1]

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1. Colorado School of Mines, Golden, CO (USA). Dept. of Geophysics

Induction well logging is a method for measuring the electrical conductivity of the rock around a borehole, with this information in turn being used to estimate the content of oil or gas in the rock. Since the development of induction well logging in the late 1940s, it has become the standard method used, primarily because of its simplicity of design. Now, 40 years later, and with the availability of new technology both in tool construction and in mathematical analysis, this book examines understanding of induction logging in mathematical detail, and suggests how to develop more useful applications. It reviews the theoretical basis of the electromagnetic methods for determining earth conductivity. All such methods are based fundamentally on Maxwell's equations. The book deals with the use of two coils, their axes aligned with a wellbore, as a means for generating and detecting an electromagnetic field. This is the configuration of the standard tool for induction well logging in use today. Many factors influence the measurement of rock conductivity using this method, including the existence of a mud-filed or gas-filled borehole, alteration of the rock near the borehole by infiltration of fluids from the wellbore, non-zero dimensions of the tool, imperfect centering of the tool in the wellbore, and the effect of adjacent beds with conductivity different from that of the rock opposite the tool. All of these factors are evaluated analytically.

• OSTI ID: 7014749
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
BOREHOLES
CAVITIES
DIFFERENTIAL EQUATIONS
DRILLING EQUIPMENT
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTROMAGNETIC FIELDS
ENERGY SOURCES
EQUATIONS
EQUIPMENT
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GAS SATURATION
GASES
GEOLOGIC SURVEYS
MAXWELL EQUATIONS
NATURAL GAS
OIL SATURATION
PARTIAL DIFFERENTIAL EQUATIONS
PETROLEUM
PHYSICAL PROPERTIES
RESERVOIR ROCK
SATURATION
SURVEYS
TECHNOLOGY ASSESSMENT
WELL LOGGING