Electric Wireline Logging
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Wirelines are electric cables that transmit data about the well. The wireline may
consist of single strands or multi-strands, but is used for both well intervention
and formation evaluation operations. This implies that wirelines are useful in
gathering data about the well in logging activities, and also in workover jobs that
require data transmittal.
In 1927, Conrad and Marcel Schlumberger develop wireline logs and used it to
measure formation properties in a well through electrical lines of wire. Unlike
Measurement While Drilling (MWD) and mud logs are constant downhole
measurements sent through the electrical wireline used to help drillers,
geologists, and engineers make real-time decisions about drilling operations.
Wireline logs can measure resistivity, conductivity and formation pressure, as
well as sonic properties and wellbore dimensions.
At the bottom of the wireline, the logging tool also known as sonde is located.
The measurements are taken by lowering the wireline to the prescribed depths
and then raising it out of the well. Continuously, measurements are taken on the
way up, in an effort to sustain tension on the line.