Wireline logging is used to refer to the practice in the oil & gas sector in which a logging tool that is joined to a wireline is lowered into an oil well or a borehole so as to measure the rock’s attributes and also the formation fluids. The measurements that are derived through these methods are interpreted and also used to decide the depths and the zones where the oil and gas can be expected to lie.

The history of wireline logging goes back as far as about 90 years ago when two brothers that are named Marcel and Conrad Schlumberger, ran what is known to be the very first wireline log at the Pechelbronn Oil Company oil field in France.

They made some series of experiments to test it, and it was a success which the brothers then decide to call their new technique “an electronic survey.”  Few years later, the term “well log” was used in the United States. It is called wireline logging because the logging tool is reduced into the borehole or oil well on the end of a wireline.
The wireline logging tools that are used are cylindrical, and they range from a narrow diameter of about one and a half inches and up to about five”. There are three kinds of wireline logging tools.

The very first type measures the spontaneous potential that is the disparity in the voltage between the in the wireline logging tool electrode while it is inside the oil well, and another electrode that is positioned on the facade. It usually comes with additional equipment that measures the natural radiation that originates from the natural isotopes. Through this means, temperature and pressure can be measured.

The last kind of tool can perform some mechanical maneuver, and this type of device can recover rock samples in varying depths so as to allow the scientists to examine the formation physically. This kind of method also can extract oil samples at varying depth and bring it to the surface for checking whether they are used for the casing of the oil well, and are therefore open hole logs, or whether they were used after it had to be cased, and therefore cased hole logs.

The advantages that come with the use of wireline logging is considerable which allows the acquisition of treasured data at a very fast rate and also over quite a wide range of depths.