Wirelines are electrical cables that are used to lower tools and data into a hole or well. Wireline logging, most commonly used by the oil and gas industries, is used by the operators to see about the conditions of a wellbore. A wellbore is the hole that forms the actual well and aids in the exploration and discovery of natural resources that can be found beneath the earth’s surface. The cables are usually braided and measure the formation properties in a well through electrical wires. Most wireline logging companies provide services like formation analysis, resistivity, porosity, and temperature.
Formation analysis is generally used to determine the ability a borehole has to produce petroleum. The analysis answers two questions: What are the lower limits for porosity, and do any of the formations in the well exceed these lower limits. The analysis can be done during the drilling and provides real-time measurements of the rock formations and also checks the stability of the wellbore.
One of the main objectives during logging is to locate the hydrocarbons in a well. Geoscientists and engineers use these logging tools and technology to evaluate a well’s performance. They also use this information to develop hydrocarbon production plans.
In 1912 two brothers, Conrad and Marcel Schlumberger, came up with the idea to use electrical measurements to map out subsurface rocks. The sensors measure the different properties of the rocks and this data is then transmitted and logged. Conrad was a mining engineer and came up with electrical conductivity, which led to electrical-surface measuring systems that are used to aid in mineral exploration. Schlumberger Ltd. was founded by the brothers in 1926 and their discoveries led to many new advancements in logging. Their company remains an important oil-service company to this day.
The geological advantages of wireline logging, along with providing continuous data, supplements geologists’ geophysical surveys. It is a key element to environmental protection and aids in the location of new wells.
As technology advances, new ideas and machines are being introduced to aid in the productivity and efficiency of mining and logging. Wireline logging is an important branch of geophysics. Geophysics is the study of the earth and they use gravity, magnetic, and electrical methods to study what lies beneath the earth’s surface. Wireline drilling aids companies in making future production decisions, based on their findings, to ensure a safe environment as well as maintaining equipment.