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Overview of a Wireline Log


A Wireline Log is a procedure that uses an instrument to record density, composition and structure of the ground beneath. Oil and gas companies use this device to discover and collect hydrocarbons. They are less commonly used to explore potential coal, mineral, and water well sites. Even though this device does not detect oil or gas underground, it will predict it through the condition of the soil. The most common sensors use sonic waves, thermal, and gamma rays to find hydrocarbons.

To start a log, a truck with a long wire goes down a long bored hole already made. A device records sensitive physical, chemical, and electrical information as it moves up. This data becomes digital and analog charts so that a geologist can analyze patterns in the earth’s crust. The computerized surface equipment for recording data can cost over one million dollars. A Geologist will analyze several logs over different bore locations. They will build an underground landscape and determine if some parts indicate a sign of hydrocarbons. One positive sign of possible hydrocarbons is how porous the rock is. The more pores in rocks the more likely hydrocarbons will be present. Another good sign is of any large fractures in the underground rock. Fractures contain large spaces which tend to fill with oil and gas, producing large reservoirs. If a drill does operate, the log data will be used to prevent spills.

Drills will also use wireline logs during and after an operation. They can use data to understand the production of a drill with thermal sensors. If the data shows different than predictions, geologists can correct their data. This information is vitally important for prevention of spills and formation of sink holes. Wireline logs are essential in the entire process of discovering and drilling oil and gas.

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