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Casing Inspection Tool

Wednesday 17 May 2017 at 11:30 am.

A casing inspection examines the integrity of the tubing or casingto find cracks and holes, as well as corroded areas and possible liquid entry or exit points. It also spots scale or bacteria buildup that can block the flow of hydrocarbons out of the wellbore.

The physical examination of the well completion string is an essential part of production logging. Inspection for damage or corrosion should be done because it may result in further problems. In the following paragraphs, some of the most commonly utilized casing inspection methods will be discussed.

The first most commonly used for casing inspection are the electromagnetic tools. There are two types of electromagnetic tools: those that detect physical defects in its wall and those that measure the depth of metal in a casing string. Both types are consisting of a receiver coil and transmitter coil that sends an alternating current through the transmitter coil. Appropriate coil spacing establishes that the alternating magnetic field’s flux lines sensedby the receiver coil have gone through the casing.

Another type of casing inspection tool is the caliper log. Caliper logs are varying arrangements of system which can measure the inner shape of a casing string. Casing caliper is useful when leaving wells as it let casing grading to be salvaged, and it is especially helpful to where drilling maneuvers have been done for a long time.

The third type of casing inspection tools are the electrical potential logs which can measure the magnitude and direction of the galvanic current that enters and leaves the casing. By that, the location of corrosion and also the amount of lost iron will be indicated. Electrical potentials are gauged at preset intervals for the mathematical source of such data. A disgrace to this tool is that the measurements invalidated and the data will be warped when aqueous solutions like mud fill the casing holes.

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