Perforation Depth Control Log (PDC log)

Definition - What does Perforation Depth Control Log (PDC log) mean?

Perforation Depth Control Log is a special kind of nuclear log that is used to measure the exact depth of every casing collar in a well. It is important as it helps in determining the depth of the formation to be perforated by parallel collars. A collar locator is a dogging tool which helps in examining the depth of the well. To improve the performance of the Perforation Depth Control Log, magnetic and radioactive markers are used for casing. The markers produce diverse spikes from sensors.

Petropedia explains Perforation Depth Control Log (PDC log)

In order to have a detail about the depth correlation, a wireline log known as Perforation Depth Control Log is run. The data is acquired by comparing the position of the reference log to the casing collars. At a specific point in the well, Perforation Depth Control Log is calculated with the help of a depthometer. It is essential as it ensures that wireline operations that only depend on a collar locator for depth control, such as perforating are initiated at the right depth. However, Perforation Depth Control Log is based on gamma ray sensors thus there is a need to adjust the recorded casing collar depths that reflect the vertical distance between the sensors.

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