What Is Casing Collar Locator?
The Netssu CCL (One-Line™ Casing Collar Locator) responds to changes in metal volume such as at tubing collars and perforations.
CCL operates as part of a One-Line™ tool string and derives power and control from a suitable system controller e.g. XTU.
As the tool passes a collar or a change in metal volume, lines of metal flux between two opposing permanent magnets are disturbed.
This induces a low frequency voltage or EMF in a coil mounted between the magnets. This signal is amplified and compensated for line speed to maintain a high signal gain in all circumstances.
Finally the signal is converted by a voltage-controlled oscillator for recording in the One-Line™ section of the tool.