Hunting’s Logging CCL Hunting’s Logging CCL is used to correlate the depth between the casing collars and the open hole log of the well. Typically run alongside gamma ray, CBL, or other cased-hole logging tools, the Logging CCL allows for accurate depth correlation between the casing collars and the open hole log. Since open hole logs are essential for determining completion depths, the CCL log plays a crucial role in depth control for perforating and helps ensure the correct depth correlation for other wireline services performed in cased hole. Hunting’s Logging CCL utilizes Samarium Cobalt (SmCo5) rare earth magnets, providing one of the highest amplitude CCL measurements available. This technology maintains its strength even at high temperatures, which is particularly important in flush joint casing and tubing environments, as well as when logging with tools that must be centrally positioned in the wellbore. Digital CCL The Casing Collar Locator (CCL38 & CCL41) is used in cased hole applications to provide positioning measurements by detecting changes in metal volume. The CCL detector features a coil and four magnets. These magnets are installed in pairs at both the upper and lower ends, ensuring that the coil remains in a constant magnetic field. As the tool passes a collar, the magnetic flux is disturbed, generating an electrical signal. This signal is then amplified, converted into frequency, and counted by the MCU. The count is transmitted to the surface via telemetry after being encoded by the telemetry cartridge.
