The Casing Inspection Tool utilizes Magnetic Flux Leakage technology to determine changes in the pipe wall thickness. This is the same technology that is used in monitoring most pipelines. The technology can measure metal loss both internally and externally.
GyroTracer Directional accurately survey all well profiles from vertical to horizontal at high latitudes or inclinations with no accuracy degradation (Inclination accuracy +/- 0.1˚- Azimuth accuracy 0.1% (subject to well profile)).
Depending on casing size, the MFL sensor section has 8 to 16 pads. Each pad has 8 magnetic field sensors for measuring the magnetic flux leakage independent of logging speed, and two shallow discriminator measurements to determine if the measured flux leakage is internal or external. Together with a high speed memory section, the CIT provides the highest resolution 3D image of the integrity of the casing.
The Multi‐Finger Caliper (MFC) has 24 to 60 high resolution calipers which measures the internal radii of the wellbore tubing and casing. Accurate measurements can be made in tubular sizes from 1.75 inches to 9.63 inches in diameter. The MFC uses a series of “contactless” displacement sensors and a corresponding number of measurement fingers. When moving along the inner casing wall, the radial displacement will be changed into an axial displacement of the sensor, which is then processed, coded, and transferred to surface system where the image of the casing will be obtained. The MFC can be used to detect casing deformation, bending, fractures, holes, scale deposition, paraffin build‐up, and inner wall corrosion with high accuracy.
A cement bond tool is an acoustic tool used to measure the quality of the cement behind the casing. Using a CBT, the bond between the casing and cement as well as the bond between cement and formation can be determined. Using CBT data, a company can troubleshoot problems with the cement sheath if necessary.