The integrity of the cement bonding between the well casing and the formation is essential for supporting the casing, preventing fluid from leaking to surface, and isolating producing zones from water-bearing zones. GR Energy Services offers cement evaluation services to identify microannuli and channeling, voids and other bonding irregularities in casing sizes ranging from 2.38 in. to 18 in. The radial incremented bond (RIB) tools can determine up to 22.5-degree azimuthal resolution on cement maps, provide excellent sonic isolation, sense temperatures to ensure real-time tool quality control, and are optimized to provide the most accurate VDL measurement in various hole sizes.
GR Logging Services
The radial incremental bond tool is available in 6, 8, 12 and 16 sectors. The 16-sector tool is shown here.
This CBL-VDL log shows good and poor cement bond. A good cement bond is observed where the CBL amplitude is low and verified by the strong VDL curves. High CBL amplitude coinciding with a flat VDL indicates a poor bond.
The cement map image shows channeling (red) confirmed by poor VDL signals and high CBL. The good cement bond shown in blue corresponds to good CBL (low amplitude) and strong formation returns on the VDL curve.