Cement Bond Log
Assessing Cement and Grout Bond Integrity
The Cement Bond Log tool is a sonic instrument designed to evaluate the condition of the cement or grout bond around steel lining in boreholes. This tool provides critical insights into bonding quality, helping to assess structural integrity and ensure proper installation.
- Unbonded Lining: When the steel lining is unbonded, the sonic signals arrive early with high (100%) amplitude, indicating minimal energy loss.
- Bonded Lining: When the steel lining is properly bonded, the sonic signals are highly attenuated as energy dissipates through the grout into the surrounding formation. Low-amplitude first arrivals and faint or non-existent early lines on the Variable Density Log (VDL) indicate strong bonding.
Key Features
Specifications
- Dimensions: 1.9m (length) x 60mm (diameter)
- Weight: 22kg
- Sampling Rate: Variable (500 samples at 4ms or slower)
- Resolution: 16-bit; minimum record length of 2ms
- Gain Settings: 16 levels
- Maximum Temperature: 80°C
Logging Conditions
- Logging Speed: 2–5 m/min
- Centralised operation required
Borehole Compatibility
- Diameter: Suitable for boreholes 80–600mm in diameter
- Environment: Fluid-filled boreholes
- Lining: Designed for steel-lined boreholes; can also provide qualitative data for plastic-lined sections*
*Under optimal conditions, the tool can confirm the presence of plastic lining.
The Cement Bond Log tool is a reliable and accurate solution for evaluating cement and grout bonding in boreholes. Its advanced sonic technology and precise data collection make it an essential tool for ensuring structural integrity and installation quality in geotechnical, environmental, and engineering applications.
