Well Inspection Demo
2G Robotics demonstrated the methodology for building a complete model of a dug well using the ULS-200 underwater laser scanner.
If a water well is experiencing a water quality or quantity problem, the well may need to be upgraded or a new well may need to be constructed. Wells should be inspected at least once a year to ensure their structural integrity has not been compromised. Locating and measuring damage, cracking, or well casing dislocation can be difficult, however, due to limited visibility and access. 2G Robotics performed an inspection demonstration of a dug well using the ULS-200 underwater laser scanner.
The dug well was cased with concrete rings and extended 2.5m underground with an inner diameter of 1m. The ULS-200 was used to inspect the casing joint unions between the different segments of the well in order to verify alignment and locate any cracks or damage to the concrete well casing. Well casings are watertight to prevent the walls of the well from collapsing and to prevent surface water from directly entering the water supply. If there are cracks or damage to the well casing, the stability of the well structure and potability of the water are both at risk.
For the demonstration, the ULS-200 was mounted to a centralizer. The scanner was slowly lowered down the well using the centralizer, which made stops at set intervals. At each stop, the ULS-200 performed a 360-degree scan to capture a detailed 3D point cloud of the well. The scans of the top part of the well were conducted in air and the scans of the lower part were conducted in water. The 3D point clouds of the well were registered in post-processing to form the complete 3D model.
The model generated by the ULS-200 provides a level of detail that would otherwise be difficult to obtain, which allows for comprehensive analysis of the well’s condition. From the model, precise ovality measurements can be extracted, and the presence of any holes or casing joint wear can be accurately assessed in order to proactively mitigate external water infiltration. The model also provides a baseline for future inspections from which to gauge the rate and magnitude of deterioration.