In this study, our recent and new approach for detailed tracking of the interface between well fluid and cement by using particles is investigated. The particles can enable us to know the precise location of the interface between two fluids and be sure about displacement efficiency in the annulus. T...

Clay‐rich shale poses substantial challenges to establishing well integrity during drilling, operation and abandonment of wells used in oil and gas production, CO₂ sequestration, and other waste disposal activities. We review problems created by shale for borehole stability, zonal isolation, and lon...