Schlumberger has launched the CemFIT Shield mud-sealing cement system at the Society of Petroleum Engineers Annual Technical Conference and Exhibition (SPE ATCE). The CemFIT Shield system provides the industry’s first zonal isolation technology specifically designed to improve isolation between hydraulic fracturing stages in long horizontal wells.
Long horizontal wells with multi-stage completions face drilling fluid removal challenges due to limited centralization and casing movement that increase the risk of zonal isolation due to drilling fluid channeling. The CemFIT Shield system interacts with residual non-aqueous drilling fluids to limit the detrimental effects of channeling and reduce fluid mobility, which lowers the risk of fracturing fluid migration from zone to zone behind the casing.
Extensive laboratory and field testing demonstrated that the CemFIT Shield system is compatible with common oilfield cementing additives, blending processes, equipment, and design considerations, making it easy to use in the field.
According to the company, the CemFIT Shield system improves zonal isolation in long horizontal wells to ensure efficient hydraulic fracturing, avoiding the need for additional investment to mitigate drilling fluid channeling.