For carbon capture and storage operations, wells are used as a necessary conduit for injecting CO₂ at depth, but they can also act as leakage conduits if the cement seals are compromised. The specific objective of this research was to experimentally investigate the nature of self-healing of a fracture within cement under multiphase flow of CO₂ and brine, and to compare the findings with the predictions of a recently developed model. This was accomplished by flowing a multiphase mixture of supercritical CO₂ and brine through a cement fracture. The influent end of the fracture was degraded as evidenced by the formation of cracks across the surface. At the effluent end of the fracture, the initial aperture of 137 μm was reduced to 50 μm. This reduction by 87 μm compared well with an aperture reduction of 80 μm predicted by a recently developed model tested in this study. Self-healing of the fracture contributes to permeability reduction through the potential leakage pathway.

对于碳的捕获和存储操作，井被用作深度注入CO ₂的必要管道，但如果水泥密封受到破坏，它们也可以充当泄漏管道。这项研究的特定目标是通过实验研究在多相CO ₂和盐水的作用下水泥内部裂缝的自愈性质，并将发现与最近开发的模型的预测结果进行比较。这是通过使超临界CO ₂的多相混合物流动来实现的和盐水通过水泥破裂。裂缝的进水端已降解，这在整个表面均形成了裂缝。在骨折的流出端，最初的137μm孔径减小到50μm。与本研究中测试的最新开发模型预测的孔径减小80μm相比，减小了87μm。裂缝的自我修复有助于通过潜在的泄漏途径降低渗透率。