Abstract: Deepwater cementing in natural gas hydrate formations, due to the intense hydration of cement slurry, the phase equilibrium conditions of hydrates change, and the decomposition of hydrates is induced, which easily leads to the decline or even failure of cementing quality. To avoid such problems, the phase change reinforcing microcapsule materials can be added into the cement slurry to slow down the heat release of it du-ring the cementing process. And it can also improve the self-healing property of cement slurry while enhancing the impermeability and mechanical strength of it. In the experiment, Na2HPO4·12H2O works as the temperature-control core material while stearic acid as the wall material, and the E-51 epoxy resin is used to strengthen the self-healing property of cement stone as well as to glue the core material and the wall material together. And oil phase separation is used to coat the core material. When the ratio of the core material (Na2HPO4·12H2O) to the wall material (stearic acid) is 1∶1.5, the coating rate of the microcapsule is 87.5%, and the latent heat of phase change is 155.8 J/g while the temperature control range is from 30 ℃ to 95 ℃, and then there is a solid chemical-physical connection between the core material and the wall material. When different amounts of microcapsules are added into the cement slurry, it is found that the fluidity of the cement slurry improves with the increase of the amount of the microcapsule. The rupture strength can be increased by a maximum of 52.2% while the compressive strength can be increased by 47.1%, and the permeability can be reduced by 61.1% at most. As well, the temperature of the exothermic peak of the slurry can be reduced by 1.8 ℃ at most, and the retardation time can even reach 520 min.
杨国坤, 蒋国盛, 刘天乐, 覃鑫, 余尹飞. 控温自修复微胶囊的制备及在水合物地层固井水泥浆中的应用[J]. 材料导报, 2021, 35(2): 2032-2038.
YANG Guokun, JIANG Guosheng, LIU Tianle, QIN Xin, YU Yinfei. Analysis on Preparation of Temperature Controlled Self-repairing Microcapsules and Its Application in Cement Slurry for Hydrate Formation. Materials Reports, 2021, 35(2): 2032-2038.
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