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

doi:10.11896/cldb.19110085

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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.

Key words： deep-water cementing hydrate formations cement slurry hydration heat release temperature control microcapsule self-repairing of cementing stone

Published: 28 January 2021

CLC number:

TB332

Fund:National Key Research and Development Plan Project “Microbial Cementing Technology for Lactating Mother Liquor Based on Dairy Wastewater” (2016YFE0204300), the Fundamental Research Founds for National University, China University of Geosciences (Wuhan).

About author:: Guokun Yanggraduated from China University of Geosciences (Wuhan) in 2018 with a Bachelor’s degree in engineering. Now he studies as a graduate student majoring in geological engineering in the College of Engineering in China University of Geosciences (Wuhan), and conducts researches under the guidance of Asso-ciate Professor Tianle Liu. His research has focused on cement slurry temperature control materials for deep water hydrate formation and self-repairing microcapsule.
Tianle Liureceived his B.E. degree in engineering from China University of Geosciences (Wuhan) in 2010 and received his Ph.D. degree in the drilling department of the State Mining University of St. Petersburg, Russia in 2013. In the same year, he returned to China University of Geosciences as an associate professor. His research interests are preparation of microcapsules, unconventional cementing and special strengthening technology.

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	YANG Guokun
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Cite this article:

YANG Guokun,JIANG Guosheng,LIU Tianle, et al. Analysis on Preparation of Temperature Controlled Self-repairing Microcapsules and Its Application in Cement Slurry for Hydrate Formation[J]. Materials Reports, 2021, 35(2): 2032-2038.

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http://www.mater-rep.com/EN/10.11896/cldb.19110085 OR http://www.mater-rep.com/EN/Y2021/V35/I2/2032

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