Research on the Effect of Calcium Carbonate Whiskers on the Self-healing of Cement Stone Cracks Induced by CO2
GONG Peng1,2, CHENG Xiaowei1,2,*, WU Zhiqiang3, ZHANG Gaoyin1,2, ZHANG Chunmei1,2
1 School of New Energy and Materials, Southwest Petroleum University, Chengdu 610500, China 2 State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, China 3 CNOOC Research Institute Co., Ltd., Beijing 100028, China
Abstract: The cracking damage of the cement ring in CCUS downhole cementing is inevitable. In this work, high-concentration CO2 reacts with CaCO3 whiskers to induce CaCO3 deposition to improve the self-healing performance of cement-based material cracks. Compressive strength tes-ter, X-ray diffractometer (XRD), thermogravimetric analyzer (TG), environmental scanning electron microscope (ESEM) and X-ray micro-computed tomography (μ-CT) were used to study the influence of CaCO3 whiskers on the self-healing process of cement. The compressive strength results show that the compressive strength of cement mixed with CaCO3 whisker and without CaCO3 whisker after being carbonized for 28 days increases with the increase of carbonization time, and the growth rate of compressive strength are 572% and 528%, respectively. In addition, the XRD and TG results show that the mass loss and diffraction peaks of the sample Ca(OH)2 at the cracks of the cement gradually disappear with the increase of the carbonization time with the CaCO3 whisker cement. In addition, the phase analysis results show that with the prolongation of carbonation time, the mass loss of Ca(OH)2 on the crack surface of cement paste with calcium carbonate whiskers (0.58%) is significantly less than that of cement paste without calcium carbonate whiskers (2.68%). It shows that the addition of CaCO3 whiskers has a certain promotion effect on the carbonization of cement. The ESEM results show that on the surface of cement cracks, carbonized products of calcite and aragonite are formed and deposited on the cracks to make the cement cracks self-healing. The test results of μ-CT show that the self-healing rate of cement with CaCO3 whisker reached 55.24%, while the self-healing rate of cement without CaCO3 whisker was 18.32%. This indicates that mixing CaCO3 whiskers into cement is beneficial to the carbonization self-healing process of cement cracks under the CCUS downhole.
通讯作者:
* 程小伟,1998/9—2002/6于四川大学无机非金属材料研究方向获得学士学位;2003/9—2006/6于四川大学材料学研究方向获得硕士学位;2006/9—2009/6于西南石油大学油气田材料与应用方向获得博士学位。2016—2017,澳大利亚蒙纳士大学访问学者。现为西南石油大学新能源与材料学院教授、博士研究生导师,四川省学术和技术带头人后备,西南石油大学先进固井材料研究中心主任。目前主要从事胶凝复合材料与其在固井中应用、新型特种胶凝材料的研究、复杂工况下水泥石胶结与力学完整性研究以及有机/无机改性材料在固井工程应用等方面的研究工作。已发表论文80余篇,包括Corrosion Science、Composites Part B、Applied Surface Science、 Construction and Building Materials等期刊。chengxw@swpu.edu.cn
龚鹏, 程小伟, 武治强, 张高寅, 张春梅. 碳酸钙晶须对CO2诱导固井水泥石裂缝自愈合的影响研究[J]. 材料导报, 2023, 37(7): 21100107-7.
GONG Peng, CHENG Xiaowei, WU Zhiqiang, ZHANG Gaoyin, ZHANG Chunmei. Research on the Effect of Calcium Carbonate Whiskers on the Self-healing of Cement Stone Cracks Induced by CO2. Materials Reports, 2023, 37(7): 21100107-7.
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2023, Vol. 37 
