碳酸钙晶须对CO<sub>2</sub>诱导固井水泥石裂缝自愈合的影响研究

doi:10.11896/cldb.21100107

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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.

Key words： cracks carbonization self-healing CaCO₃ whiskers CCUS

Published: 10 April 2023 Online: 2023-04-07

CLC number:

TE256

Fund:National Key Research and Development Program of China (2016YFB0303600) and the Sichuan Province Regional Innovation Cooperation Project (2021YFQ0045).

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	Articles by authors
	GONG Peng
	CHENG Xiaowei
	WU Zhiqiang
	ZHANG Gaoyin
	ZHANG Chunmei

Cite this article:

GONG Peng,CHENG Xiaowei,WU Zhiqiang, et al. Research on the Effect of Calcium Carbonate Whiskers on the Self-healing of Cement Stone Cracks Induced by CO₂[J]. Materials Reports, 2023, 37(7): 21100107-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21100107 OR http://www.mater-rep.com/EN/Y2023/V37/I7/21100107

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