Integrity Evaluation of the First Interface of Cement Sheath Based on Tensile Bonding Strength

doi:10.11885/j.issn.16745086.2021.04.29.13

Abstract

Abstract: The decrease of working fluid density in oil and gas wells or oil and gas exploitation will inevitably lead to a decrease in the internal pressure of the wellbore, causing the first interface of cement sheath to be stretched, causing the cement sheath and casing to peel off, resulting in micro-annular gaps. In the past, due to the lack of measuring device and method of the tensile bond strength, the shear bond strength or hydraulic bond strength of the first interface of cement sheath was used in the research and design of the sealing integrity of cement sheath, which resulted in deficiencies in the optimization of cement slurry system and the design of the sealing integrity of cement sheath. Therefore, according to the stress process of the cement sheath, a test device for the tensile bond sealing strength of the first interface of cement sheath is developed, and the corresponding measurement method is proposed. Based on the device, the cement slurry system is optimized and the integrity of the first interface is evaluated. By comparing the tensile bond strength and shear bond strength of the first interface of cement sheath, it is found that the former is about 0.37～0.45 of the latter. The use of shear bond strength to optimize the cement slurry system or evaluate the sealing integrity may lead to the first interface of cement sheath seal failure. It is found that the first interfacial tensile bond strength of latex cement slurry system is greater than that of expansion toughened cement slurry system and selfhealing cement slurry system under high pressure curing condition. Taking the tensile bond strength of the first interface of cement sheath as one of the important basis for the experimental design of cementing slurry and the evaluation of the sealing integrity of cement sheath can ensure the safe production and operation of oil and gas wells.

Key words: cement sheath, first interface, bond strength, tensile bond strength, sealing integrity

CLC Number:

TE21

YANG Yuanguang, FANG Zhongqi, YUAN Bin, XIE Yingquan, YAN Shuang. Integrity Evaluation of the First Interface of Cement Sheath Based on Tensile Bonding Strength[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(4): 183-190.

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http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2021/V43/I4/183

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