Failure mechanism and influencing factors of cement sheath integrity under alternating pressure

Deng, Kuan-Hai; Zhou, Nian-Tao; Lin, Yuanhua; Wu, Yangqing; Chen, Jie; Chen, Shu; Xie, Pengfei

doi:10.1016/j.petsci.2023.03.004

Cited by 7 publications

(1 citation statement)

References 18 publications

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“…2.1 Wellbore integrity failure law analysis Integrity of wellbores used for gas injection/production processes have been extensively studied in the literature and some general conclusions have been offered (Goodwin and Crook 1992;Thiercelin et al 1998;Bois et al 2012; Zhang and Eckert 2020; Deng et al 2023). However, only a few of these studies focused on the speci c locations where wellbore integrity is prone to failure (e.g., whether the failure happens near the formation interlayer, cement inner surface or outer surface, etc.…”

Section: Simulation Results Analysis and Judgment Criterionmentioning

confidence: 99%

Assessment of wellbore integrity failure risk and hazardous zones in depleted reservoirs underground gas storage during the operation processes

Wang,

Kuru,

Zhao

et al. 2023

Environ Sci Pollut Res

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Depleted reservoirs are widely used for underground gas storage due to their advantages of low construction cost and easy development. Under the in uence of complex geological conditions and frequent operations, the integrity of the wells in depleted reservoirs is prone to failure, which would potentially lead to gas leakage. In this study, by using a nite element based computational uid dynamics model, we have developed evaluation criteria for assessing the severity of the occurred wellbore integrity failure and the risk of the un-occurred wellbore integrity failures respectively to identify hazardous zones potentially prone to wellbore integrity failure. The study results indicate that the gas storage wellbore integrity failure is prone to occur inside the wellbore structure in the direction of the minimum ground stress near the lower boundary of the formation interlayer. The wellbore integrity failure hazardous zones are mainly concentrated at the formation interlayer boundaries. The practical guidelines and solutions derived from current research results can be used for environmental protection work to avoid pollution problems caused by natural gas leakage.

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