Wu Xuning, Li Zaoyuan, Hou Zhengmeng, Liu Jian, Huang Sheng, Su Donghua, Li Jin, Cao Cheng, Wu Lin, Song Weitao
National Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu 610500, P. R. China.
Research Centre of Energy Storage Technologies, Clausthal University of Technology, Goslar 38640, Germany.
ACS Omega. 2024 Apr 9;9(16):17741-17759. doi: 10.1021/acsomega.4c00475. eCollection 2024 Apr 23.
The cement sheath, serving as the primary element of well barriers, plays a crucial role in maintaining zonal isolation, protecting the casing from corrosion, and providing mechanical support. As the petroleum industry shifts from conventional to deep unconventional resources, the service environment for cement sheaths has become increasingly complex. High temperatures, high pressures, cyclic loading, and thermal stresses in downhole conditions have significantly increased the risk of cement sheath failure. A growing trend toward theoretical analysis of stress distribution, failure modes, and control mechanisms within the casing-cement sheath-formation system is evident. This paper comprehensively reviews theoretical research on cement sheath integrity from four key perspectives: (1) the concept of cement sheath integrity failure, (2) cement sheath constitutive models, (3) analytical models of the cement sheath-casing-formation system, and (4) numerical simulations of the cement sheath-casing-formation system. Through these discussions, this review provides profound insights into cement sheath integrity failure and offers valuable guidance for future research and practices.
水泥环作为井筒屏障的主要组成部分，在保持层间封隔、保护套管免受腐蚀以及提供机械支撑方面发挥着关键作用。随着石油工业从常规资源转向深层非常规资源，水泥环的服役环境变得越来越复杂。井下的高温、高压、循环载荷和热应力显著增加了水泥环失效的风险。对套管 - 水泥环 - 地层系统内应力分布、失效模式和控制机制进行理论分析的趋势日益明显。本文从四个关键视角全面回顾了水泥环完整性的理论研究：（1）水泥环完整性失效的概念；（2）水泥环本构模型；（3）水泥环 - 套管 - 地层系统的解析模型；（4）水泥环 - 套管 - 地层系统的数值模拟。通过这些讨论，本综述深入洞察了水泥环完整性失效问题，并为未来的研究和实践提供了有价值的指导。
