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Cementing interfaces debonding during methane deflagration fracturing based on measured bond strength and pressure data 认领 引用
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作者 Kun Jiang Shouchun Deng +3 位作者 Yixuan Li Xiaofang Jiang Weiqi Li Haibo Li 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2026年第4期2666-2685,共20页
The expansion of shale gas exploration into deeper reservoirs introduces increasing cementing challenges,primarily caused by cement sheath integrity failure through interfacial debonding.This study performed mechanica... The expansion of shale gas exploration into deeper reservoirs introduces increasing cementing challenges,primarily caused by cement sheath integrity failure through interfacial debonding.This study performed mechanical property characterization and interfacial bond strength evaluation of compositetoughened oil well cement to quantify the mechanical behavior of cement sheaths and cementing interfaces.Cavity pressure experiments were performed to obtain pressure-time curves of methane deflagrationfracturing under different fillingpressures.A whole-life-cycle well integrity model was established using a phased modeling approach,with the measured pressure data as input loads,and the cohesive zone model(CZM)was applied to simulate interfacial debonding evolution.Parametric analysis focused on the effects of perforation section length,deflagrationparameters(peak pressure,duration),and cement formulations on interfacial debonding.Numerical results reveal that the casingcement interface exhibits longer axial debonding lengths than the cement-formation interface,while the latter experiences faster debonding propagation.Sensitivity analysis highlights that composite toughened cement sheaths with reduced elastic modulus and enhanced bond strength significantly enhance wellbore integrity under methane deflagration.Interfacial debonding can be mitigated by optimizing perforation section length in staged fracturing operations and carefully controlling deflagration peak pressure and duration.This work enables predictive analysis of cement sheath debonding development and integrity evaluation,offering practical strategies for optimizing methane deflagration fracturing operations. 展开更多
关键词 Bond strength Cohesive zone method(CZM) Cement interface debonding Methane deflagration fracturing Wellbore integrity
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An unequal fracturing stage spacing optimization model for hydraulic fracturing that considers cementing interface integrity 认领 引用 被引量：5
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作者 Xu Han Fu-Ping Feng +5 位作者 Xiao-Chuan Zhang Jing Cao Jun Zhang Yu Suo Yan Yan Mao-Sen Yan 《Petroleum Science》 SCIE EI CAS CSCD 2023年第4期2165-2186,共22页
Determining reasonable fracturing stage spacing is the key to horizontal well fracturing.Different from traditional stage spacing optimization methods based on the principle of maximum stimulated reservoir volume,in t... Determining reasonable fracturing stage spacing is the key to horizontal well fracturing.Different from traditional stage spacing optimization methods based on the principle of maximum stimulated reservoir volume,in this paper,by considering the integrity of the wellbore interface,a fracture propagation model was established based on displacement discontinuity method and the competition mechanism of multifracture joint expansion,leading to the proposal of an unequal stage spacing optimization model.The results show that in the first stage,the interfacial fractures spread symmetrically along the axis of the central point during that stage,while in the second and subsequent stages,the interfacial fractures of each cluster extend asymmetrically along the left and right sides.There are two kinds of interface connectivity behaviour:in one,the existing fractures first extend and connect within the stage,and in the other,the fractures first extend in the direction close to the previous stage,with the specific behaviour depending on the combined effect of stress shadow and flow competition during hydraulic fracture expansion.The stage spacing is positively correlated with the number of fractures and Young’s modulus of the cement and formation and is negatively correlated with the cluster spacing and horizontal principal stress difference.The sensitivity is the strongest when the Young’s modulus of the cement sheath is 10-20 GPa,and the sensitivity of the horizontal principal stress difference is the weakest. 展开更多
关键词 Hydraulic fracturing Cementing interface Fracture propagation Fracturing stage spacing Wellbore integrity
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