鄂尔多斯盆地陇东页岩油水平井压裂交变力学与固井二界面失效特征

doi:10.3969/j.issn.1006-6535.2026.04.017

摘要/Abstract

摘要： 针对鄂尔多斯盆地陇东页岩油水平井分段压裂过程中固井第二胶结界面因胶结强度低易发生开裂引发层间窜流的问题,开展了交变载荷作用下固井固结体力学响应及界面失效演化规律研究。基于弹性力学与断裂力学原理,建立了涵盖压裂加载及卸载全过程的力学模型。通过三轴力学实验揭示了水泥石弹性模量随循环次数增加呈阶梯式下降的演化特征,并利用现场生产井数据验证了力学模型的准确性。研究表明:交变应力对第二胶结界面接触压力的削弱作用显著强于第一胶结界面;揭示了第二胶结界面裂缝扩展的能量耗散机制,明确了裂缝在特定工况下存在物理平衡边界,计算得到典型工况下第二胶结界面最大扩展长度为12.7 m。进一步分析发现,第二胶结界面失效长度随井口泵压及地应力的升高而增加;地层与水泥环的弹性模量差异越大,界面能量释放率衰减越慢,层间密封失效风险越大。研究成果可为该地区水平井压裂及现场固井施工提供科学、有效的技术指导,对压裂参数的优化选择及界限确定具有重要的学术价值与工程应用意义。

关键词: 水平井压裂, 固井二界面, 交变应力, 界面失效, 页岩油

Abstract: During staged fracturing of shale oil horizontal wells in the Longdong area of the Ordos Basin,the second cementing interface is prone to cracking because of its low bonding strength,which may further induce interlayer channeling.To solve this problem,the mechanical response of the cement sheath system under alternating loads and the evolution of interface failure were investigated.Based on the principles of elasticity and fracture mechanics,a mechanical model covering the entire loading and unloading process during fracturing was established.Triaxial mechanical experiments revealed a stepwise decrease in the elastic modulus of cement stone with increasing cycle number,and field data from production wells were used to validate the accuracy of the mechanical model.The results show that the weakening effect of alternating stress on the contact pressure of the second cementing interface is significantly stronger than that on the first cementing interface.The energy dissipation mechanism of crack propagation at the second cementing interface was clarified,and it was demonstrated that a physical equilibrium boundary exists for crack growth under specific operating conditions.The maximum propagation length of the second cementing interface under typical conditions was calculated to be 12.7 m.Further analysis indicates that the failure length of the second cementing interface increases with increasing wellhead pump pressure and in-situ stress.The greater the difference in elastic modulus between the formation and the cement sheath,the more slowly the interfacial energy release rate decays,the more significantly the risk of interlayer sealing failure increases.These findings can provide scientific and effective technical guidance for hydraulic fracturing of horizontal wells and field cementing operations in this area,and are of important academic value and engineering significance for optimizing fracturing parameters and determining their limits.

Key words: hydraulic fracturing of horizontal wells, second cementing interface, alternating stress, interface failure, shale oil

中图分类号:

TE357

欧阳勇, 张鹏鑫, 王婷婷, 曾栩洋, 李腾. 鄂尔多斯盆地陇东页岩油水平井压裂交变力学与固井二界面失效特征[J]. 特种油气藏, 2026, 33(4): 132-138.

Ouyang Yong, Zhang Pengxin, Wang Tingting, Zeng Xuyang, Li Teng. Alternating mechanics during fracturing and failure characteristics of the second cementing interface in shale oil horizontal wells in the Longdong Area,Ordos Basin[J]. Special Oil & Gas Reservoirs, 2026, 33(4): 132-138.

参考文献

[1] 杨振杰,姜晓强,吴志强,等.固井水泥环完整性模拟评价实验仪研究[J].钻井液与完井液,2013,30(6):9-12.
Yang Zhenjie,Jiang Xiaoqiang,Wu Zhiqiang,et al.Research on simulation evaluation instrument of the integrity of cement sheath[J].Drilling Fluid & Completion Fluid,2013,30(6):9-12.
[2] 王培义,马鹏鹏,张贤印,等.中低温地热井钻井完井工艺技术研究与实践[J].石油钻探技术,2017,45(4):27-33.
Wang Peiyi,Ma Pengpeng,Zhang Xianyin,et al.Drilling and completion technologies for geothermal wells with medium and low temperatures[J].Petroleum Drilling Techniques,2017,45(4):27-33.
[3] 杨春和,王磊,曾义金,等.考虑多因素的固井二界面胶结抗拉强度室内评价方法[J].石油钻探技术,2023,51(4):48-54.
Yang Chunhe,Wang Lei,Zeng Yijin,et al.A laboratory method for evaluating the bonding tensile strength of the cement-formation interface considering multiple factors[J].Petroleum Drilling Techniques,2023,51(4):48-54.
[4] 刘硕琼,李德旗,袁进平,等.页岩气井水泥环完整性研究[J].天然气工业,2017,37(7):76-82.
Liu Shuoqiong,Li Deqi,Yuan Jinping,et al.Cement sheath integrity of shale gas wells:a case study from the Sichuan Basin[J].Natural Gas Industry,2017,37(7):76-82.
[5] He Tao,Wang Tongtao,Shan Baodong,et al.Fatigue damage of wellbore cement sheath in gas storage salt cavern under alternating internal pressure[J].Rock Mechanics and Rock Engineering,2022,55(2):715-732.
[6] Maagi M,Pin G,Jun G.Influence of nano-Tio₂on the wellbore shear bond strength at cement-formation interface[J].Upstream Oil and Gas Technology,2020,5:100016.
[7] 柳洪华.油基钻井液滤饼对二界面胶结强度的影响研究[D].成都:西南石油大学,2016:39-40.
Liu Honghua.Study on the effect of oil-based drilling fluid filter cake on interfacial bonding strength at two interfaces[D].Chengdu:Southwest Petroleum University,2016:39-40.
[8] 陈大钧,雷鑫宇,李芹,等.双重强化界面胶结强度技术[J].钻井液与完井液,2014,31(1):57-59.
Chen Dajun,Lei Xinyu,Li Qin,et al.Double-reinforcement cementation strength technology on interface bonding[J].Drilling Fluid & Completion Fluid,2014,31(1):57-59.
[9] 杨春和,王同涛.深地储能研究进展[J].岩石力学与工程学报,2022,41(9):1729-1759.
Yang Chunhe,Wang Tongtao.Advance in deep underground energy storage[J].Chinese Journal of Rock Mechanics and Engineering,2022,41(9):1729-1759.
[10] 顾军,高兴原,刘洪.油气井固井二界面封固系统及其破坏模型[J].天然气工业,2006,26(7):74-76.
Gu Jun,Gao Xingyuan,Liu Hong.Two-interface isolation system of oil/gas well cementing and its damage model[J].Natural Gas Industry,2006,26(7):74-76.
[11] 杨浩.三轴地应力作用下固井二界面的稳定性[J].石油学报,2019,40(2):152-159.
Yang Hao.Stability of cement-formation interfaces under triaxial ground stress[J].Acta Petrolei Sinica,2019,40(2):152-159.
[12] 尹金丹.压裂过程中水平井固井二界面破坏力学模型研究[D].大庆:东北石油大学,2012:21-26.
YIN Jindan.Study on fracture mechanical model of horizontal well cementing second interface in fracturing process[D].Daqing:Northeast Petroleum University,2012:21-26.
[13] 程朝.页岩气水平井压裂水泥环力学完整性研究[D].成都:西南石油大学,2016:32-33.
Cheng Chao.Study on the mechanical integrity of the cement sheath in shale gas horizontal well fracturing[D].Chengdu:Southwest Petroleum University,2016:32-33.
[14] Hu F,Cheng L,Cheng T,et al.Three-dimensional numerical simulation of the influence of physical parameters of cement sheath on the stability of separated cementing interfaces[J].Chemistry and Technology of Fuels and Oils,2020,56:612-618.
[15] 张卫华.地层-水泥环(固井二界面)胶结机理探索分析[J].西部探矿工程,2021,33(10):109-111.
Zhang Weihua.Exploratory analysis of the bonding mechanism between formation and cement sheath (wellbore interface)[J].West-China Exploration Engineering,2021,33(10):109-111.
[16] 孙翀,幸雪松,王晓亮,等.声波测井技术评价水泥环密封完整性实验研究[J].当代化工,2022,51(5):1080-1084.
Sun Chong,Xing Xuesong,Wang Xiaoliang,et al.Experimental study on evaluation of cement sheath sealing integrity by acoustic logging technology[J].Contemporary Chemical Industry,2022,51(5):1080-1084.
[17] 包振山.返层封堵固井二界面封隔能力研究[D].大庆:东北石油大学,2023:30-69.
Bao Zhenshan.Research on the sealing ability of the second interface of cementing during the process of returning to seal[D].Daqing:Northeast Petroleum University,2023:30-69.
[18] 穆笛.交变压力作用下水平井套管-水泥环-地层固结体完整性研究[D].大庆:东北石油大学,2019:7-11.
Mu Di.Study on integrity of casing-cement ring-formation consolidated body in horizontal well under alternating pressure[D].Daqing:Northeast Petroleum University,2019:7-11.
[19] 周浪,曾青松,汪传磊,等.地下储气库注采井不同井段水泥环密封性能实验[J].天然气工业,2020,40(5):104-108.
Zhou Lang,Zeng Qingsong,Wang Chuanlei,et al.An experimental study on the sealing performance of cement sheath in different sections of injection/production wells of an underground gas storage[J].Natural Gas Industry,2020,40(5):104-108.
[20] 陈元千.Cinco-Ley模型在评价水力压裂效果中的应用及确定井控的原始地质储量[J].断块油气田,2025,32(4):529-535.
Chen Yuanqian.Application of Cinco-Ley model in evaluating hydraulic fractured effect and determining well-controlled original gas in place[J].Fault-Block Oil & Gas Field,2025,32(4):529-535.
[21] 任宗孝,徐有杰,樊晓辉,等.致密气藏压裂水平井多井干扰数值试井模拟模型[J].断块油气田,2025,32(2):339-345.
Ren Zongxiao,Xu Youjie,Fan Xiaohui,et al.Numerical well testing simulation model of multi-well interference for fractured horizontal wells in tight gas reservoirs[J].Fault-Block Oil & Gas Field,2025,32(2):339-345.
[22] 陈景华,朱海燕,赵鹏,等.考虑流量分配的水平井分段多簇压裂裂缝竞争扩展模拟[J].断块油气田,2025,32(2):315-321.　
Chen Jinghua,Zhu Haiyan,Zhao Peng,et al.Simulation of segmented multi-cluster fracturing fracture competitive propagation in horizontal wells considering flow allocation[J].Fault-Block Oil & Gas Field,2025,32(2):315-321.
[23] 陈峥嵘,齐宇,韩磊,等.非均质致密储层水平井分段压裂裂缝扩展模拟[J].大庆石油地质与开发,2024,43(2):53-60.
Chen Zhengrong,Qi Yu,Han Lei,et al.Fracture propagation simulation of horizontal well staged fracturing in heterogeneous tight reservoirs[J].Petroleum Geology & Oilfield Development in Daqing,2024,43(2):53-60.
[24] 闫炎,韩礼红,张华礼,等.空心微珠水泥减缓套管剪切变形的作用机理[J].天然气工业,2025,45(7):150-157.
Yan Yan,Han Lihong,Zhang Huali,et al.Mechanisms of hollow microsphere cement in mitigating casing shear deformation[J].Natural Gas Industry,2025,45(7):150-157.