超深纹层页岩断裂韧性演化规律研究

燕鸣飞; 金衍; 韦世明; 夏阳; 陈勉

doi:10.11911/syztjs.2025032

超深纹层页岩断裂韧性演化规律研究

燕鸣飞^{1, 2,},
金衍^{1, 2},
韦世明^{1, 2},
夏阳^{1, 2},
陈勉^{1, 2}

1.
中国石油大学（北京）石油工程学院，北京 102249
2.
油气资源与工程全国重点实验室（中国石油大学（北京）），北京 102249

基金项目: 国家自然科学基金重点项目“提高超深大斜度井压裂效率的关键力学问题研究”（编号：52334001）、国家自然科学基金青年项目“缝洞型碳酸盐岩大斜度井裂缝非平面扩展机理研究”（编号：42407252）、中国石油大学（北京）青年拔尖人才项目“超深层近井裂缝扩展转向流固耦合力学机理研究”（编号：2462023BJRC007）联合资助。

详细信息

作者简介:
燕鸣飞（1997—），男，山西临汾人，2020年毕业于中国石油大学（北京）石油工程专业，在读博士研究生，主要从事岩石力学与井壁稳定方面的研究工作。E-mail：15611788113@163.com

中图分类号: TE311⁺.2
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出版历程
- 收稿日期: 2023-12-20
- 修回日期: 2025-03-01
- 网络出版日期: 2025-03-25

Study on Evolution Law of Fracture Toughness of Ultra-Deep Layered Shale

YAN Mingfei^{1, 2,},
JIN Yan^{1, 2},
WEI Shiming^{1, 2},
XIA Yang^{1, 2},
CHEN Mian^{1, 2}

1.
College of Petroleum Engineering, China University of Petroleum(Beijing), Beijing, 102249, China
2.
National Key Laboratory of Petroleum Resources and Engineering(China University of Petroleum (Beijing)), Beijing, 102249, China

摘要

摘要:
为深入探究超深页岩储层中水力裂缝纵向穿层机制，针对高应力及层理性质对页岩断裂特性的影响进行了系统性分析。首先，利用三轴压缩试验获取了页岩力学参数；其次，采用颗粒离散元法构建了带围压的半圆板页岩三点弯曲数值模型，模拟了页岩在不同工况下的断裂过程。数值模拟结果表明，围压增大显著提升了页岩的断裂韧性，且层理面角度和密度对断裂韧性的影响随着围压增大而增强：相同围压下，断裂韧性随着层理面角度增加而降低，随着层理面密度增加呈现小幅差异，表明层理面密度对断裂韧性的强化作用优于层理面角度。基于此，拟合了断裂韧性与围压、层理面角度和密度的定量关系，并构建了不同围压及层理面性质对页岩断裂韧性的量化图版。研究结果揭示了高应力条件下超深页岩储层层理性质对断裂特性的复杂影响，为优化水力压裂方案、有效控制水力裂缝穿层行为提供了理论依据。
- 超深页岩 /
- 高应力 /
- 层理面 /
- 断裂韧性 /
- 颗粒流方法
Abstract:
To gain a comprehensive understanding of the longitudinal hydraulic fracture propagation mechanism in ultra-deep shale reservoirs, the study systematically analyzes the influence of high stress and bedding properties on shale fracture characteristics. Initially, shale mechanical parameters are obtained through triaxial compression experiments. Subsequently, a three-point bending numerical model of a semi-circular shale plate with confining pressure is constructed using the particle discrete element method to simulate the fracture process under various conditions. The numerical simulation results demonstrate that increasing confining pressure significantly enhances shale fracture toughness, and the influence of bedding plane angle and density on fracture toughness is amplified with increasing confining pressure. Specifically, at the same confining pressure, fracture toughness decreases with an increase in bedding plane angle and exhibits a minor variation with an increase in bedding plane density, indicating that bedding plane density has a greater strengthening effect on fracture toughness than bedding plane angle. Based on these findings, a quantitative chart illustrating the impact of varying confining pressure and bedding plane properties on shale fracture toughness is developed, and a quantitative relationship between fracture toughness and confining pressure, bedding plane angle, and density is fitted. The study reveals the complex influence of bedding properties on fracture characteristics under high stress conditions in ultra-deep shale reservoirs, potentially providing a theoretical basis for optimizing hydraulic fracturing designs and effectively controlling hydraulic fracture propagation behavior.
- ultra-deep shale /
- high stress /
- bedding surface /
- fracture toughness /
- particle discrete element method

HTML全文

图 1 半圆弯曲试样及加载示意图

Figure 1. Semi-circular bend sample and loading diagram

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图 2 不同围压下的层理页岩破坏试验结果

Figure 2. Test results of bedding shale

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图 3 不同围压下的层理页岩破坏模式

Figure 3. Failure mode of bedding shale

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图 4 层理页岩数值模型构建

Figure 4. Numerical model construction of bedding shale

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图 5 应力−应变曲线标定

Figure 5. Calibration of the stress-strain curve

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图 6 试样失效模式对比

Figure 6. Failure mode comparison of samples

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图 7 半圆板三点弯曲数值模型

Figure 7. Numerical models of SCB

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图 8 半圆弯曲试验和数值模拟获得的载荷−位移关系对比

Figure 8. Comparison of load-displacement relationship obtained by semi-circular bending experiment and numerical simulation

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图 9 不同围压下的页岩载荷−位移曲线

Figure 9. Load-displacement curves

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图 10 层理面密度0.80条/mm时的层理面角度−断裂韧性关系

Figure 10. Relationship between angle of bedding plane and K' （bedding density 0.80 piece / mm）

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图 11 不同层理面角度下SCB试样断裂模式

Figure 11. Fracture diagram of SCB samples under different confining pressures

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图 12 层理面角度45°时的层理面密度−断裂韧性关系

Figure 12. Relationship between density of bedding plane and K' (bedding angle 45°)

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图 13 不同层理面密度下的SCB试样断裂结果

Figure 13. Fracture diagram of SCB samples under different confining pressures

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图 14 权重系数a_σ和b_σ随围压的变化

Figure 14. Variations in the weight coefficients a_σ and b_σ with confining pressures

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图 15 不同围压下层理面性质对页岩断裂韧性影响的评价图版

Figure 15. Angle-density diagram of bedding plane for K' under different confining pressures

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表 1 数值模型细观胶结参数取值

Table 1 Meso-bond parameters of the numerical model

页岩	颗粒密度/ （kg·m⁻³）	颗粒有效模量/GPa	胶结有效模量/GPa	胶结刚度比	胶结拉伸强度/MPa	胶结内聚力/MPa	胶结摩擦角/（°）
基质	2 640	5.0	19.20	1.35	117.6	70.4	25
层理面	2 640	5.0	3.84	1.35	23.5	14.1	14

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表 2 页岩数值模型的断裂韧性计算结果

Table 2 Fracture toughness of the numerical model for shale

试样编号	F_max/kN	${K}'$	试样编号	F_max/kN	${K}'$
C₁−D₁−A₁	257.80	0.326	C₂−D₁−A₁	194.49	0.180
C₁−D₂−A₁	192.39	0.175	C₂−D₂−A₁	205.05	0.204
C₁−D₃−A₁	167.62	0.118	C₂−D₃−A₁	248.98	0.305
C₁−D₄−A₁	214.57	0.226	C₂−D₄−A₁	241.07	0.287
C₁−D₁−A₂	186.42	0.161	C₂−D₁−A₂	174.28	0.133
C₁−D₂−A₂	147.85	0.072	C₂−D₂−A₂	194.47	0.180
C₁−D₃−A₂	144.99	0.065	C₂−D₃−A₂	186.92	0.162
C₁−D₄−A₂	169.39	0.122	C₂−D₄−A₂	176.83	0.139

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