三轴应力下孔隙水泥环的压裂破坏机制

杨永明; 孙梦珂

doi:10.11858/gywlxb.20220544

三轴应力下孔隙水泥环的压裂破坏机制

doi: 10.11858/gywlxb.20220544

中国矿业大学(北京)力学与建筑工程学院, 北京　100083

基金项目: 国家自然科学基金（51874309）

详细信息

作者简介:
杨永明（1979-），男，博士，副教授，主要从事储层岩石水力压裂裂缝扩展机理及可压裂性评价方法研究. E-mail：yangym@cumtb.edu.cn

中图分类号: O346; TU528.44
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出版历程
- 收稿日期: 2022-03-22
- 修回日期: 2022-04-06
- 录用日期: 2022-04-08
- 刊出日期: 2022-12-05

Fracturing Failure Mechanism of Porous Cement Sheath under Triaxial Stress

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing 100083, China

摘要

摘要: 针对多孔水泥环的井下失效问题，制备了液硅水泥环岩心试样，开展了力学性能测试试验，同时利用Flac 3D自编程序构建了多孔“单层水泥环”和“水泥环/套管/水泥环”模型，模拟深部地应力作用下水泥环的压裂过程，探明在水压和地应力耦合作用下水泥环的变形破坏机制。研究表明：单层水泥环在应力作用下表现为脆性破坏，外层套管和水泥环的保护能有效提高水泥环的峰值载荷。研究结果为揭示水泥环密封失效的破坏机理提供了理论基础。
- 液硅水泥环 /
- 孔隙结构 /
- 应力分布 /
- 变形破坏
Abstract: The liquid silicon cement sheath samples were prepared, and the mechanical property testing experiments were carried out. Aiming at the problem of downhole failure of porous cement sheath, the porous “single-layer cement sheath” and “cement sheath-casing-cement sheath” models were established by using Flac 3D self-programming program to simulate the cement sheath fracturing process under the action of deep in-situ stress, and the deformation and failure laws of cement sheath under the coupling action of hydraulic pressure and in-situ stress were proved. The research shows that the single-layer cement sheath exhibits brittle failure under the action of stress, while under the protection of the outer casing and the cement sheath, the peak load of the cement sheath can be effectively increased. The research results provide a theoretical basis for revealing the failure mechanism of cement ring seal failure.
- liquid silicon cement sheath /
- porous structure /
- stress distribution /
- deformation failure

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图 1 巴西劈裂试验

Figure 1. Brazilian splitting test

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图 2 单轴压缩试验

Figure 2. Uniaxial compression test

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图 3 三轴压缩试验

Figure 3. Triaxial compression test

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图 4 液硅水泥环的单轴压缩曲线

Figure 4. Uniaxial compression curves of liquid silicon cement sheath

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图 5 液硅水泥环孔隙模型

Figure 5. Model of liquid silicon cement sheath with pores

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图 6 不同载荷比下单层液硅水泥环的塑性区分布

Figure 6. Plastic zone of single-layer liquid silicon cement sheath under different load ratios

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图 7 不同载荷比下双层水泥环的塑性区分布

Figure 7. Plastic zone of double-layer liquid silicon cement sheath under different load ratios

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图 8 不同载荷比下单层液硅水泥环的位移云图

Figure 8. Contour of displacement of sinle-layer liquid silicon cement sheath under different load ratios

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图 9 不同载荷比下双层液硅水泥环的位移云图

Figure 9. Contour of displacement of double-layer liquid silicon cement sheath under different load ratios

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图 10 不同载荷比下单层液硅水泥环的最小主应力分布云图

Figure 10. Contour of minimum principal stress of single-layer liquid silion cement sheath under different load ratios

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图 11 不同载荷比下双层液硅水泥环的最小主应力分布云图

Figure 11. Contour of minimum principal stress of double-layer liquid silion cement sheath under different load ratios

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表 1 液硅水泥环的物理力学参数

Table 1. Physical and mechanical parameters of liquid silica cement sheath

Tensile strength/
MPa Uniaxial compressive strength/MPa Modulus of elasticity/GPa Poisson’s ratio Cohesion/
MPa Internal friction angle/(°)

4.8 54.31 3.56 0.15 7.8 35

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Tensile strength/ MPa	Uniaxial compressive strength/MPa	Modulus of elasticity/GPa	Poisson’s ratio	Cohesion/ MPa	Internal friction angle/(°)
4.8	54.31	3.56	0.15	7.8	35

三轴应力下孔隙水泥环的压裂破坏机制

doi: 10.11858/gywlxb.20220544

作者简介: 杨永明（1979-），男，博士，副教授，主要从事储层岩石水力压裂裂缝扩展机理及可压裂性评价方法研究. E-mail：yangym@cumtb.edu.cn

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出版历程

Fracturing Failure Mechanism of Porous Cement Sheath under Triaxial Stress

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出版历程

目录

作者简介:
杨永明（1979-），男，博士，副教授，主要从事储层岩石水力压裂裂缝扩展机理及可压裂性评价方法研究. E-mail：yangym@cumtb.edu.cn