考虑渗流-应力耦合作用的层状盐岩界面裂缝扩展模型研究
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摘要
针对中国地下油气储库建设中所出现的含夹层盐岩问题,基于黏结裂缝模型,构建一种可以考虑层状盐岩地层界面启裂、裂隙扩展和流体渗漏的黏结单元,导出地层界面损伤演化方程、裂隙扩展准则以及缝内流体流动方程,建立考虑渗流-应力耦合作用的层状盐岩界面裂缝扩展模型,通过典型算例验证模型的有效性。研究层状盐岩地层界面启裂与裂隙扩展过程。研究结果表明:地层的渗透性和裂缝面漏失系数对地层界面裂隙扩展有明显影响,地层渗透性系数越小,地层开裂程度越大;而裂缝面漏失系数越大,地层开裂程度越弱,但流体渗漏程度加大。
According to the reality of bedded rock salt and clay interlayer for oil or gas storage in China, the cohesive element built in bedded salt rock was used to simulate the initiation, propagation and fluid seepage resulted from hydraulic loading by the cohesive zone model. The damage evolution equation, crack propagation criterion and fluid flow equation of interlayer were established. Based on the fluid-solid coupling theory of rock, the coupled interface crack propagation model of salt rock with interlayer was put forward and a typical example of application was presented to verify the validity of the model. Then, the crack propagation process of salt cavern was studied and the influence law of pore pressure, injection pressure and crack propagation was discussed in different conditions. The results show that the permeability of rock and leakage coefficient of crack has significant effects on the condition of crack propagation. The condition of crack aggravates with low permeability of rock and reduces with high leakage coefficient.
According to the reality of bedded rock salt and clay interlayer for oil or gas storage in China, the cohesive element built in bedded salt rock was used to simulate the initiation, propagation and fluid seepage resulted from hydraulic loading by the cohesive zone model. The damage evolution equation, crack propagation criterion and fluid flow equation of interlayer were established. Based on the fluid-solid coupling theory of rock, the coupled interface crack propagation model of salt rock with interlayer was put forward and a typical example of application was presented to verify the validity of the model. Then, the crack propagation process of salt cavern was studied and the influence law of pore pressure, injection pressure and crack propagation was discussed in different conditions. The results show that the permeability of rock and leakage coefficient of crack has significant effects on the condition of crack propagation. The condition of crack aggravates with low permeability of rock and reduces with high leakage coefficient.
引文
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[13]CHEN Zuorong.A new enriched finite element method with application to static fracture problems with internal fluid pressure[J].International Journal of Applied Mechanics,2015,7(3):1-30.
[14]ZHOU X J,BURBEY T J.Distinguishing fluid injection induced ground deformation caused by fracture pressurization from porous medium pressurization[J].Journal of Petroleum Science and Engineering,2014,121:174-179.
[15]王鸿勋,张士诚.水力压裂设计数值计算方法[M].北京:石油工业出版社,1998:104-196.WANG Hongxun,ZHANG Shicheng.Numerical calculation method for hydraulic fracturing design[M].Beijing:Petroleum Industry Press,1988:104-196.
[2]POPP T,KERN H.Monitoring the state of microfracturing in rock salt during deformation by combined measurements of permeability and P-and S-wave velocities[J].Physics and Chemistry of the Earth Part A:Solid Earth and Geodesy,2000,25(2):149-154.
[3]POPP T,KERN H,SCHULZE O.Evolution of dilatancy and permeability in rock salt during hydrostatic compaction and triaxial deformation[J].Journal of Geophysical Research:Solid Earth,2001,106(B3):4061-4078.
[4]李银平,杨春和,罗超文,等.湖北省云应地区盐岩溶腔型地下能源储库密闭性研究[J].岩石力学与工程学报,2007,26(12):2430-2436.LI Yinping,YANG Chunhe,LUO Chaowen,et al.Study on sealability of underground energy storage in deep salt formation in Yunying area,Hubei province[J].Chinese Journal of Rock Mechanics and Engineering,2007,26(12):2430-2436.
[5]梁卫国,杨春和,赵阳升.层状盐岩储气库物理力学特性与极限运行压力[J].岩石力学与工程学报,2008,27(1):22-27.LIANG Weiguo,YANG Chunhe,ZHAO Yangsheng.Physico-mechanical properties and limit operation pressure of gas deposit bedded salt rock[J].Chinese Journal of Rock Mechanics and Engineering,2008,27(1):22-27.
[6]黄小兰,杨春和,陈锋,等.潜江地区层状盐岩天然气储库密闭性评价研究[J].岩土力学,2011,32(5):1473-1478.HUANG Xiaolan,YANG Chunhe,CHEN Feng,et al.Tightness evaluation test on underground energy storage in bedded salt rock formation of Qianjiang area[J].Rock and Soil Mechanics,2011,32(5):1473-1478.
[7]周宏伟,何金明,武志德.含夹层盐岩渗透特性及其细观结构特征[J].岩石力学与工程学报,2009,28(10):2068-2073.ZHOU Hongwei,HE Jinming,WU Zhide.Permeability and meso-structure characteristics of bedded salt rock[J].Chinese Journal of Rock Mechanics and Engineering,2009,28(10):2068-2073.
[8]彭瑞东,武志德,周宏伟,等.层状盐岩中裂纹扩展规律的细观实验研究[J].岩石力学与工程学报,2011,30(S2):3953-3958.PENG Ruidong,WU Zhide,ZHOU Hongwei,et al.Mesoexperimental investigation on crack evolution in bedded salt rock[J].Chinese Journal of Rock Mechanics and Engineering,2011,30(S2):3953-3958.
[9]张耀平,曹平,赵延林,等.双重介质固气耦合模型及含夹层盐穴储气库渗漏研究[J].中南大学学报(自然科学版),2009,40(1):217-224.ZHANG Yaoping,CAO Ping,ZHAO Yanlin,et al.Dual media model for solid-gas coupling and gas seepage in rock salt natural gas storage with interlayers[J].Journal of Central South University(Science and Technology),2009,40(1):217-224.
[10]寇剑锋,徐绯,郭家平,等.黏聚力模型破坏准则及其参数选取[J].机械强度,2011,33(5):714-718.KOU Jianfeng,XU Fei,GUO Jiaping,et al.Damage lawa of cohesive zone model and selection of the parameters[J].Journal of Mechanical Strength,2011,33(5):714-718.
[11]ALFANO G.On the influence of the shape of the interface law on the application of cohesive zone models[J].Composites Science and Technology,2006,66:723-730.
[12]孙粤琳,沈振中,吴越健,等.考虑渗流-应力耦合作用的裂缝扩展追踪分析模型[J].岩土工程学报,2008,30(2):199-204.SUN Yuelin,SHEN Zhenzhong,WU Yuejian,et al.Analytic model for tracing crack propagation under coupled mechanicalhydrological environment[J].Chinese Journal of Geotechnical Engineering,2008,30(2):199-204.
[13]CHEN Zuorong.A new enriched finite element method with application to static fracture problems with internal fluid pressure[J].International Journal of Applied Mechanics,2015,7(3):1-30.
[14]ZHOU X J,BURBEY T J.Distinguishing fluid injection induced ground deformation caused by fracture pressurization from porous medium pressurization[J].Journal of Petroleum Science and Engineering,2014,121:174-179.
[15]王鸿勋,张士诚.水力压裂设计数值计算方法[M].北京:石油工业出版社,1998:104-196.WANG Hongxun,ZHANG Shicheng.Numerical calculation method for hydraulic fracturing design[M].Beijing:Petroleum Industry Press,1988:104-196.
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