平顶山地下盐穴储气库泥岩夹层稳定性评价
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摘要
泥岩夹层在盐溶建腔阶段难以被溶蚀,盐层溶采后仍赋存于腔内。针对平顶山地下储气库在储气运行阶段,未被溶蚀的夹层因岩体流变性出现垮塌而影响储气库安全运行的难题,提出一种基于夹层垮塌时间的稳定性评价方法。首先,根据弹性板壳理论建立夹层力学模型,解得夹层局部破坏的极限应变;其次,根据夹层岩样蠕变实验,建立蠕变本构模型。最后,结合夹层力学模型与蠕变本构模型,建立垮塌时间计算模型,并利用基于PSO算法的Matlab程序对平顶山储气库夹层不同预设厚度的垮塌时间值计算,对临界垮塌厚度值进行反演计算。结果表明:随夹层厚度增加,其计算垮塌时间增大,夹层稳定性提高;厚度相同的夹层,其跨径越大,计算垮塌时间值越小,计算临界垮塌厚度值越大,即稳定性越差;对小于临界垮塌厚度的夹层,其在设计使用年限内垮塌失稳风险较高,反之则垮塌失稳风险较小。
A mudstone interlayer is difficult to be dissolved and is left inside the cavity after the cavity construction. For the operation period of gas storage, the problem of collapse of non-corroded mudstone interlayers due to strong rock rheology threatens the safe operation of gas storage. In this study, an interlayer stability evaluation method based on collapse time is proposed. First, an interlayer mechanic model was established based on the elastic mechanics theory and the threshold strain, when an interlayer partially collapsed,was solved. Second, according to the creep test results of mudstone interlayers in Pingdingshan region, a creep constitutive model was built up. Finally, the interlayer mechanic model and the creep constitutive model are combined to derive the model of the interlayer collapse time. Using Matlab program based on the PSO algorithm, the model can calculate the collapse time value of different preset thicknesses of the interlayer and compute for the critical collapse thickness. The result shows that the calculated collapse time increases with the increase in interlayer thickness and the interlayer stability is higher. For the mudstone interlayer of the same thickness, the greater its span, the shorter collapse time, the greater the calculated critical thickness, the worse the stability.Meanwhile, for an interlayer with less than critical collapse thickness, the risk of an interlayer collapse is higher within its service life;and vice versa.
A mudstone interlayer is difficult to be dissolved and is left inside the cavity after the cavity construction. For the operation period of gas storage, the problem of collapse of non-corroded mudstone interlayers due to strong rock rheology threatens the safe operation of gas storage. In this study, an interlayer stability evaluation method based on collapse time is proposed. First, an interlayer mechanic model was established based on the elastic mechanics theory and the threshold strain, when an interlayer partially collapsed,was solved. Second, according to the creep test results of mudstone interlayers in Pingdingshan region, a creep constitutive model was built up. Finally, the interlayer mechanic model and the creep constitutive model are combined to derive the model of the interlayer collapse time. Using Matlab program based on the PSO algorithm, the model can calculate the collapse time value of different preset thicknesses of the interlayer and compute for the critical collapse thickness. The result shows that the calculated collapse time increases with the increase in interlayer thickness and the interlayer stability is higher. For the mudstone interlayer of the same thickness, the greater its span, the shorter collapse time, the greater the calculated critical thickness, the worse the stability.Meanwhile, for an interlayer with less than critical collapse thickness, the risk of an interlayer collapse is higher within its service life;and vice versa.
引文
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丁国生,李春,王皆明,等.2015.中国地下储气库现状及技术发展方向[J].天然气工业,35(11):107-112.
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肖学兰.2012.地下储气库建设技术研究现状及建议[J].天然气工业,32(2):79-82+120.
王志荣,李亚坤,张利民,等.2015.薄层状盐岩地下储气库工程地质条件及可行性分析[J].工程地质学报,23(1):148-154.
王志荣,王泉更,张利民.2016.CSAMT与CYT联合探测法在深部盐穴储气库建设中的应用[J].工程地质学报,24(1):142-149.
王志荣,张利民,韩中阳.2014.平顶山盐田互层状盐岩蠕变特性与试验模型研究[J].水文地质工程地质,41(5):125-130+137.
韦杏琼.2009.基于粒子群算法的数值方法研究[D].广西民族大学.
吴家龙.2001.弹性力学[M].北京:高等教育出版社.
杨春和,李银平,屈丹安,等.2008.层状盐岩力学特性研究进展[J].力学进展,4:484-494.
姚强岭,李学华,瞿群迪,等.2011.泥岩顶板巷道遇水冒顶机理与支护对策分析[J].采矿与安全工程学报,28(1):28-33.
袁光杰,班凡生,赵志成.2016.盐穴储气库夹层破坏机理研究[J].地下空间与工程学报,12(3):675-679.
郑雅丽,赵艳杰,丁国生,等.2017.厚夹层盐穴储气库扩大储气空间造腔技术[J].石油勘探与开发,44(1):137-143.
朱卓慧,赵延林,徐燕飞,等.2011.八种典型岩石力学流变组合模型的教学研究[J].当代教育理论与实践,3(6):85-89.
Asgari A,Ramezanzadeh A and Jalali S M E.2012.Stability analysis of natural gas storage caverns in salt formations[C].Bremen:SMRI Fall2012 Technical Conference:1-18.
Bauer S J,Ehgartner B L,Levin B L,et al.1998.Waste Disposal in Horizontal Solution Mined Caverns Considerations of Site Location Cavern Stability and Development Considerations[C].SMRI Fall Meeting:33-38.
Bekendam R R F and Paar W A.2002.Induction of Subsidence by Brine Removal[C].SMRI Fall Meeting:145-149.
Charnavel Y and Lubin N.2002.Insoluble deposit in salt cavern-test case[C].SMRI Fall Meeting:78-82.
Evans D J.2013.An Appraisal of Underground Gas Storage Technologies and Incidents for the Development of Risk Assessment Methodology[R].142:1-27.
Timoshenko S and Woinowsky K S.1959.Theory of Plates and Shells[M].New York:McQraw-Hill Book Companty.
蔡美峰.2013.岩石力学与工程[M].北京:科学出版社.
丁国生,李春,王皆明,等.2015.中国地下储气库现状及技术发展方向[J].天然气工业,35(11):107-112.
葛修润,卢应发.1992.循环荷载作用下岩石疲劳破坏和不可逆变形问题的探讨[J].岩土工程学报,(3):56-60.
韩中阳.2015.互层状盐岩储气库地表沉降机理与数值模拟研究[D].郑州:郑州大学.
李银平,施锡林,杨春和,等.2012.深部盐矿油气储库水溶造腔控制的几个关键问题[J].岩石力学与工程学报,31(9):1785-1796.
梁光川,王梦秋,彭星煜,等.2014.盐穴地下储气库溶腔形态变化数值模拟[J].天然气工业张硕,(7):88-92.
刘鸿文.1987.板壳理论[M].杭州:浙江大学出版社.
孟涛.2013.盐岩水平溶腔储库建造与运行稳定性数值模拟研究[D].太原:太原理工大学.
孟涛,梁卫国,陈跃都,等.2015.层状盐岩溶腔建造过程中石膏夹层周期性垮塌理论分析[J].岩石力学与工程学报,34(S1):3267-3273.
施锡林,李银平,杨春和,等.2011.多夹层盐矿油气储库水溶建腔夹层垮塌控制技术[J].岩土工程学报,33(12):1957-1963.
肖学兰.2012.地下储气库建设技术研究现状及建议[J].天然气工业,32(2):79-82+120.
王志荣,李亚坤,张利民,等.2015.薄层状盐岩地下储气库工程地质条件及可行性分析[J].工程地质学报,23(1):148-154.
王志荣,王泉更,张利民.2016.CSAMT与CYT联合探测法在深部盐穴储气库建设中的应用[J].工程地质学报,24(1):142-149.
王志荣,张利民,韩中阳.2014.平顶山盐田互层状盐岩蠕变特性与试验模型研究[J].水文地质工程地质,41(5):125-130+137.
韦杏琼.2009.基于粒子群算法的数值方法研究[D].广西民族大学.
吴家龙.2001.弹性力学[M].北京:高等教育出版社.
杨春和,李银平,屈丹安,等.2008.层状盐岩力学特性研究进展[J].力学进展,4:484-494.
姚强岭,李学华,瞿群迪,等.2011.泥岩顶板巷道遇水冒顶机理与支护对策分析[J].采矿与安全工程学报,28(1):28-33.
袁光杰,班凡生,赵志成.2016.盐穴储气库夹层破坏机理研究[J].地下空间与工程学报,12(3):675-679.
郑雅丽,赵艳杰,丁国生,等.2017.厚夹层盐穴储气库扩大储气空间造腔技术[J].石油勘探与开发,44(1):137-143.
朱卓慧,赵延林,徐燕飞,等.2011.八种典型岩石力学流变组合模型的教学研究[J].当代教育理论与实践,3(6):85-89.
Asgari A,Ramezanzadeh A and Jalali S M E.2012.Stability analysis of natural gas storage caverns in salt formations[C].Bremen:SMRI Fall2012 Technical Conference:1-18.
Bauer S J,Ehgartner B L,Levin B L,et al.1998.Waste Disposal in Horizontal Solution Mined Caverns Considerations of Site Location Cavern Stability and Development Considerations[C].SMRI Fall Meeting:33-38.
Bekendam R R F and Paar W A.2002.Induction of Subsidence by Brine Removal[C].SMRI Fall Meeting:145-149.
Charnavel Y and Lubin N.2002.Insoluble deposit in salt cavern-test case[C].SMRI Fall Meeting:78-82.
Evans D J.2013.An Appraisal of Underground Gas Storage Technologies and Incidents for the Development of Risk Assessment Methodology[R].142:1-27.
Timoshenko S and Woinowsky K S.1959.Theory of Plates and Shells[M].New York:McQraw-Hill Book Companty.
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