煤岩弹性力学性质与煤层破裂压力关系
|
摘要
岩石弹性力学性质是储层水力压裂裂缝起裂的重要力学约束,解译弹性力学性质与煤层破裂压力间的数学关系对于气井压裂设计有一定作用。以沁水盆地郑庄区块51口煤层气井为对象,利用声波时差、体密度测井数据反演了近井煤岩弹性力学参数(弹性模量E、剪切模量G、体积模量K、泊松比v)值,计算了表征煤岩破裂实际耗能情况指标——破裂压力当量(P_t)值。通过数学回归发现:中低弹性模量软煤中弹性力学参数(E、G、K)与P_t呈线性正相关关系;对于高弹性模量(E>6GPa)硬煤,发育天然大裂隙煤层P_t较低且随模量(E、G、K)降低而增高(煤粉的堵塞效应),而致密煤层P_t随煤岩模量增大而快速升高。煤岩泊松比(v)与P_t间的关系则不同,高弹性模量硬煤P_t随煤岩泊松比(v)增大而快速升高,而中低模量软煤P_t先随v减小而升高(煤岩脱水效应),后与v呈正相关关系。
The elastic mechanical property of rock is a mechanical constraint for the fracture initiation in hydraulic fracturing.51 coalbed methane wells in Zhengzhuang blocks of Qinshui Basin are taken as the object in this paper,the parameters of elasticity mechanics(Young's modulus E,shear modulus G,bulk modulus K,Poisson's ratio v)of No.3 coal near wellbore were calculated based on the acoustic,density logging data,and meanwhile the values of equivalent fracture pressure(P_t)which represent energy consumption were figured out.Based on regression,two patterns of relationship between the elastic mechanical parameters(E,G,K)and P_t were proposed.In soft coal with medium and low modulus,there is a positive correlation between them,for high-modulus hard coal,P_t is low when the coal develops natural fracture and P_t increases with the decrease of parameters(E,G,K)with the blockage effect of coal fines,whereas P_t increases rapidly with the increase of parameters(E,G,K)when the coal is stiffness.The relationship between v and P_t in coal is inversely related to above.P_t increases rapidly with the increase of vin high modulus hard coal,while in medium and low modulus soft coal Ptincreases with the decrease of vfirstly by the extrusion effect of pore water in coal,and then it is positively correlated with v.
The elastic mechanical property of rock is a mechanical constraint for the fracture initiation in hydraulic fracturing.51 coalbed methane wells in Zhengzhuang blocks of Qinshui Basin are taken as the object in this paper,the parameters of elasticity mechanics(Young's modulus E,shear modulus G,bulk modulus K,Poisson's ratio v)of No.3 coal near wellbore were calculated based on the acoustic,density logging data,and meanwhile the values of equivalent fracture pressure(P_t)which represent energy consumption were figured out.Based on regression,two patterns of relationship between the elastic mechanical parameters(E,G,K)and P_t were proposed.In soft coal with medium and low modulus,there is a positive correlation between them,for high-modulus hard coal,P_t is low when the coal develops natural fracture and P_t increases with the decrease of parameters(E,G,K)with the blockage effect of coal fines,whereas P_t increases rapidly with the increase of parameters(E,G,K)when the coal is stiffness.The relationship between v and P_t in coal is inversely related to above.P_t increases rapidly with the increase of vin high modulus hard coal,while in medium and low modulus soft coal Ptincreases with the decrease of vfirstly by the extrusion effect of pore water in coal,and then it is positively correlated with v.
引文
[1]Wang Hongxun,Zhang Shicheng.Numerical Calculation Method of Hydraulic Fracturing[M].Beijing:Petroleum IndustryPress,1998:1-8.王鸿勋,张士诚.水力压裂数值计算方法[M].北京:石油工业出版社,1998:1-8.
[2]Yu Shaocheng.The Technical Manuals of Hydraulic Fracturing[M].Beijing:Petroleum Industry Press,2010:405-409.俞绍诚.水力压裂技术手册[M].北京:石油工业出版社,2010:405-409.
[3]Carmichael R S.Handbook of Physical Properties of Rocks[M].Boca Raton,Florida:CRC Press,1982.
[4]Chen Yong,Lai Delun.Experimental study of the acoustic properties of rocks[J].Chinese Journal of Geotechnical Engineering,1984,6(9):94-101.陈颙,赖德伦.实验室中岩石声学性质的测量[J].岩土工程学报,1984,6(9):94-101.
[5]Bian Huiyuan,Wang Fei,Zhang Yonghao,et al.Experimental study of dynamic and static elastic parameters of tight sandstone under reservoir conditions[J].Chinese Journal of Rock Mechanics and Engineering,2015,30(S1):3045-3054.边会媛,王飞,张永浩,等.储层条件下致密砂岩动静态弹性力学参数实验研究[J].岩石力学与工程学报,2015,30(增1):3045-3054.
[6]Xiong Jian,Liang Lixi,Liu Xiangjun,et al.Experimental study on acoustic transmission through the Longmaxi Formation shale rock in south region of Sichuan Basin[J].Chinese Journal of Underground Space and Engineering,2014,10(5):1071-1077.熊健,梁利喜,刘向君,等.川南地区龙马溪组页岩岩石声波透射实验研究[J].地下空间与工程学报,2014,10(5):1071-1077.
[7]Hao Jialiang,Qin Guangsheng,Cai Qixin.Experimental study on acoustic and elastic parameters of rocks samples in Dongpu Depression[J].Journal of Oil and Gas Technology,2012,34(2):57-61.郝加良,秦广胜,蔡启新.东濮凹陷岩石声学和弹性力学参数特性试验研究[J].石油天然气学报,2012,34(2):57-61.
[8]Lu Shikuo,Wang Di,Li Yukun,et al.Research on three-dimensional mechanical parameters distribution of the tight sandstone reservoir in Daniudi Gasfield[J].Natural Gas Geoscience,2015,26(10):1844-1850.陆诗阔,王迪,李玉坤,等.鄂尔多斯盆地大牛地气田致密砂岩储层三维岩石力学参数场研究[J].天然气地球科学,2015,26(10):1844-1850.
[9]Riazi N,Clarkson C R,Ghanizadeh A,et al.Determination of elastic properties of tight rocks from ultrasonic measurements:Examples from the Montney Formation(Alberta,Canada)[J].Fuel,2017,196:442-457.
[10]Liu Weiguo,Han Dengyu,Miao Wentao,et al.Discussion on the calculation of mechanical parameters of rock with geophysical well logging data in Baizuishan region,Toksun,Xinjiang[J].Uranium Geology,2013,29(5):310-314.刘卫国,韩登宇,苗文韬,等.利用地球物理测井数据计算新疆托克逊县白嘴山地区岩石力学参数的方法探讨[J].铀矿地质,2013,29(5):310-314.
[11]Ullemeyer K,Lokají8ek T,Vasin R N,et al.Extrapolation of bulk rock elastic moduli of different rock types to high pressure conditions and comparison with texture-derived elastic moduli[J].Physics of the Earth and Planetary Interiors,2018,275:32-43.
[12]Meng Zhaoping,Zhang Jichang,Joachim Tiedemann.Relationship between physical and mechanical parameters and acoustic wave velocity of coal measures rocks[J].Chinese Journal of Geophysics,2006,49(5):1505-1510.孟召平,张吉昌,Joachim Tiedemann.煤系岩石物理力学参数与声波速度之间的关系[J].地球物理学报,2006,49(5):1505-1510.
[13]Fan Tiegang,Zhang Guangqing,Ding Yunhong,et al.Research on effective elastic mechanical properties of medium rank coal[J].Rock and Soil Mechanics,2014,35(S2):204-209.范铁刚,张广清,丁云宏,等.中阶煤有效弹性力学性质研究[J].岩土力学,2014,35(增刊2):204-209.
[14]Duc-Phi Doa,Nam-Hung Tran,Dashnor Hoxha,et al.Assessment of the influence of hydraulic and mechanical anisotropy on the fracture initiation pressure in permeable rocks using a complex potential approach[J].International Journal of Rock Mechanics and Mining Sciences,2017,100:108-123.
[15]Jin Z F,Li W X,Jin C R,et al.Anisotropic elastic,strength,and fracture properties of Marcellus shale[J].International Journal of Rock Mechanics and Mining Sciences,2018,109:124-137.
[16]Ge Hongkui,Chen Yong,Lin Yingsong.The micro mechanism of the difference between dynamic and static elastic parameters of rock[J].Journal of the University of Petroleum,China:Edition of Natural Science,2001,25(4):34-36.葛洪魁,陈颙,林英松.岩石动态与静态弹性参数差别的微观机理[J].中国石油大学学报:自然科学版,2001,25(4):34-36.
[17]Chen Yong.Mechanical Properties of Crustal Rocks-Basic Theory and Experimental Methods[M].Beijing:Seismological Press,1988:144-149.陈颙.地壳岩石的力学性能---基础理论与实验方法[M].北京:地震出版社,1988:144-149.
[18]Chen Lichao,Wang Shengwei,He Junhua,et al.Study of the impact of coal fines source collection on hydraulic fracturing effect[J].Journal of China University of Mining&Technology,2015,44(3):526-531.陈立超,王生维,何俊铧,等.煤粉源集合体对水力压裂效果的影响[J].中国矿业大学学报,2015,44(3):526-531.
[2]Yu Shaocheng.The Technical Manuals of Hydraulic Fracturing[M].Beijing:Petroleum Industry Press,2010:405-409.俞绍诚.水力压裂技术手册[M].北京:石油工业出版社,2010:405-409.
[3]Carmichael R S.Handbook of Physical Properties of Rocks[M].Boca Raton,Florida:CRC Press,1982.
[4]Chen Yong,Lai Delun.Experimental study of the acoustic properties of rocks[J].Chinese Journal of Geotechnical Engineering,1984,6(9):94-101.陈颙,赖德伦.实验室中岩石声学性质的测量[J].岩土工程学报,1984,6(9):94-101.
[5]Bian Huiyuan,Wang Fei,Zhang Yonghao,et al.Experimental study of dynamic and static elastic parameters of tight sandstone under reservoir conditions[J].Chinese Journal of Rock Mechanics and Engineering,2015,30(S1):3045-3054.边会媛,王飞,张永浩,等.储层条件下致密砂岩动静态弹性力学参数实验研究[J].岩石力学与工程学报,2015,30(增1):3045-3054.
[6]Xiong Jian,Liang Lixi,Liu Xiangjun,et al.Experimental study on acoustic transmission through the Longmaxi Formation shale rock in south region of Sichuan Basin[J].Chinese Journal of Underground Space and Engineering,2014,10(5):1071-1077.熊健,梁利喜,刘向君,等.川南地区龙马溪组页岩岩石声波透射实验研究[J].地下空间与工程学报,2014,10(5):1071-1077.
[7]Hao Jialiang,Qin Guangsheng,Cai Qixin.Experimental study on acoustic and elastic parameters of rocks samples in Dongpu Depression[J].Journal of Oil and Gas Technology,2012,34(2):57-61.郝加良,秦广胜,蔡启新.东濮凹陷岩石声学和弹性力学参数特性试验研究[J].石油天然气学报,2012,34(2):57-61.
[8]Lu Shikuo,Wang Di,Li Yukun,et al.Research on three-dimensional mechanical parameters distribution of the tight sandstone reservoir in Daniudi Gasfield[J].Natural Gas Geoscience,2015,26(10):1844-1850.陆诗阔,王迪,李玉坤,等.鄂尔多斯盆地大牛地气田致密砂岩储层三维岩石力学参数场研究[J].天然气地球科学,2015,26(10):1844-1850.
[9]Riazi N,Clarkson C R,Ghanizadeh A,et al.Determination of elastic properties of tight rocks from ultrasonic measurements:Examples from the Montney Formation(Alberta,Canada)[J].Fuel,2017,196:442-457.
[10]Liu Weiguo,Han Dengyu,Miao Wentao,et al.Discussion on the calculation of mechanical parameters of rock with geophysical well logging data in Baizuishan region,Toksun,Xinjiang[J].Uranium Geology,2013,29(5):310-314.刘卫国,韩登宇,苗文韬,等.利用地球物理测井数据计算新疆托克逊县白嘴山地区岩石力学参数的方法探讨[J].铀矿地质,2013,29(5):310-314.
[11]Ullemeyer K,Lokají8ek T,Vasin R N,et al.Extrapolation of bulk rock elastic moduli of different rock types to high pressure conditions and comparison with texture-derived elastic moduli[J].Physics of the Earth and Planetary Interiors,2018,275:32-43.
[12]Meng Zhaoping,Zhang Jichang,Joachim Tiedemann.Relationship between physical and mechanical parameters and acoustic wave velocity of coal measures rocks[J].Chinese Journal of Geophysics,2006,49(5):1505-1510.孟召平,张吉昌,Joachim Tiedemann.煤系岩石物理力学参数与声波速度之间的关系[J].地球物理学报,2006,49(5):1505-1510.
[13]Fan Tiegang,Zhang Guangqing,Ding Yunhong,et al.Research on effective elastic mechanical properties of medium rank coal[J].Rock and Soil Mechanics,2014,35(S2):204-209.范铁刚,张广清,丁云宏,等.中阶煤有效弹性力学性质研究[J].岩土力学,2014,35(增刊2):204-209.
[14]Duc-Phi Doa,Nam-Hung Tran,Dashnor Hoxha,et al.Assessment of the influence of hydraulic and mechanical anisotropy on the fracture initiation pressure in permeable rocks using a complex potential approach[J].International Journal of Rock Mechanics and Mining Sciences,2017,100:108-123.
[15]Jin Z F,Li W X,Jin C R,et al.Anisotropic elastic,strength,and fracture properties of Marcellus shale[J].International Journal of Rock Mechanics and Mining Sciences,2018,109:124-137.
[16]Ge Hongkui,Chen Yong,Lin Yingsong.The micro mechanism of the difference between dynamic and static elastic parameters of rock[J].Journal of the University of Petroleum,China:Edition of Natural Science,2001,25(4):34-36.葛洪魁,陈颙,林英松.岩石动态与静态弹性参数差别的微观机理[J].中国石油大学学报:自然科学版,2001,25(4):34-36.
[17]Chen Yong.Mechanical Properties of Crustal Rocks-Basic Theory and Experimental Methods[M].Beijing:Seismological Press,1988:144-149.陈颙.地壳岩石的力学性能---基础理论与实验方法[M].北京:地震出版社,1988:144-149.
[18]Chen Lichao,Wang Shengwei,He Junhua,et al.Study of the impact of coal fines source collection on hydraulic fracturing effect[J].Journal of China University of Mining&Technology,2015,44(3):526-531.陈立超,王生维,何俊铧,等.煤粉源集合体对水力压裂效果的影响[J].中国矿业大学学报,2015,44(3):526-531.
© 2004-2018 中国地质图书馆版权所有 京ICP备05064691号 京公网安备11010802017129号 地址：北京市海淀区学院路29号 邮编：100083 电话：办公室：(+86 10)66554848；文献借阅、咨询服务、科技查新：66554700 |