不同扩孔半径下的钻孔水力压裂数值模拟研究
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摘要
利用RFPA数值模拟软件构建了钻孔水力压裂数值物理模型,分析了应力平衡状态对钻孔水力压裂的影响,研究了不同扩孔半径下的钻孔水压裂纹的发展演化规律。研究得出:破煤压力在钻孔开挖完待应力平衡后加载水压明显降低;随着钻孔扩孔半径的增加,破煤压力、分支裂纹初现水压、最终水压及平均范围角都将降低,水压主裂纹的长度将增加。研究为煤矿井下现场实施水力压裂技术提供了一定的理论支撑。
The numerical physical model of drilling hydraulic fracturing was established by using the RFPA numerical simulation software. The influence of stress balance on hydraulic fracturing of boreholes was analysed. The development and evolution of cracks in boreholes under different radius of reaming was researched. Results were obtained that,the coal seam initiation pressure was obviously reduced after the borehole was excavated to be stress-balanced. The coal seam initiation pressure,the initial branch fracture water pressure,the stable expansion water pressure and the average range angle of the crack decrease with the increase of the borehole enlargement radius. The length of the main hydraulic fracture increases with the increase of the borehole enlargement radius. The research provided some theoretical support for hydraulic fracturing technology on site.
The numerical physical model of drilling hydraulic fracturing was established by using the RFPA numerical simulation software. The influence of stress balance on hydraulic fracturing of boreholes was analysed. The development and evolution of cracks in boreholes under different radius of reaming was researched. Results were obtained that,the coal seam initiation pressure was obviously reduced after the borehole was excavated to be stress-balanced. The coal seam initiation pressure,the initial branch fracture water pressure,the stable expansion water pressure and the average range angle of the crack decrease with the increase of the borehole enlargement radius. The length of the main hydraulic fracture increases with the increase of the borehole enlargement radius. The research provided some theoretical support for hydraulic fracturing technology on site.
引文
[1]张国华.本煤层水力压裂致裂机理及裂隙发展过程研究[D].阜新:辽宁工程技术大学,2001.
[2]邓泽,康永尚.开发过程中煤储层渗透率动态变化特征[J].煤炭学报,2009,34(7):947-951.Deng Ze,Kang Yongshang. Dynamic variation character of coal bedmethane reservoir permeability during depletion[J]. Journal ofChina Coal Society,2009,34(7):947-951.
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[8]盛金昌.裂隙岩体渗流应力耦合研究综述[J].岩土力学,1998,6(2):92-98.Sheng Jinchang. Comment on the research of coupled stress andfluid flow in fractured rock mass[J]. Rock and Soil Mechanics,1998,6(2):92-98.
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[11]冷雪峰,唐春安.岩石水压致裂过程的数值模拟分析[J].东北大学学报(自然科学版),2002,23(11):1104-1107.Leng Xuefeng,Tang Chun'an. Numerical simulation and analysison heterogeneous and permeable rocks under hydraulic fracturing[J]. Journal of Northeastern University(Natural Science),2002,23(11):1104-1107.
[12]冷雪峰,杨天鸿.单孔岩石水压致裂过程的数值模拟分析[J].世界有色金属,2002(10):32-34.Leng Xuefeng,Yang Tianhong. Numerical simulation and analysisof rocks with single hole each under hydraulic fracturing[J].World Nonferrous Metals,2002(10):32-34.
[13]唐庆春.整体压裂垂直裂缝数值模拟方法研究[D].长春:吉林大学,2006.
[14]刘伟.水力压裂压力动态试井分析与增产效果提高方法研究[D].武汉:中国地质大学,2005.
[15]杨天鸿,唐春安.水压致裂过程分析的数值试验方法[J].力学与实践,2001,23(5):51-54.Yang Tianhong,Tang Chun'an. Numerical tests of progressive fail-ure in hydraulic fracturing[J]. Mechanics in Engineering,2001,23(5):51-54.
[16]饶孟余,杨陆武.中国煤层气产业化开发的技术选择[J].特种油气藏,2005,12(4):124.Rao Mengyu,Yang Luwu. Technology selection on industrializationdevelopment of coal bed methane in China[J]. Special Oil&GasReservoirs,2005,12(4):124.
[17] Tang CA. Numerical simulation of progressive rock failure and as-sociated seismicity[J]. IntJ Rock Mech Min Sci,1997,34(2):249-262.
[18]贺天才.晋城寺河矿井煤层气抽采实践与展望[J].中国煤层气,2005,2(3):16-18.He Tiancai. Practice and prospects of CMM recovery in Sihe Mineof Jincheng[J]. China Coalbed Methane,2005,2(3):16-18.
[19] Biot MA. General theory of three-dimensional consolidation[J].Journal of Applied Physics,1941,12(1):155-164.
[2]邓泽,康永尚.开发过程中煤储层渗透率动态变化特征[J].煤炭学报,2009,34(7):947-951.Deng Ze,Kang Yongshang. Dynamic variation character of coal bedmethane reservoir permeability during depletion[J]. Journal ofChina Coal Society,2009,34(7):947-951.
[3]张铁岗.矿井瓦斯综合治理技术[M].北京:煤炭工业出版社,2001.
[4]刘传义.演马矿顶板抽采巷水力压裂增透技术研究[D].焦作:河南理工大学,2012.
[5]李根生,刘丽,黄中伟,等.水力射孔对地层破裂压力的影响研究[J].中国石油大学学报(自然科学版),2006,30(5):42-45.Li Gensheng,Liu Li,Huang Zhongwei,et al. Study of effect of hy-draulic perforating on formation fracturing pressure[J]. Journal ofChina University of Petroleum(Edition of Natural Science),2006,30(5):42-45.
[6]倪小明,王延斌.不同构造部位地应力对压裂裂缝形态的控制[J].煤炭学报,2008,33(5):505-508.Ni Xiaoming,Wang Yanbin. Stress influence in different tectonicpositions on fracturing interstitial morphology[J]. Journal of ChinaCoal Society,2008,33(5):505-508.
[7]杜伊芳.国外水力压裂工艺技术现状和发展[J].西安石油学院学报,1994,9(2):26-30.Du Yifang. The present status and developing tendency of hydraulicfracturing technology abroad[J]. Journal of Xi'an Petroleum Insti-tute,1994,9(2):26-30.
[8]盛金昌.裂隙岩体渗流应力耦合研究综述[J].岩土力学,1998,6(2):92-98.Sheng Jinchang. Comment on the research of coupled stress andfluid flow in fractured rock mass[J]. Rock and Soil Mechanics,1998,6(2):92-98.
[9]杨增夫.煤矿重大事故预测和控制的岩层动力基础信息的研究[D].青岛:山东科技大学,2003.
[10]叶建平,秦勇.中国煤层气资源[M].徐州:中国矿业大学出版社,1998.
[11]冷雪峰,唐春安.岩石水压致裂过程的数值模拟分析[J].东北大学学报(自然科学版),2002,23(11):1104-1107.Leng Xuefeng,Tang Chun'an. Numerical simulation and analysison heterogeneous and permeable rocks under hydraulic fracturing[J]. Journal of Northeastern University(Natural Science),2002,23(11):1104-1107.
[12]冷雪峰,杨天鸿.单孔岩石水压致裂过程的数值模拟分析[J].世界有色金属,2002(10):32-34.Leng Xuefeng,Yang Tianhong. Numerical simulation and analysisof rocks with single hole each under hydraulic fracturing[J].World Nonferrous Metals,2002(10):32-34.
[13]唐庆春.整体压裂垂直裂缝数值模拟方法研究[D].长春:吉林大学,2006.
[14]刘伟.水力压裂压力动态试井分析与增产效果提高方法研究[D].武汉:中国地质大学,2005.
[15]杨天鸿,唐春安.水压致裂过程分析的数值试验方法[J].力学与实践,2001,23(5):51-54.Yang Tianhong,Tang Chun'an. Numerical tests of progressive fail-ure in hydraulic fracturing[J]. Mechanics in Engineering,2001,23(5):51-54.
[16]饶孟余,杨陆武.中国煤层气产业化开发的技术选择[J].特种油气藏,2005,12(4):124.Rao Mengyu,Yang Luwu. Technology selection on industrializationdevelopment of coal bed methane in China[J]. Special Oil&GasReservoirs,2005,12(4):124.
[17] Tang CA. Numerical simulation of progressive rock failure and as-sociated seismicity[J]. IntJ Rock Mech Min Sci,1997,34(2):249-262.
[18]贺天才.晋城寺河矿井煤层气抽采实践与展望[J].中国煤层气,2005,2(3):16-18.He Tiancai. Practice and prospects of CMM recovery in Sihe Mineof Jincheng[J]. China Coalbed Methane,2005,2(3):16-18.
[19] Biot MA. General theory of three-dimensional consolidation[J].Journal of Applied Physics,1941,12(1):155-164.