基于扩展有限元的径向井压裂技术
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摘要
基于储层特征,利用ABAQUS扩展有限元建立了径向井模型,开展了不同条件下径向井力学特征及储层应力分布研究,分析了径向井压裂时裂缝扩展形态及规律,并通过物模试验验证了数值模拟结果的准确性。结果表明,径向井具有引导裂缝扩展、形成多裂缝的能力;径向井对压裂裂缝的引导效果与径向井方位角、水平地应力差、储层弹性模量、压裂液黏度等参数呈负相关,与径向井井径、储层泊松比、储层渗透率、施工排量等参数呈正相关;在双径向井夹角内形成的干扰应力场内可形成复杂的多裂缝;在低油价的形势下,通过径向井压裂技术实现低产低效井的有效利用,为老区低效井的挖潜提供参考。
Based on the reservoir characteristics and the application of XFEM for establishing the radial wells model by using ABAQUS,the research on stress distribution in reservoir and the mechanical characteristics of radial wells are studied under different conditions.The rules of radial wells fracturing and propagation are analyzed,the accuracy of the numerical simulation results is verified by the physical model test.The results show that the radial well is able to guide the propagation direction of fracture during fracturing,and it is possible to form multiple fractures.The effect of radial well on fracturing is negatively correlated with the parameters of its azimuth,horizontal ground stress difference,elastic modulus of reservoirs and viscosity of fracturing fluid,and it is positively correlated with the parameters of radial well diameter,reservoir Poisson's ratio,reservoir permeability and operation displacement.Complex multiple fractures can be formed in the interference stress field formed in the angle between two radial wells.In the situation of low oil prices,the technology of radial well fracturing can be use for an effective utilization of oil wells with low production and low efficiency to provide reference for tapping the potential of low efficiency wells.
Based on the reservoir characteristics and the application of XFEM for establishing the radial wells model by using ABAQUS,the research on stress distribution in reservoir and the mechanical characteristics of radial wells are studied under different conditions.The rules of radial wells fracturing and propagation are analyzed,the accuracy of the numerical simulation results is verified by the physical model test.The results show that the radial well is able to guide the propagation direction of fracture during fracturing,and it is possible to form multiple fractures.The effect of radial well on fracturing is negatively correlated with the parameters of its azimuth,horizontal ground stress difference,elastic modulus of reservoirs and viscosity of fracturing fluid,and it is positively correlated with the parameters of radial well diameter,reservoir Poisson's ratio,reservoir permeability and operation displacement.Complex multiple fractures can be formed in the interference stress field formed in the angle between two radial wells.In the situation of low oil prices,the technology of radial well fracturing can be use for an effective utilization of oil wells with low production and low efficiency to provide reference for tapping the potential of low efficiency wells.
引文
[1]龚迪光.径向井压裂裂缝起裂扩展规律与产能预测研究[D].东营:中国石油大学(华东),2016.
[2]李小龙,李建雄,肖雯,等.径向孔眼对井壁稳定性影响的数值模拟[J].断块油气田,2016,23(6):829～834.
[3]Gong D G,Qu Z Q,Guo T K,et al.Variation rules of fracture initiation pressure and fracture starting point of hydraulic fracture in radial well[J].Journal of Petroleum Science and Engineering,2016,140(4):41～56.
[4]李小龙,李建雄,周丽萍,等.径向井压裂定向起裂机理研究[J].西安石油大学学报(自然科学版),2017,32(2):46～52.
[5]李建雄,刘茂林,郭天魁,等.径向井引导水力裂缝扩展机理[J].断块油气田,2016,23(6):803～806.
[6]Tiankui Guo,Binyan Liu,Zhanqing Qu,et al.Study on initiation mechanisms of hydraulic fracture guided by vertical multi-radial boreholes[J].Rock Mechanics and Rock Engineering,2017,50(7):1767～1785.
[7]张丁涌,袁士宝,田相雷,等.低渗油藏径向水力射流压裂裂缝延伸规律[J].中国石油大学学报(自然科学版),2016,40(2):129～134.
[8]Tiankui Guo,Zhanqing Qu,Diguang Gong,et al.Numerical simulation of directional propagation of hydraulic fracture guided by vertical multi-radial boreholes[J].Journal of Natural Gas Science and Engineering,2016,35(8):175～188.
[9]李小龙,王冰,郭天魁,等.基于灰色关联的径向井摩阻实验[J].大庆石油地质与开发,2015,34(6):77～82.
[10] Xuan Fu,Gensheng Li,Zhongwei Huang,et al.Experimental and numerical study of radial lateral fracturing for coalbed methane[J].Journal of Geophysics and Engineering,2015,12(9):875～886.
[11]李小龙,肖雯,李建雄,等.径向孔眼辅助压裂裂缝形态[J].大庆石油地质与开发,2017,36(2):79～84.
[12]许华儒.低渗稠油油藏径向井压裂辅助蒸汽吞吐产能评价[D].东营:中国石油大学(华东),2016.
[13] Yu Tian,Zhanqing Qu,TiankuiGuo,et al.Theoretical research on radial wells orientating hydraulically created fracture directional extended[J].International Journal of Hydrogen Energy,2017,42(7):18358～18363.
[14]曲占庆,李小龙,李建雄,等.基于扩展有限元法的多径向井压裂裂缝形态[J].中国石油大学学报(自然科学版),2018,42(1):73～81.
[15]李小龙,许华儒,刘晓强,等.径向井压裂裂缝形态及热采产能研究[J].岩性油气藏,2017,29(6):154～160.
[2]李小龙,李建雄,肖雯,等.径向孔眼对井壁稳定性影响的数值模拟[J].断块油气田,2016,23(6):829～834.
[3]Gong D G,Qu Z Q,Guo T K,et al.Variation rules of fracture initiation pressure and fracture starting point of hydraulic fracture in radial well[J].Journal of Petroleum Science and Engineering,2016,140(4):41～56.
[4]李小龙,李建雄,周丽萍,等.径向井压裂定向起裂机理研究[J].西安石油大学学报(自然科学版),2017,32(2):46～52.
[5]李建雄,刘茂林,郭天魁,等.径向井引导水力裂缝扩展机理[J].断块油气田,2016,23(6):803～806.
[6]Tiankui Guo,Binyan Liu,Zhanqing Qu,et al.Study on initiation mechanisms of hydraulic fracture guided by vertical multi-radial boreholes[J].Rock Mechanics and Rock Engineering,2017,50(7):1767～1785.
[7]张丁涌,袁士宝,田相雷,等.低渗油藏径向水力射流压裂裂缝延伸规律[J].中国石油大学学报(自然科学版),2016,40(2):129～134.
[8]Tiankui Guo,Zhanqing Qu,Diguang Gong,et al.Numerical simulation of directional propagation of hydraulic fracture guided by vertical multi-radial boreholes[J].Journal of Natural Gas Science and Engineering,2016,35(8):175～188.
[9]李小龙,王冰,郭天魁,等.基于灰色关联的径向井摩阻实验[J].大庆石油地质与开发,2015,34(6):77～82.
[10] Xuan Fu,Gensheng Li,Zhongwei Huang,et al.Experimental and numerical study of radial lateral fracturing for coalbed methane[J].Journal of Geophysics and Engineering,2015,12(9):875～886.
[11]李小龙,肖雯,李建雄,等.径向孔眼辅助压裂裂缝形态[J].大庆石油地质与开发,2017,36(2):79～84.
[12]许华儒.低渗稠油油藏径向井压裂辅助蒸汽吞吐产能评价[D].东营:中国石油大学(华东),2016.
[13] Yu Tian,Zhanqing Qu,TiankuiGuo,et al.Theoretical research on radial wells orientating hydraulically created fracture directional extended[J].International Journal of Hydrogen Energy,2017,42(7):18358～18363.
[14]曲占庆,李小龙,李建雄,等.基于扩展有限元法的多径向井压裂裂缝形态[J].中国石油大学学报(自然科学版),2018,42(1):73～81.
[15]李小龙,许华儒,刘晓强,等.径向井压裂裂缝形态及热采产能研究[J].岩性油气藏,2017,29(6):154～160.
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