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魏子俊,程万,蒋国盛,等. 基于边界元法的压裂液返排数值模拟[J]. 科学技术与工程, 2021, 21(8): 3082-3089.
WEI Zijun,et al.Numerical Simulation of Fracturing Fluid Flowback Behavior Using Boundary Element Method[J].Science Technology and Engineering,2021,21(8):3082-3089.
基于边界元法的压裂液返排数值模拟
Numerical Simulation of Fracturing Fluid Flowback Behavior Using Boundary Element Method
投稿时间:2019-12-31  修订日期:2020-11-29
DOI:
中文关键词:  水力压裂  返排模拟  边界元法  流固耦合
英文关键词:hydraulic fracturing  flowback behavior simulation  boundary element method  fluid-solid coupling
基金项目:国家重点研发计划项目(No.2018CFB378);国家自然科学青年科学基金项目(No.41802195 )
           
作者单位
魏子俊 中国地质大学武汉
程万 中国地质大学武汉
蒋国盛 中国地质大学武汉
周治东 中国地质大学武汉
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中文摘要:
      随着水力压裂技术在油气开采、地热开采等方面的广泛运用,为研究水力压裂后压裂液的返排问题并设计出科学合理的返排方案,采用边界元方法,建立了压后返排数值模型,综合考虑了裂缝变形过程与流体滤失及流动过程,构建了流固耦合非线性方程组,并采用牛顿迭代法进行了求解,以实现对返排全程的定量化控制。研究表明:裂缝延伸越深,裂缝宽度越窄,且随着返排进行,裂缝逐渐发生闭合;返排初期流体压力下降较快,返排后期降速减低,当井口压力降为大气压时,返排停止;在返排后期合理调整喷嘴尺寸,可加快返排,会导致流量升高、流速加快,井口压降曲线斜率明显增大。可见本模型能准确刻画出压裂液回流过程中裂缝宽度的分布与变化过程,能准确反映出流体压力、流量流速的变化规律,对非常规能源的生产开发具有一定的借鉴意义。
英文摘要:
      With the extensive application of hydraulic fracturing technology in oil and gas exploitation and geothermal exploitation, in order to study the rule of flowback and design a scientific and reasonable flowback scheme, a numerical model of fracturing fluid flowback has been established using boundary element method. The process of fracture deformation, fluid filtration and flow are considered comprehensively. A fluid-solid coupling nonlinear equation system has been constructed and solved by Newton iteration method, so as to realize the quantitative simulation of the whole flowback process. The results show that the deeper the fracture extends, the narrower the fracture is, and the fracture closes gradually with the flowback proceeding. Secondly, the fluid pressure decreases rapidly in the initial stage of flowback process and slows down in the later stage of flowback process. When the wellhead pressure drop to atmospheric pressure, the flowback process stops. Finally, adjustingt the nozzle size during the flowback later stage will cause the fracturing fluid flow to rise and the velocity to accelerate , resulting in a significant increase in the slope of the wellhead pressure curve. It is concluded that the model using boundary element method can accurately depict the distribution and changing process of fracture width, the model can accurately reflect the variation of fluid pressure, flow and velocity during the process of flowback, it can be used for reference in the production and development of unconventional energy.
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