致密储层水平井压裂裂缝中支撑剂沉降与运移规律研究
发布时间：2018-12-27 11:11
【摘要】：混砂压裂液体系在井筒和裂缝中的运动规律是建立储层水力压裂设计理论的基础。由于压裂液体系自身流变性的多样性,加之非牛顿流体与固相颗粒两相体系流动规律的复杂性,致使对支撑剂在裂缝中的沉降运移规律及砂堤分布的认识等迄今仍有大量课题亟待攻关解决。本文以致密储层改造常用的滑溜水和线性胶压裂液为对象,实验研究了温度、浓度、静置时间对其流变性的影响,得到了部分致密储层常用压裂液的流性指数和稠度指数,建立了该体系的流变性表征模型;设计建立了一套专用装置,实验研究了支撑剂颗粒在滑溜水和线性胶中的静态沉降规律,并验证了评价了相关计算模型;分析了壁面因子、圆球度等因素对支撑剂沉降速度的影响,实验拟合了修正因子模型,建立了支撑剂沉降末速计算模型;利用相似性准则设计了平板裂缝模型,对支撑剂运移规律进行了实验,研究了不同施工参数对支撑剂运移速度、砂堤形状及平衡高度等因素的影响,提出了支撑剂整体运移速度表征方法以及近井地带填砂程度表征方法,同时对砂堤的形成过程进行了观测研究;建立了相交裂缝模型,对简单裂缝网络中的砂堤展布规律进行了探讨,实验研究了主裂缝和次级裂缝逼近角对砂堤分布规律的影响。研究成果对致密储层压裂改造具有一定的理论借鉴意义和施工参考价值。
[Abstract]:The movement of sand fracturing fluid system in wellbore and fracture is the foundation of reservoir hydraulic fracturing design theory. Due to the diversity of the rheological properties of fracturing fluids and the complexity of the flow law of non-Newtonian fluid and solid particle two-phase system, So far, there are still a lot of problems to be solved, such as the settlement and migration law of proppant in fracture and the distribution of sand dike. In this paper, the effects of temperature, concentration and statics time on rheological properties of slippery water and linear gel fracturing fluid are studied, and the fluidity index and consistency index of commonly used fracturing fluids in some dense reservoirs are obtained. The rheological characterization model of the system was established. A set of special equipment was designed to study the static settlement of proppant particles in slippery water and linear glue, and to verify the evaluation model. The influence of wall factor, sphericity and other factors on the settlement velocity of proppant is analyzed. The modified factor model is fitted and the final velocity calculation model of proppant settlement is established. Based on the similarity criterion, the slab fracture model is designed, and the law of proppant migration is tested. The effects of different construction parameters on the speed of proppant migration, the shape of sand embankment and the height of balance are studied. A method for characterizing the overall migration velocity of proppant and a method for characterizing the sand filling degree in the near well zone are proposed. The formation process of the sand embankment is observed and studied at the same time. The intersecting fracture model is established and the distribution law of sand embankment in simple fracture network is discussed. The influence of the approaching angle of main fracture and secondary fracture on the distribution of sand embankment is studied experimentally. The research results have certain theoretical reference significance and construction reference value for fracturing reconstruction of tight reservoir.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12
本文编号：2392977
[Abstract]:The movement of sand fracturing fluid system in wellbore and fracture is the foundation of reservoir hydraulic fracturing design theory. Due to the diversity of the rheological properties of fracturing fluids and the complexity of the flow law of non-Newtonian fluid and solid particle two-phase system, So far, there are still a lot of problems to be solved, such as the settlement and migration law of proppant in fracture and the distribution of sand dike. In this paper, the effects of temperature, concentration and statics time on rheological properties of slippery water and linear gel fracturing fluid are studied, and the fluidity index and consistency index of commonly used fracturing fluids in some dense reservoirs are obtained. The rheological characterization model of the system was established. A set of special equipment was designed to study the static settlement of proppant particles in slippery water and linear glue, and to verify the evaluation model. The influence of wall factor, sphericity and other factors on the settlement velocity of proppant is analyzed. The modified factor model is fitted and the final velocity calculation model of proppant settlement is established. Based on the similarity criterion, the slab fracture model is designed, and the law of proppant migration is tested. The effects of different construction parameters on the speed of proppant migration, the shape of sand embankment and the height of balance are studied. A method for characterizing the overall migration velocity of proppant and a method for characterizing the sand filling degree in the near well zone are proposed. The formation process of the sand embankment is observed and studied at the same time. The intersecting fracture model is established and the distribution law of sand embankment in simple fracture network is discussed. The influence of the approaching angle of main fracture and secondary fracture on the distribution of sand embankment is studied experimentally. The research results have certain theoretical reference significance and construction reference value for fracturing reconstruction of tight reservoir.
【学位授予单位】：中国石油大学(华东)
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TE357.12
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