页岩气藏压裂水平井物质平衡模型的建立

发布时间：2018-03-20 20:56

本文选题：页岩气　切入点：物质平衡方程　出处：《西南石油大学学报(自然科学版)》2017年02期 　论文类型：期刊论文

【摘要】：针对页岩气藏压裂水平井中裂缝、基质、游离气和解吸气等对产气量贡献比例定量计算的难点问题,开展了动态渗流分区的物质平衡模型的建立与分析研究,研究中采用了不同渗流区域内压力降传播速度及平均地层压力的计算方法,进行了动态渗流分区设计,给出了压裂液返排后储层受渗吸作用的含水饱和度计算方法,建立了由12项构成的综合物质平衡方程。通过模型的实例应用与分析,获得了气井生产的7个渗流阶段,揭示了不同生产时间的供气结构比例变化规律,认识到基质储层的游离气是气井长期生产的主要供给气来源,其次是解吸气。模型的建立简化了多尺度渗流方程的描述和复杂求解过程,为理论分析和现场应用提供了一种新的方法,也为深入理解和研究页岩气藏渗流特征提供了依据。
[Abstract]:Aiming at the difficult problems in quantitative calculation of the contribution ratio of fracture, matrix, free gas and suction to gas production in fractured horizontal wells of shale gas reservoir, the material balance model of dynamic seepage zone is established and analyzed. In the study, the calculation method of pressure drop propagation velocity and average formation pressure in different percolation area is adopted, and the dynamic seepage zone design is carried out, and the calculation method of water saturation for reservoir permeability absorption after fracturing fluid is given. A comprehensive material balance equation consisting of 12 items is established. Through the application and analysis of the model, seven percolation stages of gas well production are obtained, and the law of proportional variation of gas supply structure with different production time is revealed. Recognizing that the free gas of the matrix reservoir is the main source of gas supply for the long-term production of gas wells, followed by desorption, and that the establishment of the model simplifies the description of the multi-scale seepage equation and the complex solution process, It provides a new method for theoretical analysis and field application as well as a basis for further understanding and studying the percolation characteristics of shale gas reservoirs.
【作者单位】：中国石油大学(北京)石油工程学院;中国石油玉门油田勘探开发研究院;兰石能源装备工程研究院;
【基金】：中国石油大学(北京)校级基金(2462015YQ0215)
【分类号】：TE319

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