利用径向积边界元方法计算动态逆向渗吸累积采收率

发布时间：2019-01-06 06:07

【摘要】：在开采超低渗透或致密油藏的过程中,水平井井筒周围会形成复杂的缝网,缝网将油藏分割成不同形状的基质块,当压裂液或者水在裂缝中流动时会与基质块大面积接触,在毛管压力作用下发生以动态逆向渗吸为主导的传质现象。为了准确描述针对任意形状基质块的动态逆向渗吸作用,利用基于边界元和径向积分理论的径向积边界元方法,建立适用于逆向渗吸的数学模型,通过与差分方法数值模拟结果和实验数据以及解析解进行对比,验证了所建渗吸模型的正确性,同时说明了径向积边界元方法适用于复杂形状基质块逆向渗吸累积采收率的计算;相对于差分方法,径向积边界元方法不用在基质块内部空间划分网格,使得动态逆向渗吸累积采收率的计算过程变得简单高效并且切合实际。
[Abstract]:In the process of producing ultra-low permeability or dense reservoir, complex fracture pattern will be formed around horizontal well bore. Fracture net will divide reservoir into different matrix blocks, and when fracturing fluid or water flows in fracture, it will contact with matrix block in a large area. Mass transfer under capillary pressure is dominated by dynamic reverse osmosis. In order to accurately describe the dynamic reverse osmotic action of arbitrary matrix blocks, a mathematical model suitable for reverse infiltration is established by using the radial product boundary element method based on boundary element and radial integral theory. By comparing with the numerical simulation results, experimental data and analytical solutions of the difference method, the correctness of the proposed seepage and suction model is verified. At the same time, the radial product boundary element method is suitable for the calculation of the cumulative recovery factor of the complex shape matrix block by reverse osmosis. Compared with the difference method, the radial integral boundary element method does not need to mesh in the inner space of the matrix, which makes the calculation process of dynamic reverse osmosis cumulative recovery become simple, efficient and practical.
【作者单位】：中国石油大学(北京)石油工程学院;中国石化石油勘探开发研究院;中国石油长庆油田分公司第六采油厂;
【基金】：国家自然科学基金项目“致密储层流-固相互作用机制及非线性渗流模型”(51674273) 国家“973”计划“陆相致密油高效开发基础研究”(2015CB250902)
【分类号】：TE327

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