分形拟三重介质致密油藏产能预测模型

发布时间：2018-03-11 11:03

本文选题：致密油　切入点：分形　出处：《断块油气田》2017年04期 　论文类型：期刊论文

【摘要】：致密油藏渗流机理复杂、产能预测难度大。文中引入分形理论,推导出基质、天然微裂缝、人工裂缝的分形孔隙度和分形表观渗透率。建立了考虑启动压力梯度及压敏效应的分形拟三重介质致密油藏数学模型,推导出模型压力解与动态供给边界的变化情况。在此基础上,建立了产能预测模型,结合实例数据完成模型验证,进行供给半径和产能的动态预测,并对非线性渗流参数进行敏感性分析。结果表明:供给半径随时间非线性增加,同一时刻,启动压力梯度及分形系数越大,供给半径越小;分形致密油藏产能受非线性渗流参数的影响,启动压力梯度越低,变形系数越小,分形系数越小,则日产量越高,反之日产量越低。
[Abstract]:The percolation mechanism of tight reservoir is complicated and the prediction of productivity is difficult. Fractal porosity and fractal apparent permeability of artificial fractures. A mathematical model of fractal quasi-triple medium dense reservoir considering starting pressure gradient and pressure-sensitivity effect is established. The pressure solution of the model and the change of the dynamic supply boundary are derived. On this basis, the productivity prediction model is established, and the model verification is completed with the example data, and the dynamic prediction of the supply radius and productivity is carried out. The sensitivity analysis of nonlinear seepage parameters shows that the supply radius increases nonlinearly with time, and at the same time, the larger the starting pressure gradient and fractal coefficient, the smaller the supply radius. The lower the starting pressure gradient, the smaller the deformation coefficient, and the smaller the fractal coefficient, the higher the daily production and vice versa.
【作者单位】：中国石油大学(北京)石油工程教育部重点实验室;中国石油新疆油田分公司勘探开发研究院;
【基金】：国家重点基础研究发展计划(973计划)项目“典型致密油藏开发系统优化研究”(2015CB250906)
【分类号】：TE328

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