超低渗浅层砂岩油藏储层非线性渗流模型

发布时间：2018-07-15 10:58

【摘要】：以鄂尔多斯盆地渭北地区延长组浅层超低渗砂岩油藏为研究对象,基于储层岩石的应力-应变关系及应力敏感性实验研究认为,流体在渗流过程中,启动压力梯度是动态变化的。利用介质变形、应力敏感性及动态启动压力梯度等参数,采用实验方法、线性回归方法和对比法,根据非达西渗流方程,建立了超低渗浅层砂岩油藏渗流模型。结果表明:超低渗浅层砂岩油藏应力敏感模型与正常埋深储层的应力敏感性模型相似;相对于考虑静态启动压力梯度的超低渗砂岩油藏渗流模型,考虑动态启动压力梯度的超低渗砂岩油藏渗流模型,在同一泄油半径内日产油量小,并且随着泄油半径的增加,日产油量减小幅度越来越大,生产井"压降漏斗"变小、变缓。此结果与油田生产实际相吻合。
[Abstract]:Taking the shallow ultra-low permeability sandstone reservoir of Yanchang formation in Weibei area, Ordos Basin as the research object, based on the stress-strain relationship and stress sensitivity of reservoir rock, it is concluded that the fluid is in the process of percolation. The starting pressure gradient is dynamic. By using the parameters of medium deformation, stress sensitivity and dynamic starting pressure gradient, using the experimental method, linear regression method and contrast method, the percolation model of ultra-low permeability shallow sandstone reservoir is established according to the non-Darcy seepage equation. The results show that the stress-sensitive model of ultra-low permeability shallow sandstone reservoir is similar to that of normal buried sandstone reservoir, and that of ultra-low permeability sandstone reservoir considering static start-up pressure gradient. The percolation model of ultra-low permeability sandstone reservoir considering dynamic starting pressure gradient, the daily oil production is small in the same oil release radius, and with the increase of oil release radius, the daily oil production decreases more and more, and the "pressure drop funnel" of production well becomes smaller and slower. The results are in agreement with the actual production in the oil field.
【作者单位】：西安石油大学石油工程学院;
【基金】：中国石油科技创新基金项目“超深层储层孔隙演化、有利储层评价预测新方法”(2015D-5006-0106)
【分类号】：TE312

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