基于对称变换的水驱特征曲线趋势分析方法

发布时间：2018-08-14 17:35

【摘要】：水驱特征曲线趋势分析是预测油田生产动态的重要方法。渗流特征方程作为油水相对渗透率比与含水饱和度关系曲线的表征形式,决定了相应的水驱特征曲线关系式。现有渗流特征方程局限于某一含水阶段的表征,人为割裂了渗流过程的整体性,导致相应的水驱特征曲线趋势分析无法充分利用早期生产资料,限制了预测油田生产动态的能力。为此,基于系统论的整体性思想重新审视了油水两相渗流特征,指出油水两相渗流过程呈近似的对称性,对称中心同时也是从油相渗流优势过渡到水相渗流优势的唯一拐点。根据油水两相渗流特征提出了新的渗流特征方程,完成了相应水驱特征曲线关系式的推导,并建立了新的水驱特征曲线趋势分析方法。新方法重视数据预处理,考虑油田系统结构变化,更具科学性。基于油水两相渗流的对称性特征,采取对称变换的新思路预测油田含水率上升趋势,充分利用了早期生产资料,大大提高了生产动态预测能力,对措施效果评价具有参考意义。
[Abstract]:Trend analysis of water drive characteristic curve is an important method to predict oilfield production performance. The percolation characteristic equation is used as the representation of the relation curve between oil-water relative permeability ratio and water saturation, which determines the corresponding relationship between water flooding characteristic curve and oil-water relative permeability ratio. The existing seepage characteristic equations are confined to the characterization of a certain water-cut stage, and the percolation process is artificially severed, which results in the corresponding trend analysis of the characteristic curve of water flooding being unable to make full use of the early production materials. It limits the ability to predict the production performance of oil fields. Therefore, based on the system theory, the characteristics of oil-water two-phase seepage flow are re-examined, and it is pointed out that the oil-water two-phase seepage process is approximately symmetric, and the symmetry center is also the only inflection point from the oil-phase seepage superiority to the water-phase seepage advantage. According to the characteristics of oil-water two-phase seepage, a new seepage characteristic equation is proposed, and the corresponding relationship of water drive characteristic curve is deduced, and a new trend analysis method of water drive characteristic curve is established. The new method pays more attention to data preprocessing and takes into account the structural changes of oil field system, which is more scientific. Based on the symmetry characteristics of oil-water two-phase seepage, a new idea of symmetry transformation is adopted to predict the rising trend of water cut in oil field, make full use of the early production materials, and greatly improve the ability of production dynamic prediction, which has reference significance for evaluating the effect of measures.
【作者单位】：中国地质大学(北京)能源学院;中国石油大学(北京)非常规天然气研究院;
【基金】：国家科技重大专项课题“新一代油藏数值模拟软件”(2011ZX05009-006)
【分类号】：TE357.6

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