倾斜层状油藏水驱效率预测模型

发布时间：2018-09-13 10:31

【摘要】：倾斜层状砂岩油藏具有倾角大、纵向非均质性强、厚度大等特点,而准确预测层状油藏的水驱效率可以为合理开发油田提供重要的依据。目前所研究的层状模型忽略了油藏倾角和重力的影响,为此针对层状油藏倾角大、受重力因素影响等情况,同时考虑油藏倾角、层内窜流及重力分异驱替条件,引入拟相对渗透率曲线,将物性按厚度进行加权平均,结合水驱油理论,建立了倾斜层状砂岩油藏水驱效率模型。计算结果表明,新模型计算结果与生产实际数据基本吻合,从而证明了新模型的可靠性和适用性。敏感性分析表明,当油藏倾角增大时,重力作用使得水沿油藏下部渗透率较小的油层流动,延缓了上部渗透率较大油层的见水时间,从而增大了驱替效率;流度比和渗透率变异系数越小,驱替效率越大。
[Abstract]:Inclined bedded sandstone reservoirs are characterized by large dip angle, strong longitudinal heterogeneity and large thickness, and accurate prediction of water drive efficiency of layered reservoirs can provide an important basis for rational development of oil fields. The stratiform model studied at present neglects the influence of reservoir inclination and gravity. In view of the large dip angle of stratified reservoir and the influence of gravity factors, the reservoir dip angle, interlayer channeling flow and gravity differential displacement conditions are taken into account at the same time. By introducing pseudo-relative permeability curve and weighted average physical properties according to thickness and combining with water flooding theory, a water drive efficiency model for inclined bedded sandstone reservoirs is established. The calculation results show that the new model is in good agreement with the actual production data, which proves the reliability and applicability of the new model. The sensitivity analysis shows that when the dip angle of the reservoir increases, the gravity makes the water flow along the reservoir with lower permeability, which delays the water breakthrough time of the upper permeability reservoir and increases the displacement efficiency. The smaller mobility ratio and permeability coefficient of variation, the greater the displacement efficiency.
【作者单位】：中国石油勘探开发研究院;
【基金】：中国石油天然气集团公司海外油气田开发关键技术研究课题“乍得厚油层岩性砂岩油藏注水开发技术”(2016D-4402)
【分类号】：TE357.6

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