一种简单实用的含水饱和度分布模型

A Simple and Practical Water Saturation Distribution Model

含水饱和度分布模型作为水驱油理论的重要组成部分,常应用于水驱特征曲线理论分析及岩心驱替实验参数处理。针对出口端含水饱和度与油水两相区平均含水饱和度表达式之间的非线性特征导致矿场应用难、包利索夫模型开发末期偏差较大等问题,基于非活塞式水驱油理论及含水率定义,建立了一种简单实用的含水饱和度分布新模型。通过X-CT扫描水驱油实验结果,定量刻画岩心轴向含水饱和度分布,并结合矿场生产井剩余油饱和度监测数据,通过归一化处理,验证了平均含水饱和度与出口端含水饱和度之间双对数关系的合理性,且在中高含水期应用具有更高精度。新建含水饱和度分布模型为矿场尺度的水驱油藏开发潜力评价、剩余油分布规律研究等提供了有力的技术支撑,对于水驱开发油田增产挖潜具有重要意义。

The water saturation distribution model is an important part of water displacing oil theory.It is often used in theoretical analysis of water-driving-curve and processing of experimental parameters of core displacement.Aiming at problems such as difficulties in field application because of the non-linear characteristics of the expression between water saturation outlet and average water saturation in the oilwater two-phase zone,and significant deviations in the later stage of the development of the Bolysov model,a new simple and practical model for water saturation distribution was established based on the theory of non piston water flooding and the definition of water content.By X-CT scanning the results of water flooding experiments,the axial water saturation distribution of the core was quantitatively characterized,combined with the monitoring data of residual oil saturation in production wells of the field,through normalization data processing,the rationality of the double logarithmic relationship between the average water saturation and the outlet water saturation was testified.The accuracy is improved in application during medium to high water cut periods.The establishment of a new water saturation distribution model provides strong technical support for evaluating the development potential of water drive reservoirs in the field scale and studying the distribution pattern of remaining oil.It is of great significance for increasing production and tapping potential in water drive oil fields.