注采井组内井间示踪约束下的克里金剩余油饱和度分布预测模型

A Kriging Model of Predicting the Distribution of Residual Oil Saturation under the Interwell Tracer Constrained in Injection and Production Well Groups

剩余油分布及其预测是高含水期油田研究的主要内容之一,是提高采收率的重要依据。目前通过测井资料确定剩余油饱和度分布的方法效果都不理想。综合现有水动力学方法、油藏数值模拟模型或者利用克里金等数学方法,在井筒测井资料确定剩余油饱和度方法研究的基础上,充分考虑岩石骨架的非均质性,以及储层流体的渗流特性对剩余油饱和度分布的影响,结合井间示踪资料,利用改进的克里金方法确定剩余油饱和度分布。改进后的结果更能反映井间整体的剩余油饱和度分布,与实际情况更加符合,从而更好地表征井间剩余油饱和度分布规律,为油田调整开发方案和提高采收率提供更准确的井间剩余油分布的资料。

The distribution of residual oil and its prediction are one of the main contents of oil field in high water cut period.It is an important basis for enhancing oil recovery.The method of determining the distribution of residual oil saturation by logging data is not ideal at present.Combined with existing hydrodynamic method,reservoir numerical simulation model or Kriging and other mathematical methods,we think,on the basis of the study of the method for determining residual oil saturation in well logging data,we should consider the influence of the heterogeneity of the rock skeleton and the percolation characteristics of the reservoir fluid on the distribution of residual oil saturation.Using the improved Kriging method,it can determine the distribution of residual oil saturation under the interwell tracer test data.The improved results can reflect distribution of residual oil saturation in the interwell.They are more consistent with the actual situation,as can be a better grasp of the distribution of residual oil saturation in the wells.Then,it is providing more accurate data about the distribution of residual oil saturation in the wells for oil field adjustment,including the development plan and the improvement of oil recovery.