判断层间非均质性的新方法

以往表征层间非均质性多采用渗透率这一储层物性参数,但对于多层合采、注水开发、生产井段长和流体性质变化大的稠油油藏来说,用此难以准确评判储层层间非均质性强弱程度。在原油开采过程中,表示原油在地层中流动难易程度的参数是流动系数,因此提出了用流动系数变异程度表征层间非均质性的新方法,流动系数变异程度的计算借鉴了洛伦茨曲线法。选取渤海海域有代表性的3个稠油油田的测压井资料,统计了层间干扰系数与流动系数变异程度的关系,给出了判断同类油田层间非均质性强弱程度的标准,从而更加客观地表征了层间非均质性。此外,通过计算单井的流动系数变异程度,可以估算层间干扰系数的大小。

A new method to judge interlayer heterogeneity

Only permeability is usually used to characterize interlayer heterogeneity,but it may fail to judge this heterogeneity for heavy oil fields which are long in production intervals,change greatly in fluid properties with depth and are in commingling production.During oil production,it is flow coefficient that can measure oil flow in rocks,and a new method to characterize interlayer heterogeneity using the variation of flow coefficient is developed,in which the variation is calculated through Lorenz curve.For pressure test data from 3 selected heavy oil fields in Bohai bay,a relationship between interlayer interference coefficient and variation of flow coefficient has been established,resulting in a criterion to judge interlayer heterogeneity in similar heavy oil fields and a more objective characterization of interlayer heterogeneity. In addition,the interlayer interference coefficient can be estimated by calculating flow coefficient variation in single wells.