基于砂体结构的剩余油挖潜调整措施研究

Adjustment measures of remaining oil tapping based on sand body structure

大庆油田杏六区现已进入高含水开发后期,储层内部剩余油分布复杂,以小层作为研究对象分析剩余油的分布已不能满足后期剩余油研究的需要。因此,为了细化研究尺度,精细解剖杏六区储层砂体内部结构,总结出了5种典型的砂体结构特征,并重点讨论了砂体结构与剩余油形成及分布特征的对应性,最后有针对性地提出了具体的挖潜调整措施思路和方法,即补孔和堵水调整方案。方案共部署补射油水井57口,堵水井6口,方案实施后预计平均单井日增油量2.9 t,综合含水率下降6%。此方案对于处于高含水开发后期的老油田剩余油挖潜具有一定的指导作用。

The development of Xing 6 block of Daqing Oilfield has entered the later stage with high water cut. The distribution of remaining oil in reservoir is complex, so analyzing the remaining oil distribution by making sublayer as the research object can not meet the needs of the remaining oil research in the later stage. Therefore, the paper refined the internal sand body structure in Xing 6 block, summed up five typical characteristics of sand body structure,discussed the relationships of the sand body structure with the formation and distribution of remaining oil, and proposed corresponding strategies for tapping the potential remaining oil, namely reshooting and water plugging adjustment plan. The plan designs 57 reshooting wells, 6 water plugging wells. It is estimated that the average daily oil production of single well increases by 2.9 t, and comprehensive water cut decreases by 6% after the implementation of the plan. This plan has some guidance for tapping the potential remaining oil in maturing oilfield in the late stage of high water cut development.