井间示踪剂测试剩余油饱和度分布技术在卫95 块的应用

Application of Testing Remaining Oil Saturation with Interwell Tracer on W95 Block

牛雪莲 赵国瑜 顿金婷

中原石油勘探局采油工程技术研究院

Oil Production Enginering Technology Research Institute ,Zhongyuan Petroleum Exploration Bureau ,Henan 457001 ,P. R. China

通过对示踪剂产出曲线的数值分析,即可求得任意时刻的剩余油饱和度分布,从而对油藏进行精细描述,为油田开发生产提供指导。卫95 块油田是一个极复杂的断块油田,经过十几年的注水开发,层间矛盾越来越突出,水驱动用程度低,油藏中剩余油潜力大,应用井间示踪剂测试技术的目的就在于摸清卫95-127 井组地下剩余油的大小及分布状况,从而确定挖潜的主攻方向。结果表明,低渗层剩余油饱和度较高,主要集中在井组西部,大小为56 %左右,而高渗层剩余油饱和度较低,主要集中在井组西南部,大小约49 % ,分析结果与现场实际情况较为吻合。

Testing with interwell t racer is that the t racer slug is inputted from water injection wells and monitoring the production of the wells around ,so the production curve , the interwell tracer concent ration and time can be got . According to the numerical analysis of the curve, we get the distribution of remaining oil saturation with changing time , which is helpful for reservoir fine description and production development in the oil field. W95 block is a complicated fault block oil field. After water flooding development for more than ten years, the interlayer cont radiction becomes more and more serious. Water drive producing reserve is low, while the production potential of remaining oil is still high. The target of the testing is to figure out the distribution of the remaining oil saturation in W97-127 well group , and then to decide the direction for the next development period. The result shows that the west of the well group has a higher remaining oil saturation, which is about 56%, than the southwest, in which is about 49 %. The analysis result fit s closely with the production practice.