胜陀油田特高含水期油藏矢量层系井网产液结构调整研究

Well-pattern Regulation in Liquid Producing Structure of Vector Stratum Series at Extra-high Water-cut Stage in Shengtuo Oilfield

针对胜坨油田特高含水期剩余油分布特点,对研究区剩余油分布特征进行了研究,主要对研究区内平面、层间、层内3种类型的剩余油分布进行了详细分析。平面剩余油主要呈现为普遍分布型和差异富集型;层间剩余油分布呈现为均匀分布型和层间干扰型2种;层内剩余油以顶部富集型、均匀分布型和夹层控制型3种类型为主。在剩余油分布特征分析基础上提出了研究区矢量层系井网调整技术,主要分层间、层内、平面3种矢量调整技术进行了分析。层间矢量调整关键是通过细分层系实现剩余油有效动用;平面矢量调整主要通过井网、井距、液量合理化分析来实现;层内矢量调整的主要手段是水平井优化开发和堵水调剖。通过15个矢量调整区块试验,注采对应率、水驱储量控制程度、现状储量动用程度均达到90%以上,取得了满意的效果。

Aimed at the characteristics of the remaining oil distribution at the stage of extra-high water content in Shengtuo Oilfield,the features of remaining oil distribution was studied in the studied area.The remaining oil distribution in the plane,intra-layer and interlayer was analyzed in detail.The distribution styles of the plane remaining oil were pervasive distribution and differential enriched styles,the distribution styles of the intrabed remaining oil were uniform distribution and interlayer interference styles,the distribution styles of interlayer remaining oil were top enriched style,uniform distribution style and interlayer controlled style.On the basis of studying remaining oil,the technologies of well-pattern regulation in vector stratum series were summed up,which included the plane,intra-layer and interlayer well-pattern regulation technologies.The technology of the interlayer pattern regulation took the effect of enriching recovery ratio by separating minelayer,the technology of the plane pattern regulation took the effect of enriching recovery ratio by rationalizing well network,well spacing and liquid volume,the technology of the intra-layer pattern regulation took the effect of enriching recovery ratio by horizontal well development and water plugging and profile control.After it is tested in 15 wellblocks,the injection/production corresponding ratio,reserves control are all more than 90%,good result is achieved.