孤东油田特高含水期剩余油分布规律研究

利用大量的生产、测井及监测等资料对孤东油田特高含水期剩余油分布的影响因素进行了研究,指出注采对应关系、大孔道、累积注入倍数等是影响剩余油分布的主要因素。归纳总结出了“两段三层四区”的剩余油分布规律,印剩余油主要富集于层内低渗透段、受夹层影响的低水淹段;层间状况差异大且物性差的层、累积注入倍数低的低水淹层及动用差或未动用的薄层;平面上动态注采对应差部位、受井闻渗流特征及大孔道等影响的滞留区、绕流区、起伏较大的微构造高部位。另外,对油层的认识程度也是一个不容忽视的潜力。同时探讨了老油田剩余油挖潜的主要方法,对矿场应用具有指导意义。

Research on remaining oil distribution rule in extra-high water cut stage of Gudong oilfield

Influencing factors of remaining oil distribution in extra -high water cut stage of Gudong oilfield are studied u-sing a large number of data of production, log and testing. It points out that injetion-production correlation, macroscopic channel, cumulative injection pore volume and so on are the main influencing factors of remaining oil distribution. The distribution rule is summarized as "two-section, three-layer, four-area". That is to say, the remaining oil is enriched in interlayer low-permeability section and low watered out section influenced by interlayer; formations with large difference between in-terlamination and poor physical property, low watered out layer with low injection pore volume and poor producing or nonproducing thin layer; the position of bad dynamic injection-production correlation in plane, lag area influenced by interwell percolating properties and macroscopic channel, bypassing area and largely rugged microstructure high position. In addition, the degree of knowing the oil-bearing formation is also a non-neglectful potential. The main methods of tapping the potential of remaining oil in old oilfield are discussed, which have direct significance in field application.