大庆油田葡一组油层聚驱后剩余油微观分布规律研究

Microscopic distribution law of remained oil in P1 reservoir of Daqing oilfield

通过天然岩心水驱油和聚合物驱油实验, 应用岩心磨片荧光分析技术, 利用面积法计算出了不同类型微观剩余油饱和度值, 同时定量地测定出水驱时存在的簇状、膜状、盲端和角隅等四种类型微观剩余油在聚驱后剩余的比例, 得出水驱后不同类型的微观剩余油在聚驱后降低幅度不同的结论: 膜状剩余油大幅度降低, 簇状和盲端剩余油降低幅度次之, 角隅剩余油降低幅度最小。给出了高、中、低不同强度水淹部位的微观剩余油分布规律: 高水淹部位四种类型剩余油均较少, 中水淹部位主要以盲端和角隅剩余油构成, 低水淹部位四种类型剩余油均较多, 尤其是膜状和簇状剩余油比例较大。

Taking microscopic remained oil as study target, the tests of both natural core water flooding and polymer flooding are conducted,and by applying advanced fluorescent analysis of core walfer,two analyzed microsections of the same cross section after both water and polymer flooding are respectively received for the same core. By means of area calculating method,different oil saturation value in each core walfer is obtained. At the same time, four kinds of microscopic remained oil including cluster-type, film-type, blind end, corner and so on have been quantitatively detected. After polymer flooding,according to the proportion of the remained oil,the following conclusion is drawn: different types of water flooded remained oil possess different reduction degree after polymer flooding: the reduced degree of film-type remained oil is more obvious, the less is cluster-type and blind end oil,the least is corner remained oil.Finally the microscopic remained oil distribution law for high,medium and low watered out layers is presented:there are few four types of remained oil in high watered out layer;the medium-watered out interval is mainly composed of blind end and corner forms of remained oil; more remained oil,especially film and cluster-types of remained oil is left in low watered out part.