核磁共振在孔南官195断块剩余油挖潜中的应用

APPLICATION OF NMR IMAGING TECHNIQUE TO THE REMAINING OIL DISTRIBUTION AND POTENTIAL TAPPING MEASURERS IN GUAN 195 FAULT BLOCK OF KONGNAN AREA

大港油田孔南官195断块单井日产能力较低,层间层内矛盾恶化,部分油组水淹严重,剩余油分布规律认识不清.利用核磁共振技术,从微观角度研究不同流动单元的驱油特点和剩余油分布特点.研究发现:Ⅰ类流动单元样品驱油效率比Ⅱ类流动单元高7.47%,但Ⅱ类流动单元样品水驱后聚合物驱油效率提高6.35%,剩余油主要分布于油层动用程度差的流动单元中.在完善注采系统基础上,挖潜时对Ⅰ、Ⅱ类流动单元通过层间卡封和堵水调剖挖掘中上部剩余油,对Ⅲ、Ⅳ类流动单元采取补孔、打新井方式提高储量动用程度.采取一系列挖潜措施后,预计官195断块最终采收率将能提高5.1%.

The reservoir in Kong 1 member in Guan 195 Fault Block of Kongnan Area is Alluvial environment,there are a series of problems arising in its high water-cut stage, such as the low single well oil production,poor interlayer and inner contradictions, serious water flooding of oil layer, misunderstanding the rule of the remaining oil distribution. NMR imaging technique is applied to research the characteristics of oil displacement efficiency on different flow units from microscopic angel. The study reveals that the Oil displacement efficiency of ikind of flow units is 7.47% higher than that in the II kind of flow units, but after the water floodiing, the polymer displacement efficiency of II kind of flow units can recovery 6.35% more than tha in the ikind of flow units, in other words, remaining oil is mainly distributed in the flow units of low producing degree. Thereby, the treatment measurements for oil well of I and II kind of flow units are plugging and water plugging to recovery the remaining oil in the upper oil layers, the treatment measurements for oil well of Ili and IV kind of flow units are perforations adding and drilling new wells. After the implementation of the measures,it is predicted that the ultimate recovery rate will be enhanced 5.1%.