Block N1 is a botom water reservoir with poor recovery and great problems in actual production performance.The traditional bottom water drive mode cannot effectively solve the problem of low recovery,which has big difference with bottom water reservoirs in the same region,and contradiction between remaining oil distribution and bottomwater drive mode.In this research,reservoir engineering calculation and numerical simulation are used to prove the continuous distribution of mudstone interlayer in the middle of the reseryoir,which solved the contradiction of water drive mode,and clarified the reason for low recovery.However,as themudstone interlayer in the middle of the reservoir is continuously distributed,the small laver I is an edge water reservoir,which leads to the new problem that the water cut of the edge water reservoir rises too fast.Combined with the analysis of sedimentary facies characteristics,the permeability of well section and water breakthrough characteristics,it finally finds that the water drive mode of the old is that the edge water rushes along the hign permeablity channe,Througn the researen,the maior contraciction of actual production is solved,the distribution of remaining oil is accurately located,and the actua adjustment effect is highly consistentwith the prediction.It has important reference significance for adjustment in lower parts of high water cut reservoir and research of complex water drive mode.
关键词
底水油藏/水平井/水驱模式/隔夹层
Key words
bottom water reservoir/horizontal well/water drive mode/interlayer
万方数据