渗透率级差对多层非均质油藏水驱油影响规律研究  

Study on influence regularity of permeability contrast on water flooding in multilayer heterogeneous reservoirs

作　　者：符静宇 何宏 付平[2] 王洪学[2] 李禹 王兴坤 彭昊 FU Jingyu;HE Hong;FU Ping;WANG Hongxue;LI Yu;WANG Xingkun;PENG Hao(School of Petroleum Engineering,Yangtze University,Wuhan 430100 China;Research Institute of Petroleum Exploration and Development,Jilin Oilfield Company of PetroChina,Songyuan 138000,China)

机构地区：[1]长江大学石油工程学院,湖北武汉430100 [2]中国石油吉林油田分公司勘探开发研究院,吉林松原138000

出　　处：《能源化工》2018年第5期31-36,共6页Energy Chemical Industry

基　　金：国家自然科学基金(51604037)

摘　　要：针对目标FY油田区块油层物性差异大、油层纵向非均质严重、层间矛盾日益突出、水驱效率较低、注水开发效果差的问题,通过不同渗透率级差岩心并联驱油试验,研究了渗透率级差对多层非均质油藏水驱油的影响规律。结果表明:渗透率级差越大,储层非均质性越严重,注入水沿高渗层突进越严重,总体采收率越低;高渗层受层间干扰影响最小,中渗层次之,低渗层受层间干扰影响最大;当渗透率级差大于4时,低渗层不吸液。基于驱油效率损失指标和采收率指标,FY油田不同渗透率储层段间、段内渗透率级差宜控制在3以内,以克服层间干扰影响,达到更好的开发效果。Aiming at the problems of large difference of reservoir physical properties,serious longitudinal heterogeneity,increasingly serious contradiction between layers,low water drive efficiency and poor water flooding exploitation effect in target FY oilfield block,the influence regularity of permeability contrast on water flooding in multilayer heterogeneous reservoirs is studied by multiple flooding experiments of cores with different permeability contrast.The results show that the larger the permeability contrast,the worse the heterogeneous reservoirs is,and more injected water entering the high permeability formation,the total recovery efficiency is lower.The interlayer interference exerts the minimum effect on the high permeability formation,moderate effect on the medium permeability formation and greatest effect of on the low permeability formation.When the permeability contrast is larger than 4,the low permeability formation cannot imbibe water.Based on the oil-displacement efficiency loss index and recovery index,in order to overcome the effect of interlayer interference and achieve better exploitation efficiency,the permeability contrast of intersegment and inner segment of reservoirs with different permeability should be controlled less than 3.

关 键 词：非均质油藏 层间干扰 水驱油试验 渗透率级差 采收率 

分 类 号：TE341[石油与天然气工程—油气田开发工程]