缝洞型油藏氮气泡沫辅助气驱技术及应用  

ASSISTANT GAS DRIVE TECHNOLOGY AND APPLICATION OF NITROGEN FOAM IN FRAC⁃TURED-VUGGY RESERVOIR

作　　者：睢芬[1] 魏宏洋[1] SUI Fen;WEI Hong-yang(NO.2 Oil Production Plant,Northwest Sub.Corporation,SINOPEC,Luntai,Xinjiang,841604,China)

机构地区：[1]中国石化西北油田分公司采油二厂,新疆轮台841604

出　　处：《新疆石油天然气》2020年第4期83-86,I0005,共5页Xinjiang Oil & Gas

摘　　要：塔河油田缝洞型油藏缝洞储集空间多样化,结构复杂,储层非均质性强,开发过程中地层能量下降,注水开发后期,因油水密度差,储集体上部富集大量剩余油。氮气驱可形成人工气顶驱替阁楼油,但也存在强烈的重力分异效果,且气液流度比大,造成气窜优势流道后驱油效率低。采油二厂通过氮气泡沫改善气驱效果,并在实践中调整配方,发现泡沫液可表现出在氮气泡沫驱和氮气泡沫调驱两种驱替机理。根据井况,设计多段塞泡沫,扩大气体波及体积,提高采收率。The storage space of suture hole in the tuhe oilfield is varied;the structure is complex;the reservoir heterogeneity is strong;the stratum energy decreases during the development process,and the water injection development period,due to the poor density of oil and water,accumulates a large amount of residual oil in the upper part of the reservoir.Nitrogen drive can form artificial gas top drive for attic oil,but there is also a strong effect of gravity differentiation,and the gas flow ratio is large,resulting in low efficiency of gas displacement after the air flow.The gas flooding effect was improved by nitrogen foam in the second oil production plant,and the formula was adjusted in practice.It was found that the foam liquid could show two displacement mechanisms in nitrogen foam flooding and nitrogen foam flooding.According to the well conditions,the design of Multi-segment plug foam,expand the volume of gas and increase the recovery rate.

关 键 词：缝洞型油藏 非均质性 重力分异 氮气 气窜 泡沫 提高采收率 

分 类 号：TE357.4[石油与天然气工程—油气田开发工程]