塔河碳酸盐岩缝洞型油藏注氮气效果评价  

Effect evaluation of nitrogen injection in Tahe carbonate fractured vuggy reservoir

作　　者：陈园园[1] 刘学利[1] 杨占红[1] 郭臣[1] 邓鹏[2] CHEN Yuanyuan;LIU Xueli;YANG Zhanhong;GUO Chen;DNEG Peng(Northwest Oilfield Company,SINOPEC,Urumqi,Xinjiang 830011,China;Southwest Petroleum University,Chengdu,Sichuan 610500,China)

机构地区：[1]中国石化西北油田分公司,新疆乌鲁木齐830011 [2]西南石油大学,四川成都610500

出　　处：《石油地质与工程》2021年第1期82-86,共5页Petroleum Geology and Engineering

基　　金：国家科技重大专项“塔里木盆地碳酸盐岩油气田提高采收率关键技术示范工程”(2016ZX05053);国家科技重大专项(2016ZX05014–004–005)。

摘　　要：塔河油田现场氮气注入试验提采效果差异较大,目前的研究难以系统地评价注气开发的效果,亟需一套针对塔河油田的评价指标和界限标准。从注采状况、注采连通状况、注采平衡状况以及效果效益状况四个方面构建了塔河缝洞型油藏注气效果综合评价指标体系,并通过聚类分析方法建立了注氮气效果评价指标界限,形成了基于BP神经网络的综合评价方法,并对塔河油田203口注气单井进行了注气效果综合评价。研究结果表明,第四轮次注气后现有注气方案对剩余油的动用能力不足,缝洞型油藏复杂的连通状况形成了大量无效注气,是最终导致氮气替油效果不佳的主要原因。文中构建的缝洞型油藏注氮气效果评价体系和评价方法,解决了注氮气效果评价无依据的问题,为缝洞型油藏后期改善注氮气效果对策提供了科学依据,也为类似油藏注气效果评价提供了技术参考。As the effect of enhanced oil recovery of nitrogen injection in Tahe oilfield are quite different,it’s difficult to evaluate the effect of gas injection in Tahe oilfield,so a set of evaluation index and boundary standard for Tahe oilfield is needed.The comprehensive evaluation index system of gas injection effect in Tahe fractured vuggy reservoir is constructed from four aspects:injection production status,injection production connectivity,injection production balance and effect benefit.Through polymer type analysis,the evaluation index limit of nitrogen injection effect is established,and the comprehensive evaluation method based on BP neural network is formed.Besides,the gas injection effect of 203 gas injection wells in Tahe oilfield was evaluated.The research results indicate after the fourth round of gas injection,the existing gas injection schemes have insufficient production capacity for remaining oil,and a large number of ineffective gas injection are formed due to the complex connectivity of fractured vuggy reservoirs,which is the main reason for the poor effect of nitrogen oil displacement.The evaluation system and evaluation method of nitrogen injection effect in fractured vuggy reservoir solved the problem of no basis for evaluating the effect of nitrogen injection,offered scientific basis for improving nitrogen injection effect in later stage of fractured vuggy reservoir,and provided technical reference for similar reservoir gas injection effect evaluation.

关 键 词：缝洞型油藏 注氮气开发 效果评价 指标体系 聚类分析 

分 类 号：TE357.7[石油与天然气工程—油气田开发工程]