海上深薄层稠油油藏转蒸汽驱提高采收率研究  

Feasibility study of EOR by conversion to steam flooding in a deep-thin offshore heavy oil reservoir

作　　者：李鑫[1] LI Xin(PetroChina Liaohe Oilfield Company,Panjin,Liaoning 124010,China)

机构地区：[1]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《世界石油工业》2023年第4期73-79,共7页World Petroleum Industry

基　　金：国家科技重大专项大型油气田及煤层气开发“辽河、新疆稠油/超稠油开发技术示范工程”(2016ZX05055)。

摘　　要：针对渤海湾地区海上M油田井深、井斜大、油层分散及井网不规则,在常规生产和蒸汽吞吐开发方式下采收率受限等问题,通过建立非均质三维地质模型、三相(水、油、气三相)四组分(水、油、氮气、二氧化碳)非均质热采模型开展数值模拟研究,采用室内实验与油藏类比等方法相结合,确定蒸汽驱为最优开发方式,利用一套层系、大井距不规则井网、定向井注汽定向井采油的组合形式,优化单位体积注汽速率在1.8~2.0 t/(d·hm^(2)·m),井底干度达到40%以上,采注比0.8~1.2,继续吞吐2~3轮后转蒸汽驱,预计实验井组采收率可达43.5%,较蒸汽吞吐方式可提高14.2%,实现该油田经济有效开发,也为同类油藏提高采收率提供借鉴。In order to meet the challenges of low recovery factor during conventional recovery and CSS in offshore M oilfield due to deep reservoir depth,high well deviation,large well spacing and irregular well pattern,by means of simulation study with het-erogeneous three phases(oil,water and gas)-four components(water,oil,nitrogen and carbon dioxide)thermal recovery model based on heterogeneous geological modeling,lab experiments and reservoir analogy,steam flooding with one layer system and irregular well pattern of directional injector and directional producer under well spacing is chosen as the best development meth-od.According to the simulation result,the optimized unit volume steam injection rate is 1.8~2.0 t/(d·hm^(2)·m),the bottom hole steam quality is expected to be over 40%,injection to production ratio is 0.8~1.2 and the recovery factor of steam flooding fol-lowed by 2 to 3 cycles of CSS is expected to be 43.5%which is 14.2%higher than that of CSS,realizing economical and effective development of the oilfield.The study result provides a reference for enhanced oil recovery(EOR)of similar reservoirs.

关 键 词：海上油田 稠油油藏 深薄层 蒸汽驱 提高采收率 

分 类 号：TE53[石油与天然气工程—油气田开发工程] TE357.44