页岩夹层及压裂裂缝对蒸汽辅助重力泄油蒸汽腔扩展的影响  

The influence of shale interlayer and fracturing fracture on steam chamber expansion of SAGD

作　　者：鹿腾[1] 李兆敏[1] 韩继超[1] 林日亿[2] 高永荣[3] 

机构地区：[1]中国石油大学石油工程学院,山东东营257061 [2]中国石油大学储运与建筑工程学院,山东东营257061 [3]中国石油勘探开发研究院,北京100083

出　　处：《石油钻采工艺》2012年第1期95-99,共5页Oil Drilling & Production Technology

基　　金：国家高技术研究发展计划(863)项目"注气辅助SAGD技术研究及现场试验"(编号:SQ2009AA06Z2488110);中央高校基本科研业务费专项资金项目(编号:12CX06027A;10CX04014A)

摘　　要：为了研究储层非均质特征对SAGD蒸汽腔扩展的影响,通过顺序指示模拟方法(SISIM)建立了不同页岩夹层分布模式,基于油藏数值模拟定义了"上部蒸汽腔分数"、"下部蒸汽腔分数"、"总蒸汽腔分数"的概念,研究了不同页岩夹层分布模式和压裂裂缝形式对SAGD蒸汽腔扩展的影响。研究结果表明:随着地层内页岩夹层发育的增多,页岩夹层对蒸汽腔扩展的限制作用增强,并呈现出蒸汽腔垂向扩展减弱而水平方向扩展增强的趋势;不同页岩概率下总蒸汽腔分数与采收率呈现较好的线性函数关系;压裂裂缝能改善SAGD蒸汽腔扩展和开发效果,垂直裂缝通过扩大蒸汽腔垂向发育高度加快了SAGD泄油速度,开发效果好于水平裂缝;移位垂直裂缝可以降低垂直裂缝导致的注采井间蒸汽窜流,蒸汽腔扩展及开发效果都好于垂直裂缝。In order to study the effect of reservoir heterogeneity on steam chamber expansion in SAGD, the different distribution patterns of shale interlayer were built by sequential-indicator simulation （SISIM）. Three new concepts of upper steam chamber fraction, lower steam chamber fraction and total steam chamber fraction were defined on the basis of reservoir numerical simulation. The influences of different shale interlayer distribution patterns and fracturing fracture forms on steam chamber expansion of SAGD were studied. The research results showed that the more the shale interlayer developed in the reservoir, the stronger the steam chamber expansion in reservoir was limited by the shale interlayer, and the trends that vertical expansion steam chamber was weaken and horizontal expansion was enhanced appearently very clear with the shale interlayer development. Well linear functional relationship was set up between overall steam chamber fraction and oil recovery under different shale probabilities. The fracturing fracture could improve the performance of steam chamber expansion and SAGD development. The vertical fractures could accelerate oil drainage rate of SAGD by enlarging the vertical steam chamber height, which made the development effect of vertical fractures better than that of horizontal fractures. Besides, as the shifted vertical fractures could decrease steam cross flow between injection wells and production wells caused by vertical fractures, the steam chamber expansion and SAGD development effect of the shifted vertical fracture were both better than that of vertical fractures.

关 键 词：稠油 蒸汽辅助重力泄油 双水平井 数值模拟 页岩夹层 压裂裂缝 蒸汽腔 

分 类 号：TE345[石油与天然气工程—油气田开发工程]