体积压裂页岩油储层渗流规律及产能模型  

Seepage law and productivity model of stimulated reservoir volume in shale oil reservoirs

作　　者：高英[1] 朱维耀[1] 岳明[1] 李爱山[2] 张燎原[2] 宋洪庆[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083 [2]中石化胜利油田分公司采油工艺研究院,山东东营257000

出　　处：《东北石油大学学报》2015年第1期80-86,6,共7页Journal of Northeast Petroleum University

基　　金：国家科技重大专项(2011ZX05051);国家自然科学基金项目(11372033);提高油气采收率教育部重点实验室(东北石油大学)开发课题(NEPU-EOR-2012-003)

摘　　要：利用岩心实验,研究页岩油储层纳微米孔喉渗流规律.基于分形理论,采用双重分维(缝宽分维和迂曲分维),对体积压裂裂缝面密度、等效渗透率等参数进行表征.页岩油储层体积压裂开发过程中,流体的流动分为椭圆缝网内渗流区和主干缝内线性渗流区2个区域,建立二区耦合稳态渗流数学模型,推导页岩油体积压裂改造储层直井产能方程,模拟计算压裂井产能及分析压裂裂缝参数对产能的影响.结果表明:缝宽分形维数越大,裂缝面密度越大,基质—裂缝等效渗透率越大;当裂缝面密度较大时,增加储层改造宽度对产能提升有较大影响;次生缝导流能力越高,提高主干缝导流能力对产能影响越大,次生缝导流能力越小,影响越小.The seepage law of shale oil reservoir with micro/nano-scale pores through lab experiments.Based on dual fractal dimension of fractal theory,area density of fractures and equivalent permeability parameters were characterized.For volume fractured well,seepage field around the wellbore could be divided into two regions:nonlinear seepage region in elliptical fracture network region and linear seepage region in primary fracture.A mathematical model for two-region coupling steady flow was established based on conservation law of mass and motion equation,and productivity equation was presented.The analysis of calculation results illuminates that,the larger the fractal dimension of fracture width,the greater the area density of fractures,and the lager the equivalent permeability of matrix-fracture;the greater the tortuosity fractal dimension,the lower the equivalent permeability;increasing fracture network width could have a huge impact on the productivity improvement while the area density of fractures is large,and has small effect when the area density of fractures is small.With higher conductivity of secondary fractures,primary fracture conductivity has a larger impact on the production capacity.

关 键 词：页岩油 非线性渗流 体积压裂 分形 椭圆渗流 产能模型 

分 类 号：TE348[石油与天然气工程—油气田开发工程]