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页岩油藏表观液体渗透率的分形表征方法
杨元亮
0
(中国石化新疆新春石油开发有限责任公司,山东东营257000)
摘要:
表观液体渗透率是研究页岩油藏有效渗流能力的重要参数,明确负滑移长度对表观液体渗透率的影响对认识页岩油藏渗流能力具有重要意义。在多孔介质分形理论的基础上,建立页岩油藏表观液体渗透率模型。新建立的页岩油藏表观液体渗透率模型可综合反映储层孔隙结构、孔隙度、迂曲度和孔隙半径及负滑移长度的影响。理论分析结果表明:负滑移长度越大,流体在微纳米管中的平均渗流速度越小;孔隙半径越大,负滑移长度对渗流速度的影响越小。表观液体渗透率与达西渗透率之比随负滑移长度的增加而减小;表观液体渗透率随孔隙分形维数的增加而增大,随迂曲度的增大而减小。表观液体渗透率模型的预测结果表明,滑移效应引起的渗透率损失为8.6%。
关键词:  页岩油藏  表观液体渗透率  分形理论  多孔介质  负滑移长度
DOI:10.13673/j.cnki.cn37-1359/te.2020.06.013
基金项目:国家科技重大专项“渤海湾盆地济阳坳陷致密油开发示范工程”(2017ZX05072),中国石化科技攻关项目“济阳坳陷页岩油可动性主控因素与甜点评价”(P19017-6)。
Fractal characterization of apparent liquid permeability in shale reservoirs
YANG Yuanliang
(Xinjiang Xinchun Oil Development Co.,Ltd.,SINOPEC,Dongying City,Shandong Province,257000,China)
Abstract:
The apparent liquid permeability is of vital importance to studying the effective percolation capacity of shale reservoirs,and it is essential to explore the influence of negative slip length on apparent liquid permeability. Based on the fractal theory of porous media,the model of apparent liquid permeability was established,which comprehensively reflects the influence of pore structure,porosity,tortuosity,pore radius,and negative liquid slip length on apparent liquid permeability.According to the theoretical analysis,greater negative slip length leads to lower average percolation velocity of the liquid in micro/nanotubes;a larger pore radius results in less influence of negative slip length on percolation velocity. The ratio of apparent liquid permeability to Darcy permeability falls with the rise in negative slip length. The apparent liquid permeability goes up with the increase in fractal dimension of pores and down with the growth of tortuosity. The prediction results depending on the apparent liquid permeability model signals an 8.6% reduction in permeability caused by the slip effect.
Key words:  shale reservoir  apparent liquid permeability  fractal theory  porous media  negative slip length

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