Critical properties and phase behavior of confined fluids in irregular nanopores of shale gas reservoir

被引:4
作者
Hao, Yongmao [1 ,2 ]
Fu, Jingang [1 ,2 ,3 ]
Su, Yuliang [1 ,2 ]
Wang, Wendong [1 ,2 ]
Li, Lei [1 ,2 ]
Chen, Zhangxin [3 ]
机构
[1] China Univ Petr East China, Key Lab Unconvent Oil & Gas Dev, Minist Educ, Qingdao 266580, Peoples R China
[2] China Univ Petr East China, Sch Petr Engn, Qingdao 266580, Peoples R China
[3] Univ Calgary, Chem & Petr Engn, Calgary, AB T2N 1N4, Canada
来源
GAS SCIENCE AND ENGINEERING | 2023年 / 116卷
基金
美国国家科学基金会;
关键词
Irregular nanopores; Confined fluids; Phase behavior; Equation of state; shale gas reservoir; CANONICAL MONTE-CARLO; PORE-SIZE; COMPETITIVE ADSORPTION; MULTILAYER ADSORPTION; CRITICAL-POINT; POROUS-MEDIA; TRANSPORT; STATE; CONDENSATION; PERMEABILITY;
D O I
10.1016/j.jgsce.2023.205002
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
Real pore size and shape can induce critical properties shifts and phase behavior alterations for confined fluids in nanopores and impact the gas storage and transport mechanisms in shale gas reservoirs. Therefore, accurate calculations of phase behavior parameters in irregular nanopores are of great significance for the efficient development of shale gas reservoirs. No publications so far have been found to study the critical properties shift of confined fluids in irregular nanopores. In this paper, first, a quantitative description method for calculating the adsorbed volume of a multicomponent confined fluid in irregular nanopores is proposed, coupled with scanning electron microscope (SEM) images of shale cores and a semi-empirical formula for adsorbed thickness. Second, an effective molar volume correction method is extended to non-circular pores. Meanwhile, a new parameter is introduced to modify a molar volume term. Third, a novel correlation is proposed to predict the critical properties shifts in irregular nanopores considering pore shape and mixed fluid composition. Finally, a modified PREOS (Peng-Robinson equation of state) model is proposed, solved, and validated. Moreover, the critical parameters of pure component fluids and phase behavior characteristics of mixed hydrocarbons under different pore sizes, pore shapes, and hydrocarbon components are investigated, which reveals that a real pore structure and mixed fluid composition in shale gas reservoirs can change phase behaviors of confined fluids in nanoscale pores.
引用
收藏
页数:14
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