Experimental investigation of thermodynamic and kinetic behaviors from water vapor adsorption on four typical clay minerals

被引:9
作者
Xiong, Shuling [1 ]
Chen, Manfei [2 ,3 ]
Yu, Hui [1 ]
Zhang, Weihang [1 ]
Hu, Qinhong [4 ]
He, Sheng [1 ]
Yang, Rui [1 ]
机构
[1] China Univ Geosci, Key Lab Tecton & Petr Resources, Minist Educ, Wuhan 430074, Peoples R China
[2] PetroChina Southwest Oil & Gas Field Co, Explorat & Dev Res Inst, Chengdu 610041, Sichuan, Peoples R China
[3] Shale Gas Evaluat & Exploitat Key Lab Sichuan Prov, Chengdu 610041, Sichuan, Peoples R China
[4] Univ Texas Arlington, Dept Earth & Environm Sci, Arlington, TX 76019 USA
来源
GAS SCIENCE AND ENGINEERING | 2023年 / 111卷
基金
中国国家自然科学基金;
关键词
Clay minerals; Water vapor adsorption; Water distribution; Mathematical modeling; Kinetic model; PORE STRUCTURE-ANALYSIS; CAPILLARY CONDENSATION; METHANE ADSORPTION; ISOTHERM MODELS; SURFACE-AREA; POROUS-MEDIA; SHALE GAS; SORPTION; CAPACITY; MONTMORILLONITE;
D O I
10.1016/j.jgsce.2023.204933
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
Clay minerals within the shale reservoirs mainly exist in the water-bearing state in situ. The water adsorption behavior and behind mechanisms on the clay minerals are essential for the evaluation of shale gas reservoirs. In this work, combined experiments of water vapor adsorption (WVA) and nitrogen (N2) adsorption were conducted on four typical clay minerals, including montmorillonite (Mnt), illite (Ilt), chlorite (Chl), and kaolinite (Kln). Our results show that the various pore size distributions derived from the WVA and N2 adsorption data indicate that pores with a diameter smaller than 10 nm contribute 54%-82% to the total amount of water uptake. Fitting parameters obtained from five mathematical models, including the Guggenheim-Anderson-de Boer (GAB), Dent, Oswin, Freundlich, and Frenkel-Halsey-Hill (FHH), can illustrate physicochemical characteristics behind the WVA isotherm data. Compared to other models, the FHH model is more optimal to fit and predict the WVA isotherms on the four typical clay minerals. In addition, three kinetic models were utilized to evaluate the WVA kinetic behavior for the four typical clay minerals, including Pseudo-first-order (PFO), Pseudo-second-order (PSO), and Double-exponential (DE) model. Water adsorption process in the clay minerals is a two-stage pro-cess and is mainly controlled by the slow pore-diffusion process, as indicated by the best fitting results from DE model. Finally, the differences of the fitting parameters in the GAB model (the most versatile model on WVA experiments for shale rocks) and adsorption kinetics between clay minerals and shale in the WVA process were discussed, which can provide guidance for investigates of moisture distribution in the shale. Overall, the findings of this work are of great significance to determine the water distribution in the shale reservoirs and shale gas content evaluation in the actual moisture condition.
引用
收藏
页数:17
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