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微-纳尺度孔隙不同类型流体的赋存状态数学模型
东晓虎1,陈掌星1,2,刘慧卿1,刘一杉1,罗岐岚1,吴克柳1,赵斌1,郑轶丹3
(1. 中国石油大学(北京)油气资源与探测国家重点实验室,北京 102249;2.加拿大卡尔加里大学化学与石油工程系,卡尔加里 T2N1N4;3.中国石油天然气集团有限公司集团办公室,北京 100027)
摘要:
通过考虑微-纳尺度孔隙内流体分子与孔壁间的相互作用势能,引入简化的局部密度函数理论,建立微-纳尺度孔隙不同类型流体的赋存状态数学模型。同时,该模型也考虑微-纳尺度孔隙内流体临界参数随孔隙尺度的变化特征。基于该数学模型,分别对单组分、双组分及三组分流体的赋存状态进行模拟,评价孔隙直径、组分含量及流体组成等对流体赋存特征的影响。结果表明:在微-纳尺度孔隙内流体以吸附相和体相两种形式存在,孔壁处吸附相流体的密度高于孔隙中部的体相流体密度;多组分流体在孔隙内的吸附(液膜)层厚度,大于其中单一轻质组分流体所形成的吸附层厚度,小于单一重质组分流体形成的吸附层厚度;随着孔隙直径及流体碳数的增大,吸附层厚度增大,但增加幅度减小,孔隙直径与吸附层厚度呈近似指数关系。
关键词:  微-纳米孔  页岩  作用势能  赋存状态  吸附
DOI:10.3969/j.issn.1673-5005.2021.02.010
分类号::TE 122.3
文献标识码:A
基金项目:
Mathematical modeling for occurrence state of hydrocarbon sin micro/nano-scale pores
DONG Xiaohu1, CHEN Zhangxing1,2, LIU Huiqing1, LIU Yishan1, LUO Qilan1, WU Keliu1, ZHAO Bin1, ZHENG Yidan3
(1.State Key Laboratory of Petroleum Resources and Prospecting in China University of Petroleum(Beijing), Beijing 102249, China;2.Department of Chemical and Petroleum Engineering, University of Calgary, Calgary T2N1N4, Canada;3.General Duty Office, China National Petroleum Corporation, Beijing 100027, China)
Abstract:
A mathematical model for the occurrence state of hydrocarbons in micro/nano-scale pores was derived, in which a simplified local density function was introduced considering the interaction between hydrocarbon molecules and pore surface walls. Simultaneously, the behavior of critical shift of fluids in micro/nano-pores was also considered. The occurrence states of hydrocarbon fluid with single component, two components and three components were simulated respectively using the model. The effects of pore size, component fraction and fluid composition were investigated. The simulation results indicate that, due to the effect of pore proximity, the fluids in micro/nano-pores will exist in two states:bulk phase and adsorbed phase. The density of the adsorbed phase around the pore wall is higher than that of the bulk phase in the center of the pore. For hydrocarbon fluid with multi-components, it is found that the thickness of its adsorption film is greater than that of the single light component, but less than that of the single heavy component. As the pore size increases, the thickness of the adsorption film is increased, which appears in an exponential relationship. Furthermore, as the average carbon number of the hydrocarbon fluid increases, the interaction energy between fluid and pore walls is increased, thus the thickness of the adsorption film is increased.
Key words:  micro/nano-pores  shale  interaction potential energy  occurrence state  adsorption behavior
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