基于孔隙网络模型的页岩油水两相流动模拟

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Guoqing Zhang, Zhijun Zhou, Chunxue Cui, Jian Zhang, Jingyi Wang
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引用次数: 0

摘要

随着页岩油在油气资源领域的重要性日益提高,页岩储层油水两相流动特性的不确定性对页岩油有效开采的影响日益受到人们的关注。利用FIB-SEM对页岩样品进行扫描,可以建立真实的孔隙网络结构,并通过二维切片的实现对页岩储层孔隙类型、孔喉大小和连通性进行分析。随后,利用基于网格连通的孔隙网络模型进行油水两相流模拟,结合L-S和N-S数学模型,定量考察驱替压力与润湿性、采收率与剩余油之间的相关性,以及喉道尺寸对压力损失的影响。研究结果表明,页岩储层发育5种独特的孔隙类型,即粒间孔、溶蚀孔、晶间孔、晶内孔和微裂缝。在连通性较差的页岩储层中,会生成大量纳米级孔隙,其渗流能力主要受孔喉大小和连通性的影响。喉部尺寸越小,位移压力越大,喉部通过后的压降也越大。为了防止指动和压降过大,必须保持对位移压力的合理控制。当壁面处于水湿状态时,驱替效率最佳。因此,提高表面润湿性有利于微观孔喉剩余油的有效开采。研究结果为页岩油资源的高效开发提供了有价值的理论见解。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Shale Oil-water Two-phase Flow Simulation based on Pore Network Modeling
Abstract With the growing significance of shale oil in the realm of oil and gas resources, there has been a heightened focus on the impact of the indeterminate oil-water two-phase flow behaviour in shale reservoirs on the effective exploitation of shale oil. The utilization of FIB-SEM scanning on shale samples enables the establishment of the real pore network structure and facilitates the analysis of pore type, pore throat size and connectivity of shale reservoirs through the implementation of two-dimensional slices. Subsequently, the gridded connectivity-based pore network model is utilized to conduct oil-water two-phase flow simulation, wherein the L-S and N-S mathematical models are incorporated to quantitatively examine the correlation between the displacement pressure and wettability and the recovery degree and remaining oil, as well as the impact of throat size on pressure loss. The research findings indicate the emergence of five distinctive pore types in shale reservoirs, namely intergranular pores, dissolution pores, intercrystalline pores, intracrystalline pores, and micro-fractures. In shale reservoirs with poor connectivity, a significant quantity of nanometer-scale pores are generated, wherein the seepage capacity is primarily influenced by the size and connectivity of pore throats. The smaller the throat size is, the greater the displacement pressure will be and the greater the pressure drop will be after the throat is passed through. To prevent fingering and excessive pressure drop, it is necessary to maintain reasonable control over the displacement pressure. The displacement efficiency is optimal when the wall surface is in a water-wet state. Therefore, enhancing the wettability of the surface can facilitate the efficient recovery of the remaining oil in the microscopic pore throats. The research findings offer valuable theoretical insights for the efficient exploitation of shale oil resources.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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