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基于微流控模型的致密油藏微观渗吸机制试验
石立华1,2,魏登峰1,常毓文3,党海龙1,2,董涛1,师调调1,王菲菲1
(1.陕西延长石油(集团)有限责任公司研究院,陕西西安710065;2.陕西省特低渗透油气勘探开发工程技术研究中心,陕西西安 710065;3.中国石油勘探开发研究院,北京 100083)
摘要:
针对目前岩心渗吸周期长、计量不准确且现有微观模型参数设计未涉及到致密储层典型喉道尺寸等问题,设计考虑不同喉道尺寸、孔隙形状、孔喉比、喉道与孔隙连接位置、配位数玻璃制成的喉道和孔隙双深度及硅-玻璃制成的均深刻蚀微流控模型,并通过高温氧化硅镀层实现流道内部润湿性一致,开展蒸馏水-油、油-异丙醇-蒸馏水型体系的一系列渗吸试验。结果表明:喉道中存在薄膜流动,且薄膜流动速度远快于渗吸弯液面移动速度, 不规则渗吸界面是由喉道内表面粗糙度引起的,薄膜流动对孔喉渗吸效果影响显著;渗吸早期,宽喉道对于渗吸作用的贡献远大于窄喉道,润湿性增加有利于润湿相向扩径区域渗吸;薄膜流动避免了润湿相在喉道中的卡断现象,而是以间断薄膜流动形式继续向出口流动;较小的润湿角和迂曲度有利于渗吸作用,渗吸的距离更远,渗吸前缘更为均匀,配位数、孔隙形状及大小对渗吸影响较小,主要受孔隙与喉道接触位置的开口大小决定,润湿性决定渗吸在各种孔喉结构下的整体效果。
关键词:  致密油藏  渗吸机制  微流控模型  润湿相体系
DOI:10.3969/j.issn.1673-5005.2024.02.011
分类号::TE 348
文献标识码:A
基金项目:陕西省自然科学基础研究计划(2023-JC-YB-423,2022JQ-290)
Experiment on micro imbibition mechanisms of tight reservoirs based on a microfluidic model
SHI Lihua1,2, WEI Dengfeng1, CHANG Yuwen3, DANG Hailong1,2, DONG Tao1, SHI Tiaotiao1, WANG Feifei1
(1.Research Institute of Shaanxi Yanchang Petroleum (Group) Company Limited, Xi 'an 710065, China;2.Shaanxi Research Center for Exploration and Development Engineering Technology of Extra Low Permeability Oil and Gas, Xi 'an 710065, China;3.Research Institute of Petroleum Exploration & Development, CNPC, Beijing 100083, China)
Abstract:
Aiming at the problems of long core imbibition duration, inaccurate measurement and the existing microscopic model not involving the typical throat size of tight reservoirs, in this study, a novel microfluidic model made of corroded silicon-glass to simulate the pore structures in tight reservoirs was designed, in which different throat size, pore shape, pore throat ratio, throat and pore connection position can be considered. The consistency of internal wettability of the pores and channels was achieved through high-temperature silicon oxide coating. A series of imbibition experiments using distilled water-oil and oil-isopropanol-distilled water were carried out. The results show that there is a film flow inside the throat, and its velocity is much faster than that of the moving suction meniscus. The irregular suction interface can be caused by the roughness of the inner surface of the throat, and the film flow has a significant impact on the pore throat infiltration effect. At the early stage of imbibition, the contribution of wide throats to imbibition is far greater than that of narrow throats, and the increase of wettability is conducive to the imbibition of the wetting phase towards the expanding area. The film flow can avoid blocking of the wetting phase in the throats, but it continues to flow towards the outlet in the form of discontinuous film flow. Smaller wetting angle and tortuosity are conducive to imbibition. The longer of the imbibition distance, the more uniform of the leading edge of imbibition, and the coordination number, pore shape and size have less influence on imbibition. The imbibition is mainly determined by the size of the opening at the contact position between pores and throats, and the wettability determines the overall effect of imbibition in various pore throat structures.
Key words:  tight reservoir  imbibition mechanism  microfluidic model  wetting phase system
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