Experiment of dynamic seepage of tight/shale oil under matrix fracture coupling

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外文摘要：A physical simulation method with a combination of dynamic displacement and imbibition was established by integrating nuclear magnetic resonance(NMR)and CT scanning.The microscopic production mechanism of tight/shale oil in pore throat by dynamic imbibition and the influencing factors on the development effect of dynamic imbibition were analyzed.The dynamic seepage process of fracking-soaking-backflow-production integration was simulated,which reveals the dynamic production characteristics at different development stages and their contribution to enhancing oil recovery(EOR).The seepage of tight/shale reservoirs can be divided into three stages:strong displacement and weak imbibition as oil produced rapidly by displacement from macropores and fractures,weak displacement and strong imbibition as oil produced slowly by reverse imbibition from small pores,and weak displacement and weak imbibition at dynamic equilibrium.The greater displacement pressure results in the higher displacement recovery and the lower imbibition recovery.However,if the displacement pressure is too high,the injected water is easy to break through the front and reduce the recovery degree.The higher the permeability,the greater the imbibition and displacement recovery,the shorter the time of imbibition balance,and the higher the final recovery.The fractures can effectively increase the imbibition contact area between matrix and water,reduce the oil-water seepage resistance,promote the oil-water displacement between matrix and fracture,and improve the oil displacement rate and recovery of the matrix.The soaking after fracturing is beneficial to the imbibition replacement and energy storage of the fluid;also,the effective use of the carrying of the backflow fluid and the displacement in the mining stage is the key to enhancing oil recovery.

外文关键词：

tight oilshale oilphysical simulationnuclear magnetic resonanceCT scanningdynamic imbibitionproduction performanceEOR

作者：

DU Meng、YANG Zhengming、LYU Weifeng、LI Zhongcheng、WANG Guofeng、CHEN Xinliang、QI Xiang、YAO Lanlan、ZHANG Yuhao、JIA Ninghong、LI Haibo、CHANG Yilin、HUO Xu

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作者单位：

University of Chinese Academy of Sciences,Beijing 100049,China

Institute of Porous Flow & Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China

Research Institute of Petroleum Exploration & Development,PetroChina,Beijing 100083,China

Institute of Porous Flow&Fluid Mechanics,Chinese Academy of Sciences,Langfang 065007,China

Research Institute of Petroleum Exploration&Development,PetroChina,Beijing 100083,China

State Key Laboratory of Enhanced Oil Recovery,Beijing 100083,China

Exploration and Development Research Institute of PetroChina Jilin Oilfield,Songyuan 138000,China

PetroChina Qinghai Oilfield Company,Dunhuang 817500,China

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出版年：

2024

DOI：

10.1016/S1876-3804(24)60032-7

石油勘探与开发(英文)

中国石油天然气股份有限公司勘探开发研究院中国石油集团科学技术研究院

石油勘探与开发(英文)

ISSN：2096-4803

年,卷(期)：2024.51(2)