基于微焦点CT技术的孔隙尺度多相渗流实验系统开发  

Development of Pore-scale Multiphase Flow Experiment System in Porous Media Based on Micro-CT Imaging Technique

作　　者：吕鹏飞 赵文杰[1] 刘锋 LU Pengfei;ZHAO Wenjie;LIU Feng(School of Energy and Power Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学能源与动力工程学院,太原030051

出　　处：《实验室研究与探索》2022年第6期11-15,共5页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(52106213);山西省高等学校创新计划项目(2020L0288,2020L0321)。

摘　　要：针对常规实验手段无法深入探究多孔介质内微观渗流机理问题,开发了一套基于微焦点CT成像技术的多相渗流实验系统。该实验系统主要由CT主机、模拟驱替环节、温度控制环节及数据采集环节等组成。整个实验过程主要包括CT主机预热、扫描参数确定、CT校正、检漏与真空处理、注液实验与CT扫描和CT图像处理等步骤。在实验平台上进行了CO_(2)^(-)盐水两相流动可视化研究,探讨了岩心内部孔隙结构与骨架分布特征、气-液界面演变规律和孔隙尺度多孔介质润湿机理。实验系统实现了孔隙尺度至岩心尺度多孔介质内多相多组分渗流过程监测。Because traditional methods can hardly dig into the essential pore-scale flow mechanisms of porous media.An experiment system focusing on multiphase flow mechanisms in porous media was designed based on micro-CT imaging technique.The system includes an X-ray CT machine,a fluid displacing system,temperature and pressure control systems,and a data acquisition system.The whole experiment processes mainly include CT prewarming,scanning parameter determination,CT calibration,leak test and vacuuming,displacement experiments and scanning,and imaging processing.A detailed introduction was given through CO_(2)^(-)brine two phase flow experiments.The pore structure and skeleton of the rock cores was clearly obtained.The evolution characteristic of gas-liquid interface and the wetting mechanism of porous surfaces were founded.This experimental system was successfullyimplemented into pore to core scale multiphase and multicomponent seepage process observation.

关 键 词：多孔介质 孔隙尺度 CT成像 多相渗流 

分 类 号：O35[理学—流体力学]