气液两相段塞流在裂隙中流动规律实验  

Experimental Study on Flow Pattern of Two-phase Slug(Gas and Liquid)in Fractures

作　　者：倪小明[1,2] 赵彦伟 郭盛强 何庆宏 闫晋 宋金星 Ni Xiaoming;Zhao Yanwei;Guo Shengqiang;He Qinghong;Yan Jin;Song Jinxing(Henan Polytechnic University,Jiaozuo,Henan 454000,China;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,Jiaozuo,Henan 454000,China;Shanxi Blue Flame Coalbed Methane Group Co.,Ltd.,Jincheng,Shanxi 048200,China)

机构地区：[1]河南理工大学,河南焦作454000 [2]煤炭安全生产与清洁高效利用省部共建协同创新中心,河南焦作454000 [3]山西蓝焰煤层气集团有限责任公司,山西晋城048200

出　　处：《特种油气藏》2024年第3期98-105,共8页Special Oil & Gas Reservoirs

基　　金：国家自然科学基金“难采稠油多元热复合高效开发机理与关键技术基础研究”(U20B6003);国家自然基金项目“不同煤体结构组合水力压裂裂缝扩展演化特征与起裂选择联动效应”(42072189);山西省科技重大专项计划“揭榜挂帅”项目“深部煤层气多煤层水平井共采技术研究”(202101080301014)。

摘　　要：针对储层裂隙中段塞流流动规律认识不清、控制因素不明确的问题,利用气液两相运移产出微观流动模拟实验装置,研究了段塞流在裂隙中的流动规律,分析了裂隙直径、气液两相流量等对段塞流流动关键参数的影响及流量波动特征。研究表明:气液两相段塞流在裂隙中呈现周期性特征,从形成到消失可分为气塞形成、气塞扩大、气塞主导3个阶段;裂隙直径与段塞频率呈线性负相关,与气液相流量波动幅度呈线性正相关;当液相流量为15.00、20.00、25.00、30.00 cm^(3)/min时,随着气相流量的增加,段塞频率的变化速率分别为0.130、0.012、0.009、0.007,持液率变化速率分别为1.503、1.175、0.918、0.820。该研究结果对煤层气开发过程中段塞流机理研究具有指导意义。To address the lack of consensus on the slug flow pattern and control factors in the middle section of reservoir fractures,the flow pattern of slug in fracture is studied,the influence and fluctuation characteristics of key parameters of slug flow are analyzed,such as fracture diameter and gas-liquid phase flow rate.The results indicate that the two-phase slug flow presents periodic characteristics in the fracture by using micro-scale flow simulation experimental device of two phase(gas and liquid)migration and production,.From formation to disappearance,the gas slug can be divided into three stages:formation,expansion and dominance.The fracture diameter is linearly negatively correlated with the slug frequency and linearly positively correlated with the fluctuation range of gas and liquid phase flow.As the liquid flow rate was set at 15.00,20.00,25.00 and 30.00 cm^(3)/min,the variance ratio of slug frequency decreased with increasing gas flow rate,being 0.130,0.012,0.009 and 0.007,respectively.Similarly,the variance ratio of liquid holdup decreased with increasing gas flow rate,being 1.503,1.175,0.918 and 0.820,respectively.The findings have guiding significance for the study of slug flow mechanism in the process of coalbed methane development.

关 键 词：气液两相流 周期性 段塞流 持液率 裂隙直径 

分 类 号：TE132.2[石油与天然气工程—油气勘探]