不同水平段井眼轨迹下气液运移特征及指示意义  

Characteristics and Significance of Gas-Liquid Transport in Different Horizontal Sections of Borehole Trajectories

作　　者：赵彦伟 倪小明[1,2] 闫晋 郭盛强 ZHAO Yanwei;NI Xiaoming;YAN Jin;GUO Shengqiang(School of Energy Science and Engineering,H enan Polytechnic University,J iaozuo,H enan 454000;Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization,J iaozuo,H enan 454000;Shanxi Lanyan CBM(Group)C o.,L td.,J incheng,Shanxi 048204)

机构地区：[1]河南理工大学,能源科学与工程学院,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048204

出　　处：《地质与勘探》2025年第2期420-430,共11页Geology and Exploration

基　　金：山西省科技重大专项计划“揭榜挂帅”项目(编号:202101080301014);国家自然科学基金项目(编号:42372198)联合资助。

摘　　要：为查明不同形态水平段井眼轨迹下的气、液运移特征,以推动煤层气的高效开发,本次研究应用Fluent软件模拟不同水平段井眼轨迹下的气、液两相运移,得到四种水平段井眼轨迹(上倾形、下倾形、弓形、勺形)下的气、液运移特征,分析了四种井眼轨迹时水平段液体的滞留效应,提出了不同水平段井眼轨迹下气液高效产出的排采工艺。结果表明:不同气液流速比下,上倾形井眼轨迹内存在流态有气泡流、层流、环雾流;下倾形和弓形井眼轨迹内存在流态有气泡流、层流、段塞流、弥散流、环雾流;勺形井眼轨迹内存在流态有层流、段塞流、环雾流。上倾形、下倾形、弓形、勺形四种井眼轨迹液体滞留区间分别为670~700m、0~300m、0~180m、650~700m、0~320m;滞留区占比分别为4.28%、42.86%、32.86%、45.71%。环雾流时,通过气体携液作用能促进液体产出、降低液体的滞留效应。气液流速比为6.667时,能从段塞流过渡到环雾流。煤层气井的产气阶段,在实际排采过程中,通过调节套压和井底流压,快速提高煤层气井日产气量,能够实现气体和液体的高效产出。该研究成果可为不同水平段井眼轨迹下煤层气井产气阶段排采工作制度提供理论依据。This work attempts to identify the characteristics of gas and liquid transport under different horizontal borehole trajectories in order to promote the efficient production of coalbed methane(CBM).The software Fluent was applied to simulate the two-phase gas and liquid transport under different horizontal sections of borehole trajectories,and the gas-liquid transport features under four types of horizontal section borehole trajectories(upward inclined,downward inclined,bow shaped,and spoon shaped)were obtained.We also analyzed the retention effects of liquids in the horizontal section under the four types of borehole trajectories,and proposed the drainage and production technology for efficient gas and liquid production.The results show that under different gas-liquid flow rate ratios,there were flow states in the upward inclined wellbore trajectory,including bubble flow,laminar flow,and annular mist flow.These flow states such as bubble flow,laminar flow,slug flow,dispersed flow,and annular mist flow were observed in the downward inclined and bow shaped wellbore trajectories.There were laminar flow,slug flow,and annular mist flow in the trajectory of the spoon shaped wellbore.The liquid retention intervals for the four types of wellbore trajectories,namely upward inclined,downward inclined,bow shaped,and spoon shaped,were 670~700 m,0~300 m,0~180 m,650~700 m,and 0~320 m,respectively.The proportions of retention areas were 4.28%,42.86%,32.86%,and 45.71%,respectively.During annular mist flow,the gas carrying effect can promote liquid production and reduce the retention effect of liquid.When the gas-liquid flow rate ratio was 6.667,it can transition from slug flow to annular mist flow.During the gas production stage of coalbed methane wells,by adjusting the casing pressure and bottomhole flow pressure in the actual production process,the daily gas production of coalbed methane wells can be rapidly increased,which can achieve efficient production of gas and liquid.This research result can provide a theoretical basis

关 键 词：水平段井眼轨迹 气、液运移特征 液体的滞留效应 排采工艺 煤层气 

分 类 号：TE122.2[石油与天然气工程—油气勘探]