深部煤层气水平井井筒气液两相流数值模拟  

Numerical Simulation of Gas-Liquid Two-phase Flow in Deep Coalbed Methane Horizontal Wellbore

作　　者：庞斌 李兆明 吴建军 徐思渊 陈伟雄[4] PANG Bin;LI Zhaoming;WU Jianjun;XU Siyuan;CHEN Weixiong(PetroChina Coalbed Methane Co.,Ltd.,Beijing 100020,China;China United National Engineering Research Center for Coalbed Methane Co.,Ltd.,Beijing 100951,China;Research Institute of Engineering Technology,PetroChina Coalbed Methane Co.,Ltd.,Xi'an 710082,China;State Key Laboratory of Multiphase Flow in Power Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]中石油煤层气有限责任公司,北京100020 [2]中联煤层气国家工程研究中心有限责任公司,北京100951 [3]中石油煤层气有限责任公司工程技术研究院,西安710082 [4]西安交通大学动力工程多相流国家重点实验室,西安710049

出　　处：《煤炭技术》2024年第10期48-52,共5页Coal Technology

基　　金：中国石油天然气股份有限公司攻关性应用性科技项目(2023ZZ18);中石油煤层气有限责任公司科技项目(2023-KJ-08)。

摘　　要：深部煤层气井地层压力高,气液比变化范围大,不同于常规研究中的常压气液两相流,属于中高压的气液两相流流动。通过数值模拟的方法,研究深部煤层气井在高压力范围内、不同气液比下的气液两相流的流型变化、压降流动特性。结果表明:深部煤层气水平井在气液比低或压力高时,主要以弹状流和过渡流为主;气液比高或压力低时主要以环状流为主。深部煤层气实际生产工况中井筒内流体流型主要可划分为弹状流、过渡流、环状流3种区域;压降随着压力升高逐渐增大,相同日产气量的情况下,压降随着日产液量增大而增大,并且压降随压力变化更加剧烈;气液比高时,1 500 m井深以上主要以环状流为主;气液比低时,1 000 m井深以下主要以过渡流为主。The high-pressure gas-liquid two-phase flow in deep coalbed methane wells is different from the atmospheric pressure gas-liquid two-phase flow in conventional studies.The numerical simulation method was used to investigate the flow pattern change and pressure drop flow characteristics of the gas-liquid two-phase flow in coalbed methane wells in the high pressure range,under the daily gas production and liquid production,by using numerical simulation.The results show that the two-phase flow in CBM wells is mainly dominated by elastic flow and transition flow at high gas-liquid ratio and high pressure,and mainly dominated by annular flow at low gas-liquid ratio and low pressure,which can be mainly divided into three flow regions of elastic flow,transition flow,and annular flow in the actual production conditions of CBM;the pressure drop gradually increases with the pressure rise,and the pressure drop increases with the increase of daily liquid production for the same daily gas production,and the pressure drop varies more drastically with the pressure change,and the pressure drop is more drastic with the pressure change.The pressure drop is more drastic with the pressure change;when the gas-liquid ratio is high,the annular flow is mainly dominated above 1500 m well depth;when the gas-liquid ratio is low,the transition flow is mainly dominated below 1000 m well depth.

关 键 词：气液两相流 流型 气液比 压降 

分 类 号：O353.5[理学—流体力学]