煤层气井排煤粉环空射流泵的数值模拟  

Numerical Simulation of Annular Jet Pump for Pulverized Coal Discharge in CBM Well

作　　者：刘冰[1] 魏文强 唐勇 黄永超 杜继芸 綦耀光[1] 张芬娜[1] 

机构地区：[1]中国石油大学(华东)机电工程学院 [2]中石化天津液化天然气有限责任公司 [3]河南中原总机泵业有限公司

出　　处：《石油机械》2014年第3期80-83,共4页China Petroleum Machinery

基　　金：国家科技重大专项"煤层气井排采设备优化及先进修井技术"(2011ZX05038-002);国家自然科学基金项目"煤层气排采井下泵的设计技术与理论研究"(51174224);中央高校基本科研业务费专项资金项目"煤层气井煤粉颗粒排出工艺技术的研究"(13CX06078A)

摘　　要：基于液固两相流的基本理论和κ-ε两方程湍流模型,利用Fluent软件对煤层气井新型排煤粉环空射流泵的湍射流场进行数值模拟。模拟结果表明,煤粉运动轨迹表明环空射流泵有利于煤粉颗粒的吸入和排出;环空射流泵在吸入液(地层液)流量小于15 m3/d时,通过补充动力液产生负压,使地层液和煤粉颗粒吸入泵内进而排出地面;当吸入液含煤粉体积分数相同时,粒径越大的煤粉颗粒在喉管内的分布越靠近中心线。通过对多相流条件下喉管出口断面流速分布的分析,得出了喉管最优长径比为4。该项研究结果为环空射流泵的优化设计提供了依据。On the basis of the basic theory of liquid-solid two-phase flow and the Kc two-equation turbulence model, the Fluent software was used to conduct a numerieal simulation of the turbulence jet field of the new annular jet pump for pulverized coal discharge in coalbed methane （CBM） wells. An analysis of its properties of coal pow- der discharge was carried out. The analysis shows that the pulverized coal motion trajectory indicates that the pump is favorable to the inhalation and discharge of coal powder particles. When the inhalation liquid flowrate （ formation ） of the pump is less than 15 m3/d, the formation liquid and coal powder particles are inhaled into the pump and then discharged onto the ground by supplementing power liquid to produce negative pressure. When the inhaled liq- uid contains the same coal powder volume fraction, the greater the coal powder size, the nearer to the center line the distribution of the particles in venturi tube. An analysis of the flowrate distribution on venturi outlet profile in the multiphase condition indicates that the optimum length-diameter ratio of venturi is 4. The research findings call pro- vide the basis for the design optimization of annular jet pump.

关 键 词：煤层气井 排煤粉 环空射流泵 内部流场 数值模拟 FLUENT 

分 类 号：TE933[石油与天然气工程—石油机械设备]