摘要
为了提高气井涡流排液采气工具的工作效率,进行了涡流工具结构优化研究。运用Auto CAD和Fluent流体模拟软件,建立了涡流工具气液两相流场模型,运用正交试验确定了模拟计算方案,通过方差和极差分析得到了不同气液条件下导程、导程数、槽深和槽宽等4个结构参数对工具出口峰值速度的影响程度并确定了工具最优结构参数。结果表明,较小的槽深和槽宽、较大的导程和导程数可以起到很好的增速效果。槽深取5 mm,槽宽取40-45 mm,导程数取3倍,导程取172-219 mm时,气液混合物经过涡流工具后气相峰值速度最大,携液效果最好。工具结构参数对工具出口峰值速度的影响程度随气液条件而变化,液气比较大时,选择较大的导程数具有更明显的增速效果;入口速度较大时,较小的槽宽具有更明显的增速效果,而较大的导程增速效果并不明显;较小的槽深始终具有明显的增速效果。研究结果可以为现场涡流工具的优选和使用效果的提高提供依据。
A study was made on structural optimization of swirl tool to enhance operation effciency of the swirl fuid-discharging and gas-producing tool in gas wells. AutoCAD and Fluent fuid simulation software were used in the study to build a fow feld model for gas/liquid in swirl tool. In addition, orthogonal test was performed to clarify the program for simulation and calculation. Through variance and range analysis, impacts of four structural parameters （i.e. lead, number of leads, trough depth and trough width） on peak ve-locity at outlet of the tool were determined together with optimal structural parameters for such tool. The results show that minor trough depth and width, together with large lead and number of leads can effectively enhance velocities. With trough depth of 5 mm, trough width of 40-45 mm, lead number of 3 and leads of 172-219 mm, the maximum velocity of gas from gas/liquid mixture through swirl tool with the most desirable fuid-carrying capacity can be obtained. Impacts of structural parameters of such tool on the maximum outlet velocity may vary with conditions of gas/liquid. With relatively high liquid/gas ratio, higher number of leads may effectively enhance the velocity. With relatively high velocity at inlet, smaller trough width may obviously increase the velocity. Besides, larger leads may have insignifcant impacts on increase in velocity. Smaller trough depth may constantly display obvious impacts on enhancement of velocity. The study results may provide necessary references for selecting optimal swirl tools and promoting performances of such tools on site.
出处
《石油钻采工艺》
CAS
CSCD
北大核心
2016年第3期400-404,共5页
Oil Drilling & Production Technology
基金
中海油能源发展股份有限公司科研项目"涡流工具携液影响因素分析"(编号:GC2014ZC2916)
关键词
气井
排采技术
涡流工具
结构参数优化
液气比
数值模拟
正交试验
敏感性分析
gas well
discharging and production technique
swirl tool
optimization of structural parameter
liquid/gas ratio
numerical simulation
orthogonal test
sensitivity analysis
