摘要
为解决天然气井井下气相夹液及超高气液比气液分离器分离效率低等问题,设计了一种适用于高气液比井下的气液分离装置。通过数值模拟研究及正交试验法确定了分离器较优结构模型,并分析了不同进口速度、气液比以及分流比对其分离效率的影响。研究结果表明:影响分离器分离效率因素的主次程度依次为聚集挡板角度>聚集挡板间距>聚集挡板数,在27 m^(3)/d的流量下,75.9 mm内径的井下气液分离装置的最优结构为聚集挡板数18个,聚集挡板间距40 mm,聚集挡板角度45°,且当气液比为7∶1、装置进口速度为15 m/s、分流比为7∶1时,分离效率达93.6%;将装置第一级设置为聚结螺旋轴入式旋流分离可使气液分离效率得以提升。所得结论可为天然气井井下气液分离器的设计提供技术参考。
Considering the low efficiency of downhole gas-liquid separator in gas wells with fluid in gas phase and ultrahigh gas-liquid ratio,a downhole gas-liquid separator suitable for wells with high gas-liquid ratio was designed.Then,the numerical simulation and orthogonal test were used to determine the optimal structural model of the separator,and analyze the influences of inlet speeds,gas-liquid ratios and diversion ratios on the separation efficiency.The results show that the factors are ranked as accumulation baffle angle>accumulation baffle spacing>accumulation baffle number in an order of impact on the separation efficiency.At a flow rate of 27 m^(3)/d,the optimal structure of the 75.9 mm ID downhole gas-liquid separator is designed with:18 accumulation baffles,40 mm accumulation baffle spacing,and 45°accumulation baffle angle.When the gas-liquid ratio is 7∶1,the inlet speed of the separator is 15 m/s,and the diversion ratio is 7∶1,the separation efficiency reaches 93.6%.When the first stage of the separator is set as a coalescing spiral axial cyclone separation,the gas-liquid separation efficiency is improved.The conclusions provide reference for the design of downhole gas-liquid separator in gas wells.
作者
王贺
张勇
张新成
Wang He;Zhang Yong;Zhang Xincheng(School of Mechanical Science and Engineering,Northeast Petroleum University;Heilongjiang Key Laboratory of Petroleum and Petrochemical Multi-phase Media Treatment and Pollution Prevention;Zhejiang Provincial Engineering Research Center of High-Performance Industrial Pump and Vacuum Equipment,Taizhou University;Daqing Oilfield Water and Environmental Protection Company)
出处
《石油机械》
北大核心
2024年第11期99-106,共8页
China Petroleum Machinery
基金
国家自然科学基金区域创新发展联合基金重点支持项目“同井注采井筒内关键湍流场域离散相运聚机理及运移动力学行为研究”(U21A20104)
863计划项目“井下油水分离及同井注采技术与装备”(2012AA061303)
台州市科技计划项目“基于两相体积三维精准重构的气液混合在线智能流量计关键技术研究”(23gyb10)。
关键词
天然气井
气液分离器
高速聚结
仿真分析
正交试验
操作参数
gas well
gas-liquid separator
high speed coalescence
simulation
orthogonal test
operating parameter
