南海西部高气液比油井电泵举升系统设计与应用

南海西部部分油田地饱压差小、溶解气油比高,开发后期生产压差大、原油脱气严重,井下电泵机组常出现气蚀、气锁等情况,导致无产出或躺井.为提高高气液比油井的检泵周期,降低故障率,调研了业内先进的电泵举升气体处理技术,分析了各个模块的气体处理能力,形成了基于吸入口气体体积含量和产液量的电泵举升系统优选图版.阐述了高气油比油井塔...

DESIGN AND APPLICATION OF ESP LIFTING SYSTEM FOR OIL WELLS WITH HIGH GASLIQUID RATIO OF WESTERN SOUTH CHINA SEA

The oilfields of Western South China Sea have low saturation pressure difference,high dissolved gas-oil ratio and large production pressure difference in the later stage of development and serious degassing of crude oil.Cavitation erosion and gas lock often occur in downhole electric submersible pump units,resulting in no output or well-lying.In order to improve the pump inspection period and reduce the failure rate of oil wells with high gas-liquid ratio,the advanced gas treatment tech?nology of electric pump lifting in the industry was investigated.The gas processing capacity of each module was analyzed.Based on the volume content of inlet gas and liquid production,the optimal diagram of ESP lifting system is formed.The sub?section design principle and method of tower type combined pump with high gas-oil ratio oil well was described.More than 20 wells have been used.And various combinations of tower gas treatment pump,tower gas treatment pump+wide width pump,tower gas treatment pump+common pump have been tried.And the application results were all good.No gas lock occurred during production.The highest stable liquid production is 360m³/d.The highest gas-liquid ratio is 480³/m³.The longest stable production has reached 1221 days.