井底复合式抽吸气举工具结构设计及性能优化

打开文本图片集

关键词：低压气井；排水采气；气举；抽吸工具；文丘里效应；旋流引射；注气速率中图分类号：TE377文献标识码：ADOI：10.12473/CPM.202502004

Structural Design and Performance Optimization of Bottomhole Suction and GasLift Tool

Zhao Xiaolong （Hancheng Branch of PetroChina Coalbed MethaneCo.，Ltd.）

Abstract：Gas wells usually suffer the problems of low pressure，low production，and botomhole liquid loadingin thelatestageof exploitation.Adownholeswirling ejection，suctionand gas lifttoolwas designedusing the Venturieffect.Withtheejectionratioasanindicator，theinternalflowfieldofthetoolwithdiferentnozzlesand diffusionsection channels was numericalysimulated.The tool'sdrainageperformance was analyzed，andits structure wasoptimized.The influences of differentthroat-to-nozzlearearatiosand difusionanglesonthetool performance and the influences of gas injectionrateon theperformanceof toolwith varying nozle width were analyzed. Field test wasconductedontheoptimized tool.Theresults indicatethat theaxialorradialdifusionangle inthediffusionsection can inducereflux，whilean excessive divergent angleon thewallat the intersectionof nozzleand ejectionchannelscan lead to vortex.The tool's ejectionratio increasedand then decreased with the increaseof throat-to-nozzlearearatioordiffusionangle.Thetoolachievedthemoststableinternalflow field，withtheoptimal ejection ratio，when the throat-to-nozzle area ratio was 2 and the diffusion angle was 4∘ ．Similarly，the ejection ratioandejection gasrate increasedandthendecreasedas thegas injectionrate increased，and there isanoptimal gas injection interval.As thenozze width increased，the maximum ejection gasrate that the tool can achieve increased，while therequired injection gasrate increased significantly.This phenomenon should beconsidered in practical applications.Comparison shows thatthe tool performs beter，with satisfactory stabilityand reliability， when the nozzle width is 0.5mm ，and it facilitates a stable resumption of well production once the gas injection parametersare optimized.The research provides a technical support for eficient drainage gas recovery in lowpressure，low-yield and high-water-producing wells.

Keywords：low-pressure gas well；drainage gas recovery；gas lift；suction tool；Venturi effect；swirling ejec tion；gas injection rate

0 前言

我国目前已探明天然气储量为12.4万亿 m3 气藏类型多样，勘探开发潜力大。（剩余12256字）