超声速喷嘴雾化排水采气技术试验研究

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中图分类号：TE371 文献标识码：ADOI：10.12473/CPM.202409019

Abstract：As one of atomization drainage gas recovery technologies，supersonic atomization has the advantages of simple structure，low costand low-pressure requirement.To studythe flow lawof the fluid inthe pipeline and the effective liquid carying distance after atomization，on the basis of the structural design of supersonic atomizing nozzle，a visual welbore flow simulation test device for nozle atomization was designedand built.Then， combined with experiments and numerical simulation，the atomization law，liquid carrying efect and influencing factors of the supersonic nozzle in the wellbore were studied.The study results show that the changes in gas inlet pressure and gas-liquid ratio affect the effective distance of atomization，and the influence of gas inlet pressure is much greater than that of gas-liquid ratio.The greater thegas inletpressure，the faster the gas flow velocity，the greaterthe effctive distance of atomization is. The greater the gas inlet pressure，the smalerthe droplet size and the more uniformthe distribution，indicating that the atomization efect is beter.The criticalliquidcarrying velocityof atomization（ 2.64m/s ）is much smaller than that of non-nozzle （4.62m/s ），indicating that the nozzle atomization reduces the critical liquid carrying velocity threshold，which is favorable for gas to carry liquid out of the well.The studyresults provide a theoretical basis for the field application of supersonic atomization drainage gas recovery technology.

Keywords：drainage gas recovery； supersonic nozzle；atomization effct；critical liquid carrying velocity; gas-liquid ratio

0 引言

在气井开采过程中，出水是一个普遍现象，它会导致气井产量急剧下降，采收率降低，生产周期缩短，开采成本提高，甚至可能导致停产[1-8]。（剩余9729字）