氮气泡沫解除气井软堵塞技术及应用

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中图分类号：TE377 文献标志码：A 文章编号：1000-7393（2025）-04-0472-0

Abstract：Inthemidleandlaterstagesofgas ellproduction，"soft plugging"issuethatcommonlyoccrs intheproductionstring hasbecomeakeychallengerestrictingproductivity.Thiskindofplugingismainlyformedbythedepositionofamixtureof condensateoil，oilsdgesand，andresidualfoamingagentsunderlowflowatecondtions.Todresstis problem，thecoeptof "soft plugging"isproposed，anditsfomationmechanismisevealed.Andten，theaidamicproductionbehavioradaards after pluggingareidentified，providing animportantbasisforrecognizingsuch gaswels.Basedonthelowdensityandhighsandcarryingcapacityofnitrogenfoamfluid，a"foamdensity-flowrate"cooperativecontrolmodelisestablished.Byoptimizingthe flushingparameters，abalaneisacevedbetweenthesnd-caingeficencyofnitrogenfoamandresevoirprotection.Fieldtests in 8 wells （6 shale gas wells and 2 tight sandstone gas wells） demonstrates a 100% success rate in removing plugging， the gas productionofsinglewellisincreasedby3.3times，andthevalidityexceeds90days.Research indicatesthatnitrogenfoamflushing technologycanprovideaneconomicalandeficientsolutionfor thestableproductionofgaswellsinthemiddleandlaterstages，with significant potential for broad application.

Keywords： naturalgaswellsoft plugging;nitrogen foam flushing;pluggingremovalmechanism;coordinatedcontroloffoam density and flow rate

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