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时间:2019-06-27
《气井连续携液机理》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、第33卷第4期石油学报Vol.33No.42012年7月ACTAPETROLEISINICAJuly2012文章编号:0253-2697(2012)04-0681-06气井连续携液机理王志彬李颖川(西南石油大学油气藏地质及开发工程国家重点实验室四川成都610500)摘要:平行气流中的液滴趋于椭球状,而低黏度液滴临界韦伯数Wecrit相差较大,在2.2~60变化,而已有的携液模型未综合考虑液滴变形和液滴尺寸差异对气井临界携液气量的影响。根据液滴质点力平衡理论,笔者导出了气井临界携液气量预测新模型。新模型引入的特征参数Ck
2、,We综合考虑了液滴变形和最大液滴尺寸差异对携液气量的影响。根据一般能量守恒原理,推导出了液滴变crit形程度与临界韦伯数的函数关系,计算结果与实验数据和DDB模型预测结果一致,误差小于6%。新模型的关系式系数Ck,We在crit2.14~4.79变化,而根据文献数据和国内气田临界气流量反算的系数Ck,We在1.86~5.0变化。新模型从机理上解释了各气田临crit界携液气量相差较大和个别气田临界携液气量较低的原因,并以大牛地气田为例介绍了该模型的应用。关键词:气井携液;液滴变形;临界韦伯数;液滴模型;临界流量中图分类
3、号:TE124文献标识码:AThemechanismofcontinuouslyremovingliquidsfromgaswellsWANGZhibinLIYingchuan(StateKeyLaboratoryofOilandGasReservoirGeology&ExploitationEngineering,SouthwestPetroleumUniversity,Chengdu610500,China)Abstract:Aliquiddropletisdeformedandbrokenfromaninitia
4、lspheretoanoblatespheroidinparallelairflow,andlow-viscosityliquiddropletsdiffersignificantlyinthecriticalWebernumber(Wecrit)thatvariesfrom2.2to60.Thecurrentlyusedliquidloadingmodelsgenerallyfailtocomprehensivelytaketheeffectofdifferencesinliquid-dropletdeformati
5、onandsizeontheminimumflowrateforcontinuous-removalliquidsfromagaswellintoconsideration.Basedontheliquid-dropletparticleforceequilibriumtheory,wededucedanewmodeltopredicttheminimumflowrateofliquidloading,whichintroducesacharacteristicparameterCk,Wethatcancritdesc
6、ribetheeffectofdifferencesinliquid-dropdeformationandthemaximumdropsizeontheminimumflowrateofliquidloading.AfunctiontopredictthedropdeformationmagnitudewithdifferentcriticalWebernumberswasdeducedbasedonthegeneralprincipleofenergyconservation.Thefunctionpredictio
7、nresultisinagoodagreementwithexperimentaldatagiveninliteraturesaswellasthepredictionmadefromtheDDBmodel,withadeviationlessthan6%.TheCk,Wecalculatedbythenewmodelchangesfrom2.14tocrit4.79,whiletheCk,Wederivedfromliteraturedataandtheinversionofminimumflowratesofvar
8、iousgasfieldsinChinarangescritfrom1.86to5.0.Therefore,thisnewmodelcantheoreticallyexplainthereasonswhyminimumflowratesofvariousgadfieldsdif-fersignificantlyandindivid
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