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1、第31卷第3期石油學(xué)報(bào)Vo1.31No.32010年5月ACTAPETROLEISINICAMay2010文章編號(hào):0253—2697(2010)03—0506—05井簡(jiǎn)中蒸汽一氮?dú)饣旌衔锪鲃?dòng)與換熱規(guī)律林日億’李兆敏。(1.中國(guó)石油大學(xué)儲(chǔ)運(yùn)與建筑工程學(xué)院山東東營(yíng)257061;2.中國(guó)石油大學(xué)石油工程學(xué)院山東東營(yíng)257061)摘要:針對(duì)注蒸汽開采稠油過程中出現(xiàn)的蒸汽超覆、竄流及熱損失等問題,進(jìn)行了氮?dú)廨o助蒸汽注入技術(shù)研究,建立了蒸汽一氮?dú)饣旌衔镌诰仓辛鲃?dòng)和換熱的數(shù)學(xué)模型。利用該模型研究了混合物在井筒中的流動(dòng)與換熱規(guī)律,分析了井口氮?dú)庾⑷肓髁亢途谡羝啥葘?duì)蒸汽一氮?dú)饣旌衔?/p>
2、在井筒中的流動(dòng)壓力、溫度、干度的影響。結(jié)果表明,隨著混合物的注入,混合物壓力及蒸汽分壓不斷增加,混合物溫度不斷升高,氣體干度和蒸汽干度不斷下降,向地層的散熱由靠水蒸氣凝結(jié)釋放汽化潛熱提供。井口注入氮?dú)饬髁吭龃?,有利于提高井底的蒸汽和氣相干度,減小井筒熱損失。現(xiàn)場(chǎng)應(yīng)用表明,注入蒸汽一氮?dú)饣旌衔锬芴岣邿崮芾寐?,增大油氣比。關(guān)鍵詞:蒸汽一氮?dú)饣旌衔?;流體流動(dòng);井筒換熱;氣液相平衡;氮?dú)廨o助蒸氣注入技術(shù)中圖分類號(hào):TE357文獻(xiàn)標(biāo)識(shí)碼:AFlowfeaturesandheatexchangelawsofsteam—nitrogenmixtureinthermalrecovery
3、wellboreLINRiyiLIZhaomin(1.CollegeofArchitecture&StorageEngineering,ChinaUniversityofPetroleum,Dongying257061,China;2.SchoolofPetroleumEngineering,ChinaUniversityofPetroleum,Dongying257061,China)Abstract:Aimedattheissuesofsteamoverlap,channelingflowandheatlossintheprocessofheavyoildevelop
4、mentwithsteamin—jection,thenitrogen-assistedsteaminjectiontechniquewasresearched.Themathematicalmodelsforsteam—nitrogenmixtureflowandheatexchangeinwellborewereestablishedonthebasisofheattransferprincipleandflowtheory.Theflowfeaturesandheatex—changerulesofthemixtureinwellborewereanalyzed.T
5、heeffectsofthenitrogenflowrateandsteamqualityatwellheadonthepressure,temperatureandsteamqualityofthemixtureflowwerediscussed.Theresultsshowedthatthemixturepressure,steampartialpressureandthemixturetemperatureincreasedasthemixturewasinjectedintowellbore,butthesteamqualityandgasdry—nessdesc
6、ended.Theheatlossofformationwasprovidedbythelatentheatofsteamvaporcondensation.Increasingnitrogenflowrateatwellheadishelpfu1tOimprovethesteamqualityandgasdrynessfractionatwellbottomanddecreasetheshaftheatloss.Fieldapplicationshowedthatthesteam—nitrogenmixtureinjectioncouldimprovetheutiliz
7、ationrateofheatenergyandincreaseoil-gasratio.Keywords:steam-nitrogenmixture;fluidflow;heatexchangeinwellbore;gas—liquidequilibrium;nitrogen—assistedsteaminjectiontechnique注蒸汽是開采稠油、重質(zhì)原油有效而經(jīng)濟(jì)的方油中,使原油黏度降低,且隨壓力的增加,溶解氣量增法]。然而,注蒸汽技術(shù)本身還存在一些不足:井筒熱大,原油越稠,氮?dú)馊芙饨叼ばЧ斤@著_4;④氮?dú)獾膿p失