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1、石油勘探與開發(fā)2922016年4月PETR0LEUMEXPL0RATIoNANDDEVEL0PMENTVb1.43NO.2文章編號:1000.0747(2016)02-0292—05DOI:10.11698/PED.2016.02.17深水鉆井氣侵程度實時定量描述方法許玉強,管志川,張會增2,張洪寧(1.中國石油大學(xué)(華東)石油工程學(xué)院;2.中海油研究總院)基金項目:國家自然科學(xué)基金(51574275);國家重點基礎(chǔ)研究發(fā)展計劃(973)項目(2010CB226706);長江學(xué)者和創(chuàng)新團隊發(fā)展計劃(IRT1086)摘要:通過分析深水鉆井氣侵特點和現(xiàn)有氣侵監(jiān)測方
2、法的不足,論證了在隔水管底部進行氣侵早期監(jiān)測的可行性,提出了基于隔水管底部超聲波氣侵監(jiān)測的氣侵程度實時定量描述方法。分析了多普勒超聲波監(jiān)測氣侵方法存在的問題,設(shè)計了隔水管底部透射式超聲波氣侵監(jiān)測實驗裝置,用于分析不同截面含氣率條件下的聲波衰減特性,給出了運用超聲波監(jiān)測隔水管處氣侵情況的解決方案。結(jié)合深水鉆井井筒環(huán)空氣液兩相流計算模型和含可信度的地層壓力預(yù)測,建立了基于隔水管底部截面氣侵監(jiān)測數(shù)據(jù)的井筒氣侵程度反算方法。該方法與常規(guī)方法相比可提前4min左右檢測到氣侵,并可根據(jù)隔水管底部聲波響應(yīng)數(shù)據(jù)準確確定氣侵發(fā)生的時刻、氣體到達井口所需時間、任一時刻的總溢流量及
3、任一時刻不同井深處的截面含氣率。圖5參15關(guān)鍵詞:深水鉆井;氣侵監(jiān)測;透射式超聲波;氣侵程度;反算方法中圖分類號:TE28文獻標識碼:AThequantitativedescriptionofgas-cutdegreeindeepwaterdrillingXUYuqiang,GUANZhichuan,ZHANGHuizeng,ZHANGHongning(1.CollegeofPetroleumEngineering,ChinaUniversityofPetroleum,Qingdao266580,China;2.CNOOCResearchInstitute,B
4、eijing100028,China)Abstract:Throughtheanalysisofgas-cutfeaturesindeepwaterdrillingandshortagesofexistinggas—cutdetectionmethods,thefeasibilityofearlydetectionofgascutattheboaomofriserwasdemonstrated,andamethodwasproposedforquantitativedescriptionofgas-·cutdegreeindeepwaterdrillingba
5、sedonultrasonicmonitoringatthebosomofriser.TheproblemsofDopplerultrasoundgas·cutdetectionmethodwasanalyzedandtheexperimentaldeviceofgas—cutmonitoringattheboRomofriserbasedontheultrasonictransmissionwasbuilt,whichwasusedtoanalyzethesoundattenuationcharacteristicsunderdiferentconditio
6、nsofvoidfraction.Thesolutionsforusingultrasoundtomonitorgas-cutsituationatthebotomofriserwasproposed.Combinedwiththegas—liquidtwo-phasemodelofwellboreannulusindeepwaterdrillingandtheformationpressurepredictionmethodwithcredibility,theinversecalculationmethodofgas-cutdegreeinwellbore
7、wasestablished,whichwasbasedonthemonitoringdataofgascutattheboaomsectionofriser.Thismethodcoulddetectthegascutaboutfourminutesinadvancecomparedwithconventionalmethods,andthegascutoccurringmoment,thetimeleftforgastoreachthewellhead,thetotaloverflowrateatanymoment,andthevoidfractionin
8、diferentdepthcouldb