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1、維普資訊http://www.cqvip.com第27卷第4期石油學(xué)報(bào)Vo1.27NO.42006年7月ACTAPETRoLEISINICAJuly2006文章編號(hào):0253—2697(20O6)04—0115-04鉆井液脈沖沿井筒傳輸?shù)亩嘞嗔髂M技術(shù)劉修善(中國(guó)石化石油勘探開(kāi)發(fā)研究院德州石油鉆井研究所山東德州253005)摘要:在隨鉆測(cè)量系統(tǒng)和閉環(huán)鉆井系統(tǒng)中,把鉆井液看作氣相、液相和固相的多相流體,研究了鉆井液脈沖的傳輸速度計(jì)算方法,分析了鉆井液的組份含量和特性對(duì)脈沖信號(hào)傳輸速度的影響。根據(jù)多相流的動(dòng)力學(xué)方程,建立了模擬鉆井液脈沖動(dòng)態(tài)傳輸特性的數(shù)學(xué)模型。研究結(jié)果
2、表明,鉆井液中的氣相和固相將對(duì)鉆井液密度和壓縮性產(chǎn)生影響,進(jìn)而影響鉆井液脈沖的傳輸速度和傳輸特性。隨著鉆井液密度和壓縮性的提高,脈沖信號(hào)的傳輸速度降低。脈沖傳輸速度對(duì)含氣量非常敏感,隨著含氣量的增加,傳輸速度迅速下降;沿井筒往復(fù)傳播的鉆井液脈沖在系統(tǒng)邊界處將產(chǎn)生折射和反射,類似于阻尼振蕩;鉆井液粘度是影響脈沖信號(hào)衰減速度的一個(gè)重要因素。該數(shù)值模擬方法簡(jiǎn)便易行,可以替代部分室內(nèi)實(shí)驗(yàn),對(duì)現(xiàn)有鉆井液脈沖傳輸系統(tǒng)的改進(jìn)以及新系統(tǒng)的開(kāi)發(fā)都具有參考價(jià)值。關(guān)鍵詞:隨鉆測(cè)量;鉆井液脈沖;閉環(huán)鉆井;多相流;數(shù)值模擬中圖分類號(hào):TE242文獻(xiàn)標(biāo)識(shí)碼:AMuitiphasesimula
3、tiontechniqueofdrillingfluidpulsetransmissionalongwellboreLiuxiushan(DezhouPetroleumDrillingResearchInstitute,SinopecExplorationandProductionResearchInstitute,Dezhou253005,China)Abstract:Inthemeasurementwhiledrillingandclosed—loopdrillingsystems,thedrillingfluidwastakenasagas—liquid—s
4、olidmulti—phase.Amethodforcalculatingthepulsevelocityindrillingfluidtravelwasproposed.Theinfluencesofcomponentofdrillingfluidandfree-gascontentindrillingfluidonthepulsevelocityofdrillingfluidwereanalyzed.AccordingtOmuhiphasefluiddynamics,themathematicalmodelandmethodstOsimulatepulsetr
5、ansmissionbehaviorofdrillingfluidweredeveloped.Theresearchresultdemon—stratedthatthesolid—phaseandfree-gascontentsindrillingfluidhadsomeinfluencesonthedensityandcompressibilityofdrillingfluidandfurtheronthepulsevelocityandtransmissionbehaviorofdrillingfluid.Thepulsevelocityofdrillingf
6、luiddeclinedwithin—creaseofdensityandcompressibilityofdrillingfluid.Also,thepulsevelocityofdrillingfluiddeclinedwithincreaseofgascontent.ThedrillingfluidpulsetransmittingupanddownalongwellborehadrefractionandreflectioncomponentssimilartOdampedoscilla—tionattheboundaryofsystem.Thevisco
7、sityofdrillingfluidhasimportantinfluencesonthepulseattenuationofdrillingfluid.TheproposedmodelandmethodscanbeusedtOsimulatetransmissionbehaviorofdrillingfluidpulsealongwellbore.Thesimulationprocesscanreplacelaboratoryexperimentsforimprovingtheexistingperformanceofdrillingfluidpulsesys
8、teman