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17420058CHINAOFFSHOREOILANDGASVol.17No.4Aug.2005:,,1976,,,2004(),:22523(:100027):010-845226721122(1.;2.()),,,,,12080,,,[1],,,,(),,,,,;,,,,2090(DGD),(),,(1):(1),,,(2),,,,,,65%,5001500[2](3),,,(4),,3D(5),,;,174:2611()()(6),,,,:(1),;(2),;(3),,,,,[2-5],,,;,,2,,22,GHI22622005,(A),,,pM1=M1ghM1(1):pM1M1hM1(Pa)(kg/m3)(m);g(m/s2),,,,,(),2:pG,pH(1)minM1maxM1minM1=pGghM1(2)maxM1=pHghM1(3):hM1=hw+hf;hw;hfM1=maxM1-minM1=pH-pGghM1(4),2,minM2maxM2minM2=pG-wghwghf(5)maxM2=pH-wghwghf(6)M2=maxM2-minM2=pH-pGghf(7)(7)(4)M2M1=pH-pGghf/pH-pGghM1=hM1hf=hw+hfhf1(8)(8),,,(8),,=M2M1=hM1hf=hw+hfhf=hwhf+1(9):,,(,,);,(,)(9):hw,,;hw,,,hw,hf,,;,3311,2:[3,4,6O8](2)[9],,Simulink2133m,(3),,Simulink4:Ramp2;Subsystem7;Subsystem3;Subsystem1174:263331255:(1),,,;(2),,,,,,4Simulink5()()26420054(1),(2),(3),1..(),2002,16(2):1411442,,,..,2001,24(4):25273DeanGE.Industrygroupstudiesdual2gradientdrilling.Oil&GasJournal,1999,97(33):32334KennedyJ.Firstdualgradientdrillingsystemsetforfieldtest.DrillingContractor,2001,57(3):20235ClovisL.Feasibilitystudyonthereductionofhydrostaticpressureinadeepwaterriserusingagas2liftmethod.PhDDissertation,LSU,19976GoldsmithR.Howseafloorliftsystemsestablishdualmudgradients.Offshore,1998,58(6):1241467ForrestNetal.Subseaequipmentfordeepwaterdrillingusingdualgradientmudsystem.SPE/IADC67707,20018HerrmannRPetal.Twomethodsforachievingadualgradientindeepwater.SPE/IADC67745,20019MaurerTechnology.JIPtodevelophollow2spheredual2gradientdrill2ingsystem.DEAProject.DEA2146.2001:2005O04O07:2005O07O10(:)Researchonprincipleofdual2gradientdrillingtechnologyXuLiangbin1JiangShiquan1YinZhiming2ChenGuoming2(1.CNOOCResearchCenter,Beijing,100027;2.ChinaUniversityofPetroleum,Shandong,257061)Abstract:Thedual2gradientdrillingtechnologyisanewconceptionproposedbyforeigncompaniesinre2centyears,forwhichtherelateddrillingequipmentsandtechniqueshavebeendevelopedandbroughtintoindustryapplicationinitially.Thispaperpresentstheresearchontheprinciplesofthedual2gradientdrillingtechnologybytheoryformulaandsimulationmodel.Inviewoftheengineeringapplication,theactualconnota2tivemeaningofthedual2gradientdrillingtechniqueisthattheadjustablelimitofthemuddensityisenlargedobviously.Theeffectivefactorsofthedual2gradientdrillingareputforwardinthispaper,whichcouldbeusedintheengineeringapplication.Keywords:dual2gradientdrillingtechnology;princi2pleresearch;theoryformula;simulationmodel;ad2justablelimitofthemuddensity;theeffectivefactorsofthedual2gradientdrilling,,EOR,11/423/8in(31206103cm)7/8in(2122cm)11,13/4in(4145cm),,CarthageBerea100ft/h(3015m/h)21111/16(4129cm),,7/8in(2122cm),,,,,,,710(2005O08O23)