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3863(820-Q-04)33,,,1963;1985,1990;;1,Oil&GasJournal30:(100080)15:(010)62562770333()()..,2002;22(5):6871,,,,,:;;12060,2,3,,,,,,,,4,:a=Kl(1-g-s)l+gg+ss1KlE+gKlKg-1+sKlKs-1(1)=2(1+)+1(1+)1-2,=eD:gls,kg/m3;gs,m3/m3;KgKlKsE,Pa;De,m;;+-:,(13):,;18620029©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,;;23,(),5:5v5t+v5v5x+g5H5x+fv|v|2D=05H5t+v5H5x+vsin+a2g5v5x=0(2):a,m/s;H,m;v,m/s;f;,();x,m;t,s,,,n,x,t,x-t,Q,:HP=CP-TAQP-RQP|QP|HP=CM+TBQP+RQP|QP|(3)CP=HA+(B-U)QA-RQA|QA|,CM=HB-(B-U)QB+RQB|QB|TA=B+UA,TB=B+UB,B=agA,U=xsin2a,R=fx4gDA2:A,m2;P;AB453000m(),12004596225©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.m/s:,;,;(),;,,,,,,,6:p=p0exp-xL(4):L=D2Klf1KlE+gKlKg-1+sKlKs-1:p0,Pa;x,m;px,Pa;,mPas;f,Hz,,,,,p/p0:,,(68),(1),,678,,10%(2),,,,(3)0720029©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.,,,,1,..,2000;21(6):88922ArpsJJ,ArpsJL.Thesubsurfacetelemetryproblemapracticalsolution.JPT,1964;16(5):4874933SpinnerTG,StoneFA.Mudpulseloggingwhiledrillingsystemdesign,development,anddemonstration.IADC/CAODCDrillTechConf,Houston,1978:3133274,..,2000;28(5):24265,..,2000;22(4):8106,..,2001;24(6):13,12(2002-04-23)3(PLN0126)33,1969,,:(637001):(0817)2643910333()..,2002;22(5):7174,,,,,,,,:,,;,():,;();,,,;,,;,;;Warren-Root,,1,217225©1995-2006TsinghuaTongfangOpticalDiscCo.,Ltd.Allrightsreserved.thenanovelsealstructurebeneficialtoincreasinglifetimeoftheim2pactorisproposedthroughsummarizingthemeritsanddemeritsofthesestructures.Inlightoflaboratorialtestingitisprovedthatthenovelsealstructureisofreliableoperatingperformanceandlowprice,thushavinggreatsignificanceforraisingthelifetimeoftheim2pactorandforpopularizingonthespot.SUBJECTHEADINGS:Impactor,Percussive2ratorydrillingtechnology,Petroleum,Dynamicseal,NaturalgasYuanGuangjie,bornin1974,graduatedindrillingengineer2ingfromSouthwestPetroleumInstituteandreceivedhisMastersde2greein2001.NowheisstudyingforhisdoctorateinShanghaiJiao2tongUniversity.Add:No.1954,HuashanRoad,Shanghai(200030),ChinaTel:(021)62934354or62933071PREDICTIONOFSAND2SETTLEDHOLEINTER2VALBYUSINGQUASI2SPIRALPROPERTYOFDRILLINGSTRINGGuoYongfeng,JinXiaojianandChenZhizhong(ChinaOffshoreOilTechnologyServiceCo.).NATUR.GASIND.v.22,no.5.pp.6467,9/25/2002.(ISSN1000-0976;InChinese)ABSTRACT:Theauthorshavedevelopedacomputerprogrambyuseofthefiniteelementmethod,whichcandeterminetheprop2pant2carryingcapacityofthedrillingfluidinsomeholeintervalbyuseofquasi2spiralpropertyofthedrillingstringandthroughsim2ulatingthedrillstembucklingformwhenslidingdrillingisbeingconducted,andtheplaceofgrievousandcommonsand2settledholeintervalcanbepredictedthroughcombinationwithfluidmechanicsmethod.Thispredictionmethodcanbeusedasoneoftheauxiliarymeasuresusedforpreventingdownholeaccidentswhiledrilling.Theprogramhasbeentestedandverifiedintheoffshoreoilfield,obtain2ingasatisfactoryresult.Thisprogramwasappliedforinventionpatenttothestate.SUBJECTHEADINGS:Drilling,Horizontalwell,Drillingstemmechanics,Drillingfluid,Cuttingsbeds,Finiteelement,Com2putersimulationGuoYongfeng(lecturer),bornin1955,receivedhisMastersdegreefromUniversityofPetroleum(Beijing)in1994.Hehasbeenengagedinthecomputersoftwaredevelopmentandin2situtechnicalworkforoffshoreoilwelldrilling.Add:ChinaOffshoreOilTech2nologyServiceCo.,P.O.Box232,Beijing(101149),ChinaTel:(010)84522883(O)or13910798098ANANALYSISOFDRILLINGINFORMATIONTRANSMISSIONBEHAVIORINWELLBOREShiZaihong(ResearchInstituteofMechanics,Chi2neseAcademyofSeiencesandLiuXiushan(ResearchIn2stituteofPetroleumExplorationandDevelopment,Sinopec).NATUR.GASIND.v.22,no.5.pp.6871,9/25/2002.(ISSN1000-0976;InChinese)ABSTRACT:Theclosed2loopcontroltechnologyforwellboretrajectoryisresearchhighlightsintodayswelldrillingfieldbothabroadandathome,andtheinformationtransmissionfromdownholetosurfaceisanimportantlinkforthishighandnewtechnology.Atpresent,thedrillingmudpulseismainlyusedinthewirelesstrans2missionsystemtotransmitthedrillinginformationsfromdownholetosurface,buthowtoimprovethetransmissiondepthandrateisare2searchtopicallalongfordrillingmudpulsetransmissionsystem.Basedonthetheoryofmultiphaseflow,thetransmissionvelocityofthedrillingmudpulsesignalanditsinfluencefactorsandthetrans2missionbehaviorandattenuationregularityarestudiedinthispaper.Theresultsshowthatthetransmissionofthedrillingmudpulsealongwellboreissimilartodampedoscillationandthefrequenceofthesignalandtheviscosityofdrillingmudarethemajorcontrollablefactorswhichaffectthesignalattenuation.Somecalculatedandana2lyzedresultsaregivenout,whichareofreferencevalueforbothim2provementofexistingdrillingmudpulsetransmissionsystemandde2velopmentofmewsystems.SUBJECTHEADINGS:Geo2steering,Closed2loopcontrol,Measurementwhiledrilling,DrillingmudpulseShiZaihong(associateprofessor),bornin1963,graduatedfromDaqingPetroleumInstitutein1985andreceivedherMastersdegreein1990.NowSheisstudingforaPh.DattheResearchIn2stituteofMechanics,ChineseAcademyofScience.Shehaspublishedamonographandover30academicthesesinOilandGasJournalandActaPetroleiSinica,etc..Add:No.15,ZhongguancunRoad,HaidianDistrict,Beijing(10