油气井压力控制-关井压力恢复和读取时机分析

:(No.50076029):,,19557,1981,1992,(),:0253O2697(2002)05O0110O03(102200):;,,,:;;;;:TE21:A,,,,,,[16],,,1015min[13],520min[46][78],,[911],,,,1UFig11U-shapetubetheoryofshut-in1,,,,U[8],11,,,,,,,pd+pmd=pp=pa+pma(1)pd,MPa;pmd,MPa;pp,MPa;pa,MPa;pma,MPa,,(1)pp,2,,,,U,23520029ACTAPETROLEISINICAVol.23No.5Sept.2002,,,,,,,,,,,,,(2)()[12]:p(r,t)=pi+9.210410-4qscBg(Kh)-1Ei[6.94410-2r2(t)-1](2)pi,MPa;p(r,t)r,MPa;r,m;h,m;qsc,m3/d;K,m2;;,mPas;Bg(2),r,p(r,t)pwf(t),pwf,,,,,pwfpi,,,,,,,,,,,,,,,,,,(1)pd+pmd=pp+ppc=pa+pma(3)pmd,MPa;ppc,MPappc,ppc(3):(1),,,,pmdpmapdpa(4)(2):,,,;,,,:,;,,(3),,,,,pmdpma,pdpa,3(1),,,,1115:(3),ppc,pdpmd,papma,pdpa,ppcpmapmd,(3),(2)2Fig12Thevaryingcurvsofstandpressureandcasepressureaftershut-in,t0,,t1,,,t2,,t5,,,t1;t3,,t3t2,,t6,t6t5,,t4t3,t7t6,,,,,2,,,:,,,,,,,41015min,,:,,,;,,[1]().()()[M].:,1990:8768791[2].()[M].:,1981:97981[3].[M].:,1993:5315341[4]IMCO.[M]..:,1986:1391401[5].[M].:,1996:81821[6],.[M].:,1997:1271281[7].[M].:,1990:62641[8]NealAdans.Wellcontrolproblemsandsolutions[M].PrintedintheUnitedStatesofAmerica,1980:1011651[9],.[M].:,2000:2152481[10],.[J].,1997,18(3):1281331[11],.[J].,1995,23(3):131[12].[M].:,1997:82861(2002O05O09)211200223RELIABILITYANALYSISOFTANKATNORMALPRESSURELIUYang,etal.(DaqingPetroleumInstitute,Anda151400,China)ACTA2002,23(5):96100Abstract:Acalculationmethodforreliabilityofdesignparametersoftank,suchasload,dimension,materialproper2ty,wasproposed.Thestructuralstressesoftankwerecalculatedwiththeeight-dotlimitedelement.Twoundeter2minedfactorsforinfluencingstructuralfailure,e.g.randomnessandfuzzyness,weretakenintoaccount.Afuzzycriticalstateequationfordescribingfailureofleak-freetankwasestablishedaccordingtothetheoriesoffracturemechanicsandfuzzyreliability.Afuzzyweightfunctionalgorithmforcalculatingstructuralreliabilityofatankwaspresented.Amethodforcalculatingthereliabilityofcrackingontankwasalsogiven.Keywords:tank;limitedelement;fuzzymathematicsanalysis;calculationmethodEXPERIMENTSTUDYOFPIGGINGTECHNOLOGYFORMULTIPHASEFLOWINPIPELINESLIYu-xing,etal.(UniversityofPetroleum,Dongying257062,China)ACTA2002,23(5):101104Abstract:Thetestloop,dataacquisitionsystemandexperimentmethodsusedforthepiggingstudyarebrieflyin2troduced.Theparametersofaccumulatedliquidinthepipe,piggingtime,pressureandflowratechangeswithtimeweremeasuredintheexperiment.Thefactorsinfluencingthepiggingtimeofmultiphaseflowinpipelinearedis2cussedinthepaper.Thevariationoftheoriginalandterminalpressureandflowrateinthecourseofpiggingisana2lyzed.Thedatameasuredintheexperimentarealsocomparedwiththecalculatedresults.Itissignificantforthemultiphasepiggingoperation.Keywords:multiphaseflow;gas-liquidflow;piggingtechnology;experimentalstudy;flowparameterGAPELEMENTMETHODFORFRICTIONALRESISTANCEANALYSISOFWHOLEDRILLSTRINGINPROSPECTINGHORIZONTALWELLZHANGXue-hong,etal.(DaqingPetroleumInstitute,Anda151400,China)ACTA2002,23(5):105109Abstract:A3-Dmechanicalmodelforcalculatingthefrictionalresistanceofthewholedrill-stringinhorizontelwellisbuilt,andthemechanicalanalysisonfrictionalresistanceofdrillstringwithgapelementmethodwasputfor2ward.Takingintoaccounttheinfluenceofthebendingrigidityofdrillstringonitsdeformationandfrictionalresis2tance,acalculationprocedureforthecontactforce,frictionalforce(includingthefrictionalresistancemoment)anddistributionpatternalongtheaxiallineofdrillstringthatproducedbywholedrill-stringandwellwallin3-Dspaceisgiven,andthecorrespondingsoftwareismade.Thefieldexperimentshowsagoodresult.Theaverageerroroftheresultinfieldtestislessthan515%,incomparisonwiththetheoreticalforecastedfrictionalresistance,whichprovesthatthemechanicalmodelandtheoreticalmethodpresentedinthisarticleiscorrectandvalid.Atheoreticalbasismaybeprovidedforanalyzingandforecastingthefrictionalresistanceinhorizontaldrilling.Ahighcalculationprecisioncanbeobtained.Keywords:horizontaldrilling;wholedrill-string;frictionalresistance;gapelementmethod;finiteelementmethodANALYSISONTHEPRESSUREBUILDOUPANDITSRECORDINGTIMEAFTERSHUTOINLIXiang-fang,ZHUANGXiang-qi(UniversityofPetroleum,Beijing102249,China)ACTA2002,23(5):110112Abstract:Thepressurebuild-upprincipleaftershut-inisanalyzed.Therelationshipbetweenslippageandascen2danceofgasinannulusaswellasvariesofstandpressureandcasepressureinthewellcontrollingprocessarede2scribed.Onthebasisoftheoryofgasreservoirengineering,thebuild-upcharacteristicsofpressureaftershut-inarediscussed.Amethodforacquiringshut-inpressureofreservoirswithdifferentpermeabilitiesisproposed.Keywords:shut-in;pressurebuild-up;shut-inbottom-holepressure;shut-informationpressure;acquiringmethodVol.23No.5[8]ACTAPETROLEISINICASept.2002