声发射地应力测量中凯塞点的确定(4)

Vol.24 No.5JournaloftheUniversityofPetroleum,China

Oct.2000(EditionofNaturalScience)

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ABSTRACTS

XUEYa-dongandGAODe-li/DETERMINATIONOFKAISERPOINTINMEASUREMENTOFGEO-STRESSWITHACOUSTICEMISSION/2000,24(5):1~3

ItisimportantanddifficulttodeterminetheKaiserpointaccuratelyinmeasurementofgeo-stresswithacousticemission(AE).TheacousticemissionsignalsofsomesandstonesamplesareanalyzedwithRescaledRange(R/S)method.Itisfoundthatthereisagoodlinearcorrelationbetweenlg(R/S)andlogisticspacingsoftime,andallthecorrelationcoefficientsaremorethan0.97.SotheconclusioncanbereachedthattheAEsignalcurvesarefractal.AnotherexperimentresultshowsthatHurstindex(H)oftheAEsignalcurvesindifferentloadstepscanreflectthevariationtendencyofsignals.TheAEsignalwillbestrongerwhenH>0.5,anditisweakerwhenH<0.5.OnthebasisofthischaracterofHurstindex,theKaiserpointcanbedeterminedcor-rectlybycalculatingtheHurstindexofAEsignalcurve.Applicationshowsthatthismethodiseffective.Keywords:groundstress;measurement;acousticemission;fractal;KaisereffectAboutthefirstauthor:XUEYa-dongisalecturer.HeobtainedMSdegreefromShanxiMiningInstitutein1996.NowheisstudyinginrockmechanismforPh.DdegreeattheDepartmentofPetroleumEngineeringintheUniversityofPetroleum,China(Beijing:102200).ZHANGGuang-qing,LUYong-mingandCHENMian/BULKINGLOADOFDRILLPIPEUNDERTORQUEANDAXIALFORCEINSLANTHOLE/2000,24(5):4~6Theenergymethodisemployedtostudythebulkingloadofdril-lpipesundertorqueandaxialforceinslanthole.

Theemphasisisplacedupontheinfluenceoftorqueonthebulkingload.Alargeamountofexperimentsarecar-riedouttoverifythetheoreticalanalysis.Theexperimentalresultsandtheoreticalcalculationareinsatisfactoryaccordance.Theaxialload,wellinclinationangleandtorquearethedominatingfactorsthatinfluencethebulk-ingofdril-lpipes.Whenotherconditionskeepunchangable,thebulkingloadofdril-lpipesincreasesnonlinearlywiththewellinclinationangle.However,torquecanreducethebulkingloadofdril-lpipesgreatly,andthede-greeofreductiongoesdownwithincreaseofwellinclinationangle.Thegreaterthetorqueandthestiffnessof

thedril-lpipeare,themoreobviousthereductionofbulkingloadresultedfromthetorquewillbe.Theconclu-sionscanbereferredtopracticalapplications.

Keywords:drilling;drillstring;stability;torque;slanthole;bulkingloadAboutthefirstauthor:ZHANGGuang-qing,male,acquiredMSdegreefromtheUniversityofPetroleumin1999.NowheisstudyingforhisPh.DdegreeintheUniversityofPetroleum,China(Beijing:102200).GAOJin-ping,GUODong-rong,LIULing,etal/PREPARATIONOFMETHYLGLUCOSIDEDRILLINGFLUID/2000,24(5):7~10

Anewdrillingfluidwithmethylglucoside(MEG)takingfromcornstarchasitsmaincomponentisstudiedinlaboratory.TheresultsindicatethatMEGcaneffectivelydecreasethewateractivityofwaterbasedrillingfluidsandimproveshalemembraneefficiency.MEGdrillingfluidshavecharacteristicsoflowwateractivity,hightemperaturestability,shaleinhibitionandgoodrehologicalproperties.Inaddition,itisreadilybiodegradableandacceptableforenvironmentprovision.

Keywords:methylglucoside;drillingfluid;wateractivity;membraneefficiency;biodegradationAboutthefirstauthor:GAOJin-ping,female,associateprofessor,graduatedfromWuhanUniversityin1982.NowsheisengagedinteachingandreseachondrillingfluidchemistryattheDepartmentofPetroleumEngineeringintheUniversityofPetroleum,China(Dongying:257061).WANGYi-fa,GUANZhi-chuan,LIZhi-gang,etal/DEVELOPMENTOFMICROCONTROLLER-BASEDAUTOMATICALMEASUREMENTSYSTEMFORDOWNHOLEMEASURINGJOINT/2000,24(5):11~13

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