XY-4岩心钻机升降机地设计5.doc

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1、EffectiveuseofwaterinasystemforwaterdrivenhammerdrillingGöranTuomas,DivisionofRenewableEnergy,LuleåUniversityofTechnology,SE-97187,Luleå,SwedenReceived28November2002; revised10August2003; accepted18August2003. ;Availableonline14October2003.AbstractDrillingwithwaterdrivendown-the-h

2、ole(DTH)hammersisarecentlydevelopedmethodforcompetitiveproductionofboreholes.Inordertopreventlargeamountsofwaterbeingusedduringoperation,thedrillingfluidisheredirectlyprocessedintoaqualityacceptableforreuse.Theeffectivenessisevaluatedinwelldrillingwithamobileprototypewatercleaning

3、andpressurisingunit.Especiallythepresenceofabrasiveparticlesinthefluidcandrasticallyreducetoollifeandmakethemethodinefficient.Thevitalsignificanceofthisrelationhascalledfordetailedstudiesandaprocesssimulationmodelfordeterminingparticleconcentrationandsizedistributionhasbeendevelop

4、ed.Thispaperdescribesthemodelandhowitisapplied.Simulationresultsofdifferentsystemconfigurationsarealsopresented.AuthorKeywords:Drilling;DTH;Hammer;Down-the-hole;Particle;Flow;Water;SimulationArticleOutline1.Introduction2.Prototypesystemdescription2.1.Generaldescription2.2.Fluidcle

5、aningsystem3.Systemprocessmodel3.1.Hammertool3.2.Mixingtankanddrillingfluidtank3.3.Lamellathickener3.4.Hydro-cyclones4.Resultingcalculations4.1.Results5.ConclusionAcknowledgementsAppendixA.FielddataReferences1.IntroductionThetechniqueofusingwaterinsteadofairasanenergycarriertoDTH-

6、hammertoolshasbeenknownforyears.However,technicaldifficultiesassociatedwithcorrosion,cavitationandwearhavemadeitdifficultand/orcostlytoputtheseideasintopractice.Thissituationbegantochangeintheearly1990swhentheSwedishminingcompanyLKABstartedtousewaterdrivenDTH-hammersforproductiond

7、rillingofblast-holes.Theuseofthehammer-toolalsomeantcontinuousevaluationandimprovementsofthesystem,whichtodayisahighlycost-effectiveandcompetitivedrillingmethod.Today,morethan5-millionmetersofblast-holeshavebeendrilledwiththewaterdrivenhammertoolwithintheSwedishminingindustry.Ther

8、earemanyadvantageswiththismethod;