Designation:E1675−04(Reapproved2012)StandardPracticeforSamplingTwo-PhaseGeothermalFluidforPurposesofChemicalAnalysis1ThisstandardisissuedunderthefixeddesignationE1675;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thepurposeofthispracticeistoobtainrepresentativesamplesofliquidandsteamastheyexistinapipelinetransportingtwo-phasegeothermalfluids.1.1.1Theliquidandsteamsamplesarecollectedandproperlypreservedforsubsequentchemicalanalysisinthefieldoranoff-siteanalyticallaboratory.1.1.2Thechemicalcompositiondatageneratedfromtheanalysisofliquidandsteamsamplesmaybeusedformanyapplicationsimportanttogeothermalenergyexploration,development,andthelong-termmanagedexploitationofgeothermalresources.Theseapplicationsinclude,butarenotlimitedto,resourceevaluationssuchasdeterminingreservoirtemperatureandtheoriginofreservoirfluids,compatibilityofproducedfluidswithproduction,powergenerationandrein-jectionhardwareexposedtothefluids(corrosivityandscaledepositionpotential),long-termreservoirmonitoringduringfieldexploitation,andenvironmentalimpactevaluationsin-cludingemissionstesting.1.1.2.1Tofullyutilizethechemicalcompositiondataintheapplicationsstatedin1.1.2,specificphysicaldatarelatedtothetwo-phasedischarge,wellbore,andgeothermalreservoirmayberequired.Mathematicalreconstructionofthefluidchemistry(liquidandsteam)toreservoirconditionsisaprimaryrequire-mentinmanyapplications.Ataminimum,thisrequirespreciseknowledgeofthetotalfluidenthalpyandpressureortempera-tureatthesamplepoint.Fluidreconstructionandcomputationstoconditionsdifferentfromthesamplecollectionpointarebeyondthescopeofthispractice.1.2Thispracticeislimitedtothecollectionofsamplesfromtwo-phaseflowstreamsatpressuresgreaterthan70kPagauge(10psig)andhavingavolumetricvaporfractionofatleast20%.Thispracticeisnotapplicablet...
