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SOFTWARELICENSEAGREEMENTTHISISALEGALAGREEMENTBETWEENYOU,THEUSER,ANDSIGNAENGINEERINGCORPBYUSINGHUBS,YOUAGREETOBEBOUNDBYTHETERMSOFTHISAGREEMENTIFYOUDONOTAGREETOTHESEITEMS,EXITHUBSANDTHISUSERSGUIDEIMMEDIATELYTHISSOFTWAREISPROTECTEDBYUNITEDSTATESCOPYRIGHTLAWSANDINTERNATIONALTREATIESANDCANBEUSEDONLYBYLICENSEDUSERSYOUMAYNOTDISCLOSETHISSOFTWAREANDITSUSERSGUIDETOTHIRDPARTIESONLYTHEOUTPUTRESULTSFROMTHISSOFTWARECANBEDISCLOSEDTOTHIRDPARTIESSIGNAENGINEERINGDOESNOTWARRANTTHATTHEFUNCTIONSOFTHISSOFTWAREWILLMEETYOURREQUIREMENTSORTHESOFTWAREISERRORFREEINNOEVENTSHALLSIGNAENGINEERINGBELIABLEFORYOURUSEOFTHISSOFTWAREANDFORANYRESULTSOBTAINEDFROMTHISSOFTWAREINTRODUCTIONHYDRAULICDESIGNOFANUNDERBALANCEDOPERATIONISTHEKEYTOITSSUCCESSANDREQUIRESMANYSPECIALCONSIDERATIONSDURINGANUNDERBALANCEDOPERATION,BOTHLIQUIDANDGASMAYBEINJECTEDINTOTHEWELLASCIRCULATINGFLUIDSDUETOTHEUNDERBALANCEDCONDITIONOFTHEWELLBORE,FORMATIONGAS,OIL,ANDWATERCOULDFLOWINTOTHEWELLBOREINADDITION,SOLIDPARTICLESCUTTINGSAREALSOFLOWINGWITHALLTHEFLUIDSINTHEWELLBOREANNULUSTHEINTERACTIONSBETWEENTHESECOEXISTINGFLUIDSANDCUTTINGPARTICLESREQUIRESPECIALTREATMENTDURINGTHEHYDRAULICCALCULATIONSDUETOTHEDIFFERENCEINHYDRAULICPROPERTIESDENSITY,VISCOSITY,ANDCOMPRESSIBILITYAMONGTHECOEXISTINGPHASES,THEYDONOTFLOWATTHESAMESPEEDTHESEPHASESCANFLOWWITHVARIOUSFLOWPATTERNSBUBBLEFLOW,MISTFLOW,SLUGFLOW,WAVYFLOW,ANNULARFLOW,ETCFLOWPATTERNSAFFECTNOTONLYTHEFLOWINGMIXTUREDENSITYANDITSFRACTIONALPRESSURELOSS,BUTALSOTHEEFFICIENCYOFCUTTINGTRANSPORTATIONPHASECHANGEBETWEENLIQUIDANDGASPHASESCANOCCURALONGTHEFLOWPATHOFANUNDERBALANCEDOPERATIONDUETOTHEVARIATIONOFPRESSUREANDTEMPERATUREALONGTHEFLOWPATH,GASMAYVAPORIZEFROMLIQUIDHYDROCARBONSOROTHERLIQUIDFLUIDS,ANDLIQUIDCOULDCONDENSEFROMGASPHASESPHASECHANGEWOULDALTERNOTONLYTHERATIOOFLIQUIDANDGASPHASESINTHEWELLBOREBUTALSOTHEIRPROPERTIESITCOULDHAVESIGNIFICANTEFFECTSONTHEFLOWPATTERN,BOTHGRAVITYANDFRICTIONPRESSURELOSS,ANDTHECUTTINGCARRYINGCAPACITYOFTHECIRCULATINGFLUIDSPARASITESTRINGSANDJETSUBARESOMETIMESUSEDDURINGANUNDERBALANCEDDRILLINGAPARASITESTRINGMAYBEEITHERASMALLTUBINGATTACHEDTOTHEOUTERDIAMETEROFANEXISTINGCASING,ORATEMPORARYCASINGRUNINTOTHEWELLBOREANNULUSCREATINGANEXTRAANNULUSBETWEENTHETEMPORARYCASINGANDANEXISTINGCASINGAPARASITESTRINGISUSEDTOINJECTADDITIONALFLUIDINTOTHEWELLBOREANNULUSATASPECIFIEDLOCATION,WHILEAJETSUBISUSEDTOBYPASSAPORTIONOFTHECIRCULATINGFLUIDFROMTHEDRILLSTRINGINTOTHEWELLBOREANNULUSHUBSWASCREATEDTOASSISTTHEUSERINTHEHYDRAULICDESIGNOFUNDERBALANCEDOPERATIONSITINCORPORATEDALLTHEABOVECONSIDERATIONSASWELLASMANYOTHERFEATURESONEOFTHEUNIQUEFEATURESOFHUBSISITSCAPABILITYTOPREDICTOPTIMUMCIRCULATINGRATEFORVARIOUSDRILLINGCONDITIONSHUBSISDESIGNEDTOHANDLEANYDRILLINGFLUIDTYPEINCLUDINGGAS,MIST,FOAM,GASIFIEDLIQUID,ANDCONVENTIONALMUDABOUTHUBSTHISHYDRAULICUNDERBALANCEDSIMULATORHUBSWASDESIGNEDTOPERFORMHYDRAULICCALCULATIONSFORUNDERBALANCEDOPERATIONSHYDRAULICDESIGNISTHEKEYTOTHESUCCESSOFANUNDERBALANCEDOPERATIONBECAUSE1HYDRAULICDESIGNDETERMINESWHETHERORNOTTHEOPERATIONISUNDERBALANCEDANDHOWMUCHUNDERBALANCEDMARGINEXISTSBETWEENTHEFLUIDPRESSUREINTHEWELLBOREANDTHEFORMATIONPRESSURE2HYDRAULICDESIGNISTHEKEYTOACHIEVEANEFFECTIVEHOLECLEANINGWHICHHASASIGNIFICANTEFFECTONTHEEFFICIENCYOFUNDERBALANCEDDRILLINGOPERATIONS3HYDRAULICDESIGNISTHEBASISFORSELECTIONOFPUMP,COMPRESSOR,FLUIDHANDLINGEQUIPMENT,ANDOTHERFACILITIESAMONGOTHERADVANCEDFEATURES,HUBSOFFERSTHEFOLLOWINGCALCULATIONSPRESSURE,VELOCITYANDCUTTINGACCUMULATIONPREDICTIONCIRCULATIONFLOWRATESOPTIMIZATIONPRESSURESMATCHINGALONGTHEFLOWPATHUNDERBALANCEDDRILLINGWITHDOWNHOLEMOTORMUDCAPDRILLINGSIGNAENGINEERINGCORPCONTACTSHIFENGTIAN2NORTHPOINTDR,SUITE550PHONE2817741020HOUSTON,TX77060FAX2817741098HTTP/WWWSIGNAENGINEERINGCOMEMAILSTIANSIGNANETFEATURESHUBSOFFERSTHEFOLLOWINGFEATURESLANDOROFFSHOREOPERATIONSVERTICAL,DEVIATEDORHORIZONTALWELLSDRILLSTRINGORCOILEDTUBINGOPERATIONSNORMALORREVERSECIRCULATIONGAS,LIQUID,FOAMORMULTIPHASEFLOWWITHORWITHOUTCUTTINGSOPTIMALFLOWRATEDESIGNPRESSURE,VELOCITY,LIQUIDHOLDUPANDCUTTINGACCUMULATIONPREDICTIONPRESSUREMATCHINGCALCULATIONMULTIPLERUNSFORTHESAMEWELLVIEWWELLBORECONFIGURATIONPARASITETUBINGORPARASITECASINGUSERSPECIFIEDJETSUBLOCATIONHANDLESUPTOSIXFLUIDPHASESPHASEEQUILIBRIUMCALCULATIONMULTIPLEPRODUCTION/LOSTCIRCULATIONZONESKICKS/LOSTCIRCULATIONDEPENDSONPIORUSERSPECIFIEDRATESHELPINPIESTIMATIONFORMATIONINFORMATIONBYMDORTVDFORMATIONTEMPERATUREANDPRESSUREBYGRADIENTORMEASUREDPOINTSFOURRHEOLOGYMODELSHELPINRHEOLOGYMODELSELECTIONTRACKINGINSITUPROPERTIESOFLIQUIDANDGASVARIOUSMULTIPHASEFLOWPATTERNSSONIC/SUBSONICFLOWANDJOULETHOMSONEFFECTATBITNOZZLESSURVEYDATAORSTANDARDWELLTRAJECTORYSURVEYBYMDORTVDTUBULARDATASELECTIONFROMDATABASEGASPROPERTYSELECTIONFROMDATABASEPROPERTYSELECTIONOFFLUIDCOMPONENTSFROMDATABASEENGLISH,METRIC,ORCUSTOMIZEDUNITSDATABASEMANAGEMENTPORTABLEINPUTDATADISPLAYRESULTSINMSEXCELRUNHUBSOVERINTERNETHUBSHASBEENDEVELOPEDASBOTHANINTERNETAPPLICATIONANDAPCAPPLICATIONBEINGANINTERNETAPPLICATION,HUBSCANBERUNFROMANYWHEREINTHEWORLDPROVIDEDTHEUSERHASTHEACCESSTOTHEINTERNETTHEINTERNETVERSIONOFHUBSISRUNNINGONSIGNASNETWORKSERVERANDMAINTAINEDBYHU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