CirculatingSystem
SchematicofExampleRigCirculatingSystemforLiquidDrillingFluidsFig.1.23
CirculatingSystemDrillingmudtravels:SteeltanksMudpumpSurfaceconnectionContaminant-removalequipment SurfaceAnnularBitnozzleBitDrillstring
CirculatingSystemMudpumpMudpitsMud-mixingequipmentContaminant-removalequipment
MudPumpFig.1.25Volumedisplaced(onestroke):
MudPumpFig.1.25
MudPumpForwardStrokeVolumedisplaced(onestroke):BackwardStrokeVolumedisplaced(onestroke):
PumpFactor---duplexTotalvolumedisplacedpercycle(twocylinders)Fpiscommonlycalledthepumpfactor
PumpFactor---triplexthreecylinders
PumpsareratedforHydraulicpowerMaximumpressureMaximumflowrate
HydraulicPowerUnits:pressure---psiFlowrate---gal/minHydraulicPower----hp
Example1.3:Computethepumpfactorinunitsofbarrelsperstrokeforadouble-actingduplexpumphaving:6.5-inchliners--------dL2.5inchrods----------dr18-inchstrokes-------LSavolumetricefficiencyof90%----EV
Solution:Foraduplexpump,ConvertingtothefieldunitsFp=1991.2in.3/strokexgal/231in.3xbbl/42gal. =0.2052bbl/stroke
Computethepumpfactorinunitsofbarrelsperstrokeforasingle-actingtriplexpumpusingthedatasetshowninexample1.3Exercise:
Contaminant-RemovingEquipmentShaleshakerHydrocyclonesanddecantingcentrifuges
SchematicofhydrocycloneFig.1.28
DecantingCentrifugeFig.1.29
SchematicofCirculatingSystemforAirDrillingHighstrengthExtremelowpermeability
RotarySystemSwivelKellyRotarydriveRotarytableDrillpipeDrillcollars
RotarySystemFig.1.33
SwivelFig.1.34SupportstheweightofdrillstringPermitsrotation
Stabilizer
CapacityandDisplacementofPipeCapacityofpipeCross-sectionalareaofthepipeorannularexpressedinunitsofvolumeperunitLengthDisplacementofpipeCross-sectionalareaofsteelinthepipeexpressedinunitsofvolumeperuni