Laboratory Drilling Rate and Filtration Studies of Clay And Polymer Drilling Fluids

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1、5a-LaboratoryDrillingRateandFiltrationStudiesofClayAndPolymerDrillingFluidsCHARLESP.LAWHONWIILIAMM.EVANS”BAROIDDIV.NATIONALlEADCO.JAYP.SIMPSONHOUSTON,7EX.MEMBERSAIMEDEFINITIONSMudpressure:pressureofdrillingfluidasmeasuredRecentefjortstodesigndrillingfluidsforincreaseda

2、fterleavingthedrillingchamber(Fig,1),Thisistakentodril[ingrateshaveconfirmedsomelaboratoryresultsofbeapproximatelythemudpressurejustpastthebitandatotherinvestigators,buthaveaisoproducedadditionaldatathefaceoftheformation.thatshoukfbeconsidered.ThesedatawereobtainedunderT

3、errastaticpressure:pressurerepresentingweightofcontrolledtestconditionsusingamicrobitdri![ingmachine.overburden.C7a>sandsomepolymershavepreviouslybeenreportedtocausereductionindrillingrate.RecentdatahaveshownFormationpressure:pressureofformationfluidasthatunderlaboratory

4、conditions,suspensionsofasinglemeasuredatoutletofdrillingchamber(Fig.1).Thisiscfcyorpolymerhavesometimesgivenfasterdrillingtakentobeapproximatelythepressureoffluidinthera[esthanwhenwaterwasused.intersticesoftheformation.MeasurementshavebeenmadeofclaysuspensionsandDiffere

5、ntialpressure:differencebetweenthemudpres-polytnersuspensionscomparingfiltration(1)underAPIsureandformationplmsure.conditions,(2)whiledrillingwithtemperatureof150Fanddifjeren(ialpressureof1,000psiand(.3)underdynamicLABORATORYEQUIPMENTANDconditionsafterdriilii:g.Somecorre

6、lationbetweenin-TESTINGPROCEDUREstantaneousfiltration(whitedrilling)anddrillingratehasbeenobserved.Thedrillingequipmentwasdescribedintwopreviouspublications~’Maincomponentsareadrillingchamber,filter-heater,rotarydriveandvariable-speedcirculatingINTRODUCTIONpump.Auxiliary

7、pumpssupplypressureboostsfortheSeveralpapershavebeenpresentedthatrelateddrillingmud,terrastaticandformationpressures.Allequipmentisfluidstopenetrationrate.Generally,itwasfoundthatadesignedfor15,000psiand500F.Capacityofthecirculat-decreaseinthesolidsconcentrationresiilted

8、insignificantingsystemisapproximately7gal.Themechanicaldesignincreasesinthedrillingrate.Ofcourse,thisch