wear test report 13-9-2016 (fred nilson's 2016-10-24) word - wear test report 13-9-2016 (fred...

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MEMOTo : Internal Authors :Floris

Reference : WearTest Date :13-09-2016 Subject : QuantitativetestingofwearbyDrillpipeTooljointsinHSCC

1. Introduction Theobjectiveofthistestistoevaluatetheseverityofabrasionoftheinsideofcompositecasingbydrillpipetooljointsinatypicalverticalwellandtodeterminewhetherdrillpipeprotectorsarerequiredasmitigationduringprolongeddrillingperiods.Theconceptofthistestistorotateadrillpipetooljointatrepresentativeconditionsinsideacompositetestpipe.Thetooljointispressedlaterallyagainstthecompositepipewithanadjustableforce,inawaythattheforceisdistributedevenlyoverthecompositepipewall.Thetestparameterswerecalculatedtomatchtheapproximateconditionsinaverticalwellwithashallowpronounceddogleginthecompositecasing,forcingthedrillstringsidewayswithasideforce.Asimplewaterbasedmudwascirculatedthroughthetestsetupbothwithandwithoutsand,representingabrasivecuttings,tounderstandtheeffectthishasonwearrate.



2. Test Parameters Sideforceandtestdurationhavebeencalculatedtomatchthefollowingsituation:

• A1000mverticalwellwith95/8”HSCCinstalledfrom0mto500mand500mofsteelcasingbelow;

• Drillingouttheshoeat1000manddrillingto1500mwithanaverageROPof10m/hr;

• 5”19#Drillpipeand8tonBHArotatingat86RPMin1200kg/m3mud;• Doglegpresentat200mdepthinthe95/8”casingofrespectively1,2and3

degrees,focussingwearinthisarea.InAppendixAthecalculationofsideforceandtestdurationisprovided.Testparametersweretakenasfollows:

• Drillpiperotationspeed86RPM• Sideforce3.6,7.2and10.8kN• Feedrate0.15mm/rev(about1m/hrROPequivalent,forpracticalreasons)• Circulatingfluid:

o water,bentonite(20lbs/bblor57kg/m3)o water,bentonite(20lbs/bblor57kg/m3)and5wt%coarsesand.



3. Test Method and Equipment Thetestisconductedona4mlathe,onthebedofwhicha1.5mlongHSCCcasingpipeisinstalledandadrillpipethatcouldberotatedinsidethecasing.Foravailabilityreasonsa10.6”HSCCpipewasusedforthetestinsteadofa95/8”pipe.Nonegatingeffectsareexpectedfromusingalargerdiameterpipe.Thenon-rotatingcasingismovedaxiallyandcanbepressedagainstthedrillpipetooljointwithanadjustableforce.Thedrillpipehas5”diameterwithNC50tooljointswithanODof170mmandstandardhardfacing.Seepicturesbelow.Thesetupincludesacircuittocirculateabasicdrillingfluidoverthecontactareabetweenthehardfacingandtheinnerwallofthecasing.Thebatch-mixedfluidiscirculatedinawayandataratetoprovideconstantandamplefloodingofthecontactarea.Duringthetests,thedrillpipewasrotatedat86RPMandthecompositecasingsamplewasmovedintheaxialdirectionduringthetestatarateof0.15mmperrevolution.Atthepointwherethehard-bandingwasexitingthecasing,theaxialmovementwasreversed.

Overviewoftestsetup



Drillpipetooljointinsidecompositecasing

ProcedureforTestingTherelevantpointsofthetestingprocedureareasfollows:

• Measurethedrillpipe;• Preparethecirculatingfluidandinstallandmarkthetestnumberthecasing

sample;• Startcirculationofthefluidthroughthecasingsample,ensuringthatthecontact

areaiswellflooded;• StartrotationofthedrillpipeatthedefinedRPM;• Applythedefinedamountofthesideforcetothebyregulatingthehydraulic

pressureonthejacks;• Startthefeedmovementofthelathe(axialmovementofthecasingsample);• Continuefeeduntilhardbandingexitsthecasing,thenreversefeed;• Continueuntilspecifiedtestdurationhaspassed,thenstopthelatheand

circulation;• Releasesideforce,movesampletonewposition;• Takepicturesoftheweargrooveanddocumentabnormalities;• Startthenexttest.

ProcedureforAssessingPerformance• Aftercompletingamaximumoffourtestspersample,removethecasingfromthe

lathe;• Cutthreeringsatspecifiedlocations:inthecenterand30cmfromtheedges(see

schematicbelow);• Calculatethewearbymeasuringonbothsidesofeachringthewallthicknesson

bothsidesofthegrooveandinthedeepestpartofthegroovewithacaliper;



• Averagethewearoverthesixmeasurementareas(threeringsx2sideseach);• Takepicturesanddocumentabnormalities;• Evaluatetestresults.

Schematicviewofthecasingindicatingareaswherethewallthicknesswasmeasured.

30cm 15cm

150cm

15cm 15cm 30cm



4. Results Thesamplecasingswerecutintopiecesasperbelowschematicdrawing.Onbothsidesofeachringthevirginwallthicknesstotheleftandrightoftheweartrackweremeasuredandremainingwallthicknessinthedeepestpartoftheweartrack.Theresultswereaveragedoverthethreerings.

Testnumber Sideforce Fluidtype Duration Avgwear(mm)

2 370kgf Water,bentonite 6hrs 0.1



1 370kgf Water,bentonite,sand 6hrs 0.2



Pictures

Exampleofwearpattern.Test#3,duration6hours,sideforce1100kgf,water+bentonitefluid



Exampleofwearpattern.Test#7,Sametestconditionsasabove,butwith5wt%sandinthecirculationfluid.



5. Conclusions Theresultsshowthatforthestudiedcaseofdrilling500mthroughaverticalsectionofcompositecasingwithinwhichanadversedoglegofupto3’ispresent,theweareffectofdrillpipegrindingontothecasingwallislighttomoderate.Wearratesapproximatelydoubledwhen5wt%sandwasaddedtothecirculatingfluid.Maximumaveragewearof0.6mmwaswitnessed.Aclosestudyofthewearpatternappearanceshowsthatinallcases,thewearhadnotpassedintothefiberlayerandremainedintheresin-richlayerontheIDofthepipe.



Appendix A



Appendix B

wear test report 13-9-2016 (fred nilson's 2016-10-24) word - wear test report 13-9-2016 (fred...

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