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Rotating:
Onceyouhavemadeaconnectionandtheslipshaveclearedthetable,select‘valveopen’andstartupthemudpump,thenselect‘drill’modeimmediately.ThepresetfunctionsinconnectionmodewillbedisabledandnowyoucanmanipulatethequillRPMbyselecting‘forward’and‘increasingordecreasing’thepumps.
SlideDrillingInordertoholdtoolfacewhilesliding,youmustclosethegrabberonthesaversub,allowthegrabbercylindertopressure-up,andthenswitchthe‘pumps–forward/reverse’,toneutral.Thegrabberlightwillremainon.Whensliding,thegrabberisclosedandthehoistingclutchinterlockisactivated.Inordertoworkthedrillstringyoumustpushandholdthe‘override’buttononthebrakehandlecontrolboxwhilehoisting.Thisallowsthedrawworksdrumclutchtoengage.Whenrunningamudmotor,keepaccuraterecordsofthereactivetorque(motorpressure)inthestring.Atanygiventime,youmayneedtoorientthetoolfaceofthedownholemotor.Todothisthegrabberwillneedtobeopened;
ifyoudonottrackdownholetorquehistory,turningthestringinsmallincrementswillbeimpossible.Assumingthatyouknowtheamountoftorquepresent,
followthesestepstoorientthetoolface:
1.Select‘drillforward’.2.Decreasethepumpssothatxpsi(thepressureequaltothereactivetorque)ispresentonthehydraulicpressuregauge.3.Select‘grabberopen’.
4.Ifthevalueofxprovidesenoughtorque,thestringshouldnotturn.Turnthestringtotherightbyselecting:
5.‘Increasepumps’untilthepipeturnsveryslowlyandundercontrol.6.Whenyouhaveachievedtheneworientation,quicklyclosethegrabber.
Theamountoflooppressureneededtoholdthedrillstringwhenthegrabberisopenedwillchangeasdepth,andangleofbuildincrease.Thisiswhyyoushouldrecordadownholetorquehistory,becausethexvaluewillbeeasiertopredict.Turnthestringtotheleftbydecreasinglooppressure(‘decreasepumps’),and,ifthereisnotmuchreactive
torquepresent,select‘reverse’untilpositioningiscomplete,thenclosethegrabber.Note:
Themaximumreversetorqueissettopreventthestringunscrewing.Donotengagethe‘breakout’functionorthedrillstringcouldcomeapart.
Tripping:
TheTescotopdrivereducestheamountoftimeandworkinvolvedintrippingandreamingbygivingyoutheabilitytothreadintothedrillstringatanypointinthederrick.Thisisusefulwhenencounteringholeproblemswhiletripping(forinstance,pullingtight,bridgingofforwhenakickisevident).Inshort,anytimewhentheneedtopumpfluidintothewellexists,itcanbedonewithouthavingtopositionthedrillstringatfloorlevelinordertoinstallthekelly.Trippingpipewithatopdriveissimilartoconventionalmethods,withtheexceptionthattheroboticfunctionseasepipe-handlingprocedures.Atnotimeisitnecessaryfortherigcrewtopositiontheelevatorsoropenandclosethem.Thelinktiltfunctioncanpushthestandofpipetoberackedtotheworker,bothontherigfloorandtothederrickhand.Whenrunninginthehole,thederrickhanddoesnotneedtoleanouttothrowthestandintheelevators;
hecansimplyeasethestandintotheelevators,whichareextendedtowardhim.Oncethestandisplacedintheelevators,theycanbeclosedhydraulically.Afterthestandisrackedinthederrickoraddedtothestringthelinksshouldbereturnedtotheverticalhangingpositionbyselectingthe‘float’function.
Important–Thelinksandelevatorsshouldneverbemanuallyoperatedbyaworker.
ColdClimate:
Whenthehydraulictopdriveisworkinginafreezingenvironment,theoilquicklybecomesthickandthiswillreduceitseffectiveness.Whiledrilling,theheatfromthetopdrivemotor(s)warmstheoilenoughsothatthisisnotaconcern,butwheneverthequillisnotrotating,suchaswhenyouareslidedrillingortripping,thecoldclimatefunctionshouldbeused.Toactivatecoldclimatefollowthesesteps:
1.Pushinthecoldclimatebutton(ontheleftsideofthedrillerspanel).2.Selectenginespeed‘slow’.3.‘Drill’mode.4.‘Forward’pumps.5.‘Increaseordecrease’pumps,tomaintain700psionthehydraulicpressuregauge.
Whenthecoldclimatebuttonispushedinitdeenergizesthecircuittothetopdrivespeedcontrolvalveandallowstheflowofloopoiltopassthroughthemotormanifoldandcirculatestheclosedloopsystemwithoutturningthequill.Selectingenginespeedslowbringstheprimemovertoidlespeedforcoldclimateoperation.Thissavesoverallwearandtearontheenginewhenithasalowloadonit.Drillmodeallowsyoutocontrolthehydraulicpumpsinternalswashplates,whichcommandtheamountofoilflowtomaintain700psi.Forwardpumpsdirectstheoilflowinsuchawaythatitpassesthroughthemaximumamountoffiltrationbeforegoingthroughthepumpsagain.Followthesestepsinordertoproperlydisengagethecoldclimatefunction:
1.‘Neutral’pumps.2.‘Connection’mode.3.‘Neutral’enginespeed.4.Pulloutthecoldclimatebutton.
Byselectingneutralpumps,theflowofhydraulicoilisstopped.
Important:
Neverpushoutthecoldclimatebuttonwithoutthepreceding3steps.
Connectionmodekeepstheprimemoveratanidlewhentheenginespeedisswitchedtoneutral.Afterpullingoutthecoldclimatebuttonthetopdrivecannowreturntonormaloperation.
Tip:
Ifthetopdrivewillrotateandeverythingelseisoperatingnormally,doublecheckthatthecoldclimatebuttonhasnotbeenaccidentallyoperated.
Reaming:
BackreamingoutoftheholeisoneofthegreatestfeaturestheTescotopdriveprovides.Thesestepsshouldbefollowedbeforecommencing:
Note–Reamingistocommenceonlyatoperator’sdiscretionanduntilthedrillerisexperiencedwiththisoperation,theTescotechnicianshouldbealerted.
1.Ensurethecorrectsaversubisinstalledonthetopdriveandkeepitproperlydopedwhilereamingorback-reaming.2.Connectthetopdrivetothedrillstring.3.Openthemudsavervalve.4.Startthemudpumpsandestablishcirculation.5.Removetheslips.6.Select‘drill’mode.7.Pumps‘forward’Setquillspeedto30-40RPM.8.Hoistthedrillstringandclosetheelevatorsonthestand.9.Workthedrillstringuntilfreeofobstruction.Whenyouarereadytorackthestandinthederrick,theprocedureisasfollows:
1.Stoprotation.2.Stopthemudpumps.3.Settheslips.4.Breakoutthelowestconnectionwiththerigtongs.5.Hoiststandoutofthestumpandallowthepipetodrain.
6.Closethemudsavervalve.7.Lowerthestandtoapproximately2inchesabovetherotarytable.8.Ensurethegrabberisinpositionatthetoptooljoint.9.Closethegrabberandbreakoutthetopdrive.10.Oncethetopdriveisunscrewedfromthepipe,openthegrabberandthestandwillrestonthefloor.11.Hoistthetopdriveuntiltheelevatorspickupthestand.12.Linktiltforwarduntilthederrickhandhascontrolofthestandandithasbeenplacedinthebirdbath.13.Opentheelevators.14.Linktiltbacktovertical.
15.Lowerthetopdrivetothefloorandcontinuebackreamingifnecessary.Ifanobstructionisencounteredwhentrippinginthehole,orifforanyreasonitisnecessarytoestablishcirculation,i.e.wellcontrol,thetopdrivecanbeconnectedtothedrillstringquicklybyfollowingthesesteps:
1.Ifanobstructionisencountered,hoistuntilthedrillstringisfree,andaconnectionisatfloorlevel.2.Settheslips.
3.Lowerthetopdriveandguidethetoptooljointintothegrabber.Setbackuptongsontooljointatfloorlevel.4.Select‘connection’mode.
5.Rotatethetopdriveintothetoptooljointandshoulderitup.
6.Makeuptheconnectiontothespecifiedtorque.
7.Openthemudsavervalve.8.Removethetongsandtheslips.
9.Startthemudpumpsandestablishcirculation.10.Select‘drill’mode.
11.Setquillspeedto30-40RPM.
12.Reamthroughtheobstructionuntilthestringisfree.
13.Lowertopdrivetotheflooranddisconnectthetopdrive–see,breakoutconnectionprocedures.
WorkingTightHole:
Itisimportanttoknowthatwhentorqueisappliedtothedrillstringyoucannotpulluptothemaximumforcethatthepipeisratedfor.Thetopdrivetechnicianwillprovideinformationonspecificclassesoftubularsandtheirtorsion/tensionthresholds.
Intightholesituations,itwillbenecessarytofreethepipeusingthetopdrive.Withthetopdrive,theabilitytomaintainmudpumpflow,raiseandlowerthedrillstringandholdtorqueallatthesametimeispossible.Itisrecommendedthatwhenworkingtighthole,sometorquecanbeappliedtothedrillstring.Thisisbestdonebyselecting:
1.‘Drill’mode2.‘Decrease’pumps3.‘Forward’pumps4.Slowly‘Increase’pumps
Bydecreasingforwardpumppressure,therewillnotbeenoughhydraulicflowtorotatethepipe.Now,slowly‘increase’thepumpsuntilthepipebeginstorotate.Maintainenoughpressureonthehydraulicgaugetoholddrillstringintorsionwithoutreachingthetorquereliefsettingonthetopdrive.Whenmaintainingstatictorqueoverextendedtimeperiods,itisrecommendedtoincreasethepumpstoavaluelessthanthetorquereliefsettingandallowthepumpstocontrolthedesiredtorque.Ifthetopdrivetorquereliefisactivated,thehydraulicoilpassingthroughthereliefovertime,willcreateexcessiveheat.Thehotoilmay,inturn,activateapowerunitshutdown,resultinginanuntimelytorque
releaseofthedrillstring.
Thepowermoduleisequippedwithnumeroussafetyshutdowns.Whenthehydraulicoilreachesthehi