Drilling with Casing - A DEFINITION

SPEDISTINGUISHEDLECTURERSERIESisfundedprincipallythroughagrantoftheSPEFOUNDATIONTheSocietygratefullyacknowledgesthosecompaniesthatsupporttheprogrambyallowingtheirprofessionalstoparticipateasLecturers.AndspecialthankstoTheAmericanInstituteofMining,Metallurgical,andPetroleumEngineers(AIME)fortheircontributiontotheprogram.DrillingwithCasing:WhatitCanandCan'tDoforanAssetWhatitCanandCan'tDoforanAssetTommyWarrenTommyWarrenTescoCorp.TescoCorp.TulsaTulsa

RotarysteerableRotarysteerable

FixedcutterbitsFixedcutterbits

Shock&vibrationShock&vibration

SeismicatthebitSeismicatthebit

DrillingwithcasingDrillingwithcasing

CoiledtubingCoiledtubingdrillingdrilling10technologiestoinvestinthisdecade

StimulationStimulation

ProppantsProppants

WelltractorsWelltractors

ESPESPDrillingDrillingCompletionCompletionProductionProductionFromRichardSpearsFromRichardSpears––20052005--2006SPEDistinguishedLecture2006SPEDistinguishedLectureWhatisit?Whatisit?Howcanithelpyou?Howcanithelpyou?DrillingwithCasing-ADEFINITIONProcessforsimultaneouslydrillingandProcessforsimultaneouslydrillingandcasingawellwherecasingawellwhere::thewellcasingisusedforthedrillstring.thewellcasingisusedforthedrillstring.thecasingisrotatedasneededtodrill.thecasingisrotatedasneededtodrill.thecasingiscementedinwellatTD.thecasingiscementedinwellatTD.Drillingwithcasinghasoldroots,buthasonlyrecentlybecomepracticalbecauseofmorerobusttools.Spindletopdiscoverywelldrilledwith10”casing!Benefitsofcasingdrillingwereunderstoodveryearly.Eliminatesdrillpipe.Reducestriptime.Reducescrewsize.Reducesstuckpipe.Reducesoveralldrillingtime.Reducesoveralldrillingcost.Keepseveryfootdrilled.Casingcanbesetdeeper.Reducesaccidentsonrig.Requiresfewercasingstring.1926patent–Retrievable&re-runnablecasingbit.BenefitsIdentifiedManyYearsAgoFirstCasingDrillingSystemSystemDefined35YearsAgo•ElectricTopDrive•CasingDriveTool•Wirelineretrievable•Underreamer•CasingcentralizersRequirementsunderstood,butthehardwarejustwasn’tavailable!DownholeSurfaceBrownOilTool1971patentBrownOilTool1971patentSowhat’sdifferentnow?Topdrives-robust&common.Casingdrivetoolsavailable.PDCcutters.Robustcasingconnections&accessories.Rigautomationsystems.Betterdrillingfluidsystems.Downholetooldesigns.Directionaltools.Increasedeconomicincentive.Servicecompanysupport.

NonNon--RetrievablesystemRetrievablesystem––SimplestandmostcommonlyusedtypeSimplestandmostcommonlyusedtype––StringrotationrequiredStringrotationrequired––NodirectionaltrajectorychangecapabilityNodirectionaltrajectorychangecapability

RetrievableBHAsystemRetrievableBHAsystem––MotororcasingrotationMotororcasingrotation––MultiplerunspersectionMultiplerunspersection––DirectionalandstraightholedrillingDirectionalandstraightholedrilling

LinerdrillingsystemsLinerdrillingsystems––AlldeepwaterapplicationsAlldeepwaterapplicationsCasingDrillingSystemsTypes•WeatherfordDwC®system.Drillshoetmbits.•HughesChristensenEZCasetmdrillingshoe.•TescoCASINGDRILLING®system.•Operators’“homegrown”systems.•Manyserviceprovidersfocusingonsupport.CasingDrillingProvidersEquipmentEquipmentCasinghandlingatsurface..Protectcasingwhiledrilling..Downholedrillingtools..OilZoneDownholetoolsCasingisthe“Drillstring”SurfaceEquipmentConsiderationsfordrillingwithcasingEngineeringWellplanningOperationalpracticesHandlingtheCasing•Protectthreads•Fastconnections•Safepipehandling••Quickrig-upCasingcouplingWearBandMechanicalCasingProtectionCrimpingareaTChardfacingThermoplasticcentralizersCourtesyWeatherfordCourtesyWeatherfordCarbideCuttersCarbideCuttersTSPCuttersTSPCuttersPDCCuttersPDCCuttersNon-RetrievableCasingBitsDrillingassembly:•Lockedtocasing.•Extendsbelowcasingshoe.•Capableofmultipleruns.•Oftenretrievedwithbraidedcable.•Reliabilityiscritical.RetrievableSystemProfileNippleShoeUnderreamerBitCasingDLAMotorUnder-reamerStabilizersMWDRSSPDCBitshoeCasing•DirectionalBHACanIncludeRotarySteerableTools.•CanincludeLWD.•Wellstohorizontalhavebeendrilled.RetrievableCwDToolsCanBeUsedinComplexWellsIncentivetoDrillwithCasingLostcirculationStuckPipeKickSloughingShaleOther24%oftimefromspudtoTD(Jan2004Offshoremagazine)•Fasterprocess.•Reducesholeconditioningtime.•Reducestroubletime.•Enablesmoredifficultwells.00202010103030Time,hoursTime,hours5510101515202000WellsinorderdrilledWellsinorderdrilled1313--3/8”SurfaceCasing3/8”SurfaceCasingBatchset,drilled~800ftBatchset,drilled~800ftSaved21days,$1.5millionSaved21days,$1.5millionBohaiBohaiBayChinaBayChina––FasterProcessFasterProcessCourtesyWeatherfordCourtesyWeatherfordLowpressurethiefzone•Drilledconventionallyto7,400ft.•Ran9-5/8”casingwithdrillableshoe,conventionalfloatequipment,&crimp-onstabilization.•Drilledthroughthiefzone@20oInc.•Cementedwhilerotatingcasing.•Drilledoutshoewithrockbit.•Results•Nofluidlosses•Maintainedinclination•Savedlinerand$800,000DrillableShoeReducesTroubleTimeSteelDrillableShoeStabilizerCourtesyHughesChristensenCourtesyHughesChristensen•Lessfluidlossthanwithconventionaldrilling•AllowslowermudweightCwDImprovesHoleQualityMudWeights(pp