wais divide parent borehole completed!...wais divide parent borehole completed! ice drilling design...

W A I S D I V I D E 2 0 1 1 - 2 0 1 2 DISC DRILL WAIS DIVIDE PARENT BOREHOLE COMPLETED! Ice Drilling Design and Operations • Assist with borehole logging • Install rooftop and slot-spanning sheaves • Remove old 3,400m cable from DISC Drill winch • Spool on new 4,200m cable • Terminate fiber optics • Deepen the main borehole to ~50m above the bed at the Chief Scientists direction • Produce high quality ice core • Adjust drilling procedures and techniques to drill and deliver warm ice, if encountered. • Test Replicate Coring capability • Elizabeth Morton served as a winch operator with Gary Clow and Frank Urban • First round of logging completed between 12/3/11-12/21/11 • Second round of logging completed between 1/1/12-1/4/12 • Five logging tools deployed • Optical dust logger • Sonic ‘snake’ logger • Seismic tool • Temperature logger • Sonic pinger • Total IDDO days at WAIS: 73 • 18 days for crew arrival, Arch work, slot work, logging set up • 9 days for cable operations • 7 days for drill start up and other Arch prep • 2 days of borehole reaming • 6 days of drilling (2 shifts) • Starting depth: 3,331.538m • Ending depth: 3,405.077m • Total meters drilled: 73.539 • Tripping speeds • Descended at 1.0 m/s with the pump running • Ascended at up to 2.0 m/s • Cutter Speed • 80rpm continues to be the sweet spot • Penetration rates • Varied with ice conditions; between 2.5-5.7 mm/s • Bore hole fluid density • Density was maintained at .920 @ -31°C throughout the season • Fluid was mixed to .935 @ -31°C to compensate for 141b loss • 4,391L (1,160 gal) of drilling fluid were used • 3,140L (830 gal) of Isopar K • 1,251L (330 gal) of 141b • Unspooled 3,400m cable off of the winch drum using the P05 cable spooler • Spooled on new 4,200m cable using the Pengo cable tensioner • It was difficult to get enough pick on the cranes due to the floor heaving in the middle of the Arch • New for 2011-2012 season • Real-time viewing of the borehole from the surface • Steffen Bo Hansen, from the Centre for Ice and Climate (CIC) in Copenhagen, Denmark, visited as a drill observer for two weeks in January • Terminated both ends of the fiber optic cable over a period of 5 days • Very acceptable levels of dB loss across all fibers FINAL BOREHOLE DEPTH: 3,405.077 meters CABLE OPERATIONS: BOREHOLE CAMERA: BOREHOLE LOGGING OPERATIONS: SEASON GOALS: DRILLING OPERATIONS: SPECIAL VISITOR:

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WAIS

DIVIDE

2011-2012

DISCDRILL

WAIS DIVIDE PARENT BOREHOLE COMPLETED!Ice Drilling Design and Operations

• Assistwithboreholelogging• Installrooftopandslot-spanningsheaves

• Removeold3,400mcablefromDISCDrillwinch• Spoolonnew4,200mcable• Terminatefiberoptics• Deepenthemainboreholeto~50mabovethebedattheChiefScientistsdirection

• Producehighqualityicecore• Adjustdrillingproceduresandtechniquestodrillanddeliverwarmice,ifencountered.

• TestReplicateCoringcapability

• ElizabethMortonservedasawinchoperatorwithGaryClowandFrankUrban• Firstroundofloggingcompletedbetween12/3/11-12/21/11• Secondroundofloggingcompletedbetween1/1/12-1/4/12• Fiveloggingtoolsdeployed

• Opticaldustlogger• Sonic‘snake’logger• Seismictool• Temperaturelogger• Sonicpinger

• TotalIDDOdaysatWAIS:73• 18daysforcrewarrival,Archwork,slotwork,loggingsetup• 9daysforcableoperations• 7daysfordrillstartupandotherArchprep• 2daysofboreholereaming• 6daysofdrilling(2shifts)

• Startingdepth:3,331.538m• Endingdepth:3,405.077m• Totalmetersdrilled:73.539• Trippingspeeds

• Descendedat1.0m/swiththepumprunning• Ascendedatupto2.0m/s

• CutterSpeed• 80rpmcontinuestobethesweetspot

• Penetrationrates• Variedwithiceconditions;between2.5-5.7mm/s

• Boreholefluiddensity• Densitywasmaintainedat.920@-31°Cthroughouttheseason• Fluidwasmixedto.935@-31°Ctocompensatefor141bloss

• 4,391L(1,160gal)ofdrillingfluidwereused• 3,140L(830gal)ofIsoparK• 1,251L(330gal)of141b

• Unspooled3,400mcableoffofthewinchdrumusingtheP05cablespooler

• Spooledonnew4,200mcableusingthePengocabletensioner• ItwasdifficulttogetenoughpickonthecranesduetothefloorheavinginthemiddleoftheArch

• Newfor2011-2012season• Real-timeviewingofthe

boreholefromthesurface

• SteffenBoHansen,fromtheCentreforIceandClimate(CIC)inCopenhagen,Denmark,visitedasadrillobserverfortwoweeksinJanuary

• Terminatedbothendsofthefiberopticcableoveraperiodof5days