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20” Casing Operations Checklist

  • Ensure a circulating swedge is available for washing down the hole.

  • Ensure the casing tongue HT100 are on the floor together with the correct size jaws.
  • The stab-in shoe should have been installed on 20” casing joint.
  • Casing will be cemented using an inner string. Check that the centraliser, stinger string and correct back up seals are available.
  • Confirm the stinger threads are compatible for the drill pipe and a crossover is available if required.
  • Check condition of the stinger ‘o’ ring seals and replace if necessary.
  • Fit stinger centralizer 2 meters up on first joint of stinger string.
    • Ensure the inner string is drifted to the required the specifications for the wiper latch down plug.

  • Starter head should be sent out installed on full joint (or 3m pup) to avoid problems with tong bridle.

  • Programmed make up torque on Antares ER connections is 13,000 ft-lbs, with a maximum of 13,980 ft-lbs allowable.
  • Casing tally will be entered into OpenWells daily reporting software by the Drilling Supervisor
  • Total depth will be adjusted for the casing tally (allow 10 m rat hole).
  • Use one centraliser per casing joint on joint #1 (shoe) and joint #2 and one centraliser every two joints up from #3 to surface. Stop collars will be pre-installed on the pipe rack.
  • Use only spring bow type centralisers. Do not install any centraliser on the pup joint below the wellhead housing, and do not use any solid centraliser.
  • Use thread locking compound on the first two connections.
  • Visually inspect the bore of all joints on the rack to ensure they are debris free.
  • Accurately measure, the distance from the rig floor to the land off point. 
  • Obtain wellhead orientation drawings from Superintendent.
  • 20” casing circulating head must be on the rig floor prior to running the string. Hose or chicksans should be already connected to the standpipe.
  • Ensure that the cellar jet is rigged to route returns to the shaker header tank, with a bypass valve to allow cement returns to be dumped in the cuttings/waste tank. OR ensure that there is a vacuum truck available to suck fluid directly out of the cellar.
  • Ensure sugar is available on the rig site. Sugar is to be added to the cement returns in the cuttings/waste tank to avoid cement setting.
  • Ensure final cement slurry recipes have been received from Operations Engineer.
  • Prepare the mix water for the next cement job while running the casing. Ensure that all tanks and lines are clean. Transfer the required Technical Water volumes to the batch mixers.
  • Ensure water is supplied from drilling camp technical water tank. Prepare the lead mix fluid first to let it hydrate whilst preparing the tail mix fluid. Add chemicals to the Technical water per confirmed recipe.
  • Hold a pre-job technical and safety meeting with all personnel involved in running and cementing the casing string.
  • Make up shoe track and confirm float function (DSV will check inside for debris).
  • Run 20” casing.  Fill each joint as it is run.  DO NOT PICK UP AND MOVE THE CASING STRING UNECCESSARILY to avoid surging the formation.
  • Limit running speed to 45-60 sec / joint (slip to slip).
  • Pick up 20 ¾” wellhead head housing and make up to 20” casing.
  • Connect top drive and circulate last joint to TD.
  • Land the 20 ¾” wellhead head on the 30” Conductor pipe. Reciprocate a few times before landing to centre well.
  • Orientate 20 ¾” casing head. Confirm orientation with Superintendent.
    • Check that the orientation and bolts position on the top flange will be compatible with the position of the diverter lines when the diverter is installed. If welding on the diverter has to be done, ensure it is done off-line.

  • Secure the base flange onto the 30” conductor to ensure no movement possible during cementation.

  • It is essential that the 20” conductor is aligned vertically with the ROTARY TABLE When aligned, the 20” starter head should be tack welded in position on the 30”

  • Remove the running tool and RIH with inner string DP/HWDP stab-in assembly.

  • Should hole conditions prevent the landing of the wellhead on the 30" conductor, pull back wellhead above rig floor and space out (Csg pup jt) to enable landing the CHH.
  • If casing is stuck, it will be cemented in place and the backup emergency Sliplock 20 ¾” casing head housing will be installed afterwards.