HD Drilling, March 15

Video shows the drilling team pulling the 12-3/4 inch casing from the 700-foot pilot hole at the conduit's shore end near the shore station in Pacific City, OR. The casing (steel conductor pipe) was meant to prevent the first 700 feet of the hole from collapsing, providing a guaranteed hole through the first radius (bent at depth) and to add stability in the event that the last 1000 feet of drilling becomes difficult to push. It was also designed to prevent the loss of circulation, reduce torque and prevent key seating in the bore hole. The hole was filled with drilling mud throughout the above processes. This hydraulic pressure helps prevent the hole from collapsing during the removal and prior to the insertion of the drill pipe. 

  

 

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