Which specific operation would typically incur the largest ton-miles using a 1-1/8” drilling line (assume a typical US onshore rig, typical BHA and drillpipe, and the same well)?
(A) Drilling from 4,000 to 5,000 ft using a 8.5 inch PDC bit.
(B) A round trip at 5,000 ft.
(C) Core from 5,000 ft to 5,080 ft.
(D) Running 7 inch 26 lb/ft casing to 5,080 ft.
See 1 RIG 5. After calculating RTTM multiply the following factors based upon the actions: 1) Trip/csg: x1; 2) Coring x2; 3) Drilling x3. This makes sense; drilling has 3x the drill line action due to tripping/wiper/drilling, coring 2x due to no wiper, and tripping is one-way.
But in this problem the multipliers are moot. A) 1,000 ft drilling, 2) 5,000 ft round trip or 10,000 ft, C) 80 ft core, running casing 5,080 ft. The round trip dominates all multipliers, or (B).
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