Drill String Weight Formula |
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\( DS_w \;=\; DP_w \cdot DS_l + DC_w \cdot DC_l + BHA_w \) (Drill String Weight) \( DP_w \;=\; \dfrac{ DS_w - DC_w \cdot DC_l - BHA_w }{ DS_l }\) \( DS_l \;=\; \dfrac{ DS_w - DC_w \cdot DC_l - BHA_w }{ DP_w }\) \( DC_w \;=\; \dfrac{ DS_w - DP_w \cdot DS_l - BHA_w }{ DC_l }\) \( DC_l \;=\; \dfrac{ DS_w - DP_w \cdot DS_l - BHA_w }{ DC_w }\) \( BHA_w \;=\; DS_w - DP_w \cdot DS_l - DC_w \cdot DC_l \) |
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| Symbol | English | Metric |
| \( DS_w \) = Drill String Weight | \(lbm\) | \(kg\) |
| \( DP_w \) = Drill Pipe Weight per foot | \(lbm \;/\; ft\) | \(kg \;/\; m\) |
| \( DS_l \) = Drill String Length | \(ft\) | \(m\) |
| \( DC_w \) = Drill Collar Weight per Foot | \(lbm \;/\; ft\) | \(kg \;/\; m\) |
| \( DC_l \) = Drill Collor Length | \(ft\) | \(m\) |
| \( BHA_w \) = BHA Weight (Bottom Hole Assembly) | \(lbm\) | \(kg\) |
Drill string weight, often referred to as the hook load, is the total weight of the drill string, which includes the drill pipe, drill collars, and any other tools or equipment attached to the string. The drillstring weight can be measured using various instruments and methods, including hook load indicators and downhole weight sensors.
