Drill string capacity, abbreviated as DSC, is the volume of fluid that a drill string can hold. The drill string is the assembly of drill pipe, drill collars, and other tools that transmit drilling fluid (mud) and torque to the drill bit. The capacity is an important parameter in drilling operations as it affects the circulation of drilling fluid, which is critical for cooling the bit, carrying cuttings to the surface, and maintaining well pressure.
Drill String Capacity Formula |
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\( DS_c \;=\; \dfrac{ D_{pid}^2 \cdot l }{ 1029.4 }\) (Drill String Capacity) \( D_{pid} \;=\; \sqrt{ \dfrac{ DS_c \cdot 1029.4 }{ l } } \) \( l \;=\; \dfrac{ DS_c \cdot 1029.4 }{ D_{pid}^2 }\) |
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| Symbol | English | Metric |
| \( DS_c \) = Drill String Capacity | \( bbl \) | - |
| \( D_{pid} \) = Casing / Drill Pipe ID | \(in\) | - |
| \( l \) = Drill Hole Length | \(ft\) | - |
Drill String Capacity Formula |
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\( DS_c \;=\; \dfrac{ D_{pid}^2 \cdot l }{ 1273.24 }\) (Drill String Capacity) \( D_{pid} \;=\; \sqrt{ \dfrac{ DS_c \cdot 1273.24 }{ l } }\) \( l \;=\; \dfrac{ DS_c \cdot 1273.24 }{ D_{pid}^2 }\) |
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| Symbol | English | Metric |
| \( DS_c \) = Drill String Capacity | - | \( l \) |
| \( D_{pid} \) = Casing / Drill Pipe ID | - | \(mm\) |
| \( l \) = Drill Hole Length | - | \(m\) |