# Total Number of Sacks of Tail Cement Required

To determine the total number of sacks of tail cement required, you generally need the following information:

**Volume of the wellbore or casing annulus**- You need to calculate the volume that needs to be filled with cement.

**Yield of the cement**- This is usually given in cubic feet per sack (or barrels per sack). It represents how much volume each sack of cement will cover.

**Safety factor**- Often a safety factor (commonly 1.1 to 1.3) is applied to account for potential losses or overage during the job.

## Total Number of Sacks of Tail Cement Required Formula |
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\( N \;=\; (V_c \;/\; Y_c) \; SF \) |
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Symbol |
English |
Metric |

\( N \) = Total Number of Sacks of Tail Cement Required | \(dimensionless\) | - |

\( V_c \) = Total Volume to be Cemented | \(ft^3\) | - |

\( Y_c \) = Cement Yield (Usually Given by the Cement Manufacturer) | \(ft^3\;/\;sack\) | - |

\( SF \) = Safety Factor | \(dimensionless\) |

## Total Number of Sacks of Tail Cement Required Formula |
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\( N \;=\; N_a + N_c \) ( \( N_a \;=\; N - N_c \) \( N_c \;=\; N - N_a \) |
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Symbol |
English |
Metric |

\( N \) = Total Number of Sacks of Tail Cement Required | \(dimensionless\) | - |

\( N_a \) = Sacks Required by Annulus | \(dimensionless\) | - |

\( N_c \) = Sacks Required by Casing | \(dimensionless\) | - |

Tags: Drilling Drilling Cement