When do you use TVD vs MD on a Kill Sheet?
- Use True Vertical Depth (TVD) when calculating:
- Hydrostatic pressure
- Fracture pressure
- Formation pressure
- Use Measured Depth (MD) when calculating:
- Mud volumes
- Pump pressure losses
- Drill string length
- Hydraulic delay
TVD is essential for pressure-related calculations, while MD is used for volume and equipment-related calculations. Always ensure you’re using the correct depth type for each calculation.
For more information about filling out Kill Sheets, refer to my Well Control Manual at: Well Control Manual