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===Units of Darcy's law formulas===
===Units of Darcy's law formulas===
The ''practical field system'' is widely used for practical petroleum engineering calculations. It is a hybrid system that consists of various metric, English, and oil field units. It uses the millidarcy (md) for permeability. Other dimensions and units in this system are as follows:
The ''practical field system'' is widely used for practical [[petroleum]] engineering calculations. It is a hybrid system that consists of various metric, English, and oil field units. It uses the millidarcy (md) for permeability. Other dimensions and units in this system are as follows:
* ''q''<sub>o</sub> = stock tank oil rate (STB/day, or stock tank barrels per day)
* ''q''<sub>o</sub> = stock tank oil rate (STB/day, or stock tank barrels per day)