What is the oilfield unit for Wellbore storage, C?

What is the oilfield unit for Wellbore storage, C?

• A. psi/bbl
• B. ft^3/psi
• C. bbl/psi
• D. bbl/ft

Answer: (C)

Wellbore storage is about how much fluid can be accommodated in the wellbore for a given change in pressure. The storage term in pressure-analysis equations is a ratio of volume to pressure, so its units must be volume per pressure. In oilfield practice, volumes are typically expressed in barrels and pressure in psi, giving the unit barrels per psi. The other options don’t fit because they either invert the ratio (psi per barrel), use a different volume unit (cubic feet) instead of the standard barrel, or describe volume per length rather than per pressure.

Wellbore storage is about how much fluid can be accommodated in the wellbore for a given change in pressure. The storage term in pressure-analysis equations is a ratio of volume to pressure, so its units must be volume per pressure. In oilfield practice, volumes are typically expressed in barrels and pressure in psi, giving the unit barrels per psi. The other options don’t fit because they either invert the ratio (psi per barrel), use a different volume unit (cubic feet) instead of the standard barrel, or describe volume per length rather than per pressure.