PetroBowl Practice Test

This term describes the difference between average reservoir pressure and the flowing bottomhole pressure.

Backflow Overbalance Underbalance Drawdown

Correct Answer:

Drawdown

Explanation:

The difference between the average reservoir pressure and the pressure at the bottom of the well while fluids are flowing is called drawdown. This pressure drop is the driving force that pushes fluids from the rock into the well and up to the surface. The reservoir pressure represents the energy available to push fluids into the pore spaces, while the flowing bottomhole pressure represents the resistance the fluids face as they move through the wellbore. The larger this difference, up to practical limits, the more energy is available to sustain production. This concept is different from overbalance or underbalance, which describe the relation between wellbore pressure and formation pressure in drilling contexts, and from backflow, which is flow in the opposite direction.

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