Pressure Drawdown

Definition - What does Pressure Drawdown mean?

Pressure Drawdown is the differential pressure which helps in moving hydrocarbons from a reservoir into the wellbore. Surface chokes are helpful in controlling the Pressure Drawdown. When sand is produced from a reservoir the surface chokes also limit the Pressure Drawdown. The Pressure Drawdown can then be safely applied when hydrocarbons are being produced and damage which is caused by sand production can be avoided.

Petropedia explains Pressure Drawdown

To perform Pressure Drawdown, certain tests known as Pressure Drawdown tests are carried out. The purpose of performing such tests is to determine skin factor, permeability and reservoir boundary distances. When the drawdown tests are performed, the well needs to be closed for sufficient period of time in order to allow the stabilization of pressure throughout the formation. The advantages of the Pressure Drawdown test are:

  • Uninterrupted flow once oil or gas well is online.
  • Reservoir boundaries are easy to locate
The main disadvantage of performing drawdown test is that surface chokes need to be changed periodically in order to maintain a constant flow rate.

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