Pressure Transient Analysis

Definition - What does Pressure Transient Analysis mean?

Pressure Transient Analysis, also known as Pressure Transient Well Test, is an assessment test carried out to determine the performance of a wellbore by measuring the pressure and flow rate in the wellbore. The test describes a detailed process that includes validation, data acquisition, and interpretations of various reservoirs. These tests are performed at various stages of the well, i.e., at the time of drilling, completion of process and production phase.

Petropedia explains Pressure Transient Analysis

When a limited amount of fluid flows through a well in Pressure Transient Analysis, the pressure in the formation is monitored over a period of time and then the formation is shut in. The pressure in the formation is monitored till the fluids in the formation equilibrate. Such analysis of the pressure changes provide the shape and size information of the reservoir and its ability to produce enough amounts of hydrocarbons for the economic viability of a well.

This analysis also helps in gathering the following information:

  • Understanding permeability of the hydrocarbons
  • Estimation of skin factor
  • Average pressure in the drainage area of testing
  • Estimation of flow barriers (if any) such as faults or cracks in between.

The advantages of the Pressure Transient Analysis include:

  • It helps in learning the well and reservoir properties.
  • It helps in optimizing the test designs.
  • It helps in minimizing the cost of field operations.
  • It helps in determining the range of uncertainties.

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