Assess a well intervention

A production flow test followed by a PBU test before and after a well intervention will help to assess the impact of the intervention on well performance.
The evolution of the DP and derivative plots with a derivative overlay will help to clearly understand the impact on the skin, permeability and flow behaviour around the wellbore. 


Let’s assume a very simple example where we add new perforations to a slightly deviated oil well.
As shown in the plot below, the pre-intervention PBU (PBU 1) shows a permeability-thickness value of about 1,970 mD and a total skin St = -0.4 (which accounts for the slight deviation of the well).
If we plot the pressure data from the pre and post intervention PBU tests on the log-log plot, the derivative overlay is obtained below :
The derivative overlay shows a shift of the derivative downwards, which indicates an increase in permeability-thickness KH around the wellbore.
With a quick straight line analysis, we could see that perforating the new layers increased KH by 230mD.ft. Also the post-intervention response shows a decreased vertical separation between the DP and derivative plots, which suggests a slight decrease in skin. This is also confirmed with the straight line analysis.


This was a very simple example but it shows that just by looking at a plot (derivative overlay), you could quickly assess the impact of a well intervention under transient production period.
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Exploration, appraisal, development

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  • Reservoir connectivity & proven volume
  • Flow behaviour around wellbore
  • Large scale of investigation (100-1000s ft)


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  • Use of opportunistic shut-ins
  • Track permeability, skin, reservoir pressure
  • Monitor performance over time
  • Understand performance deviation
  • Assess well intervention
  • Quality control rate measurement

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