The final goal in a perforation operation is achieving the maximum production and reducing perforation damage, using optimal completion process. The Dynamic Underbalanced Perforation (DUP) as one of the more recent completion technologies minimizes or even eliminates the perforation crushed zone by optimizing the well's dynamic underbalance. Dynamic underbalance is a transient underbalance process that occurs immediately after creation of the perforation tunnels. The modeling of this process is essential in designing the optimal configuration of the perforation charges to evaluate the perforation efficiency.

In this study we propose a novel and efficient numerical method, to optimize the completion efficiency which is rarely attended in the literature. There are five main steps in our modeling procedure:

  1. Calculating volume of the gas released in detonation,

  2. Calculating inner temperature of the Gun,

  3. Calculating remaining gas and energy amount inside the gun,

  4. Calculating pressure and casing stability analysis, and finally

  5. Calculating perforation skin.

Although there are some computer programs that claim to model the DUP technology, none of them uses a fully numerical method. In fact, all of these programs use experimental data and correlations to predict the efficiency of this process.

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