The Schlumberger Perforating Analysis (SPAN Rock) software is used to model perforating performance in reservoir rocks. SPAN Rock allows the user to optimize the well completion efficiency by comparing a variety of gun/charge configurations under different reservoir conditions. SPAN Rock guides the user through a logical path to the best perforating design. The SPAN Rock approach is simple yet detailed. Casing, cement, and formation information is combined with wellbore geometry and completion fluid characteristics. This information is matched with the gun system’s performance characteristics and positioning data to predict perforating performance under the specified conditions. SPAN Rock users can match well parameters with available perforating gun systems to create a customized well development plan.

The SPAN Rock program generates Penetration, Productivity Analysis and Dynamic Underbalance reports for up to six perforating systems in a format that is easy to understand and use. Formation penetration characteristics for charges are estimated by a novel model that was developed with rigorous laboratory tests for each individual charge in various rocks, and under downhole conditions rather than resulting from surface concrete results.

In calculating productivity, perforation skin is derived from state-of-the-art semi-analytical correlations that are developed through extensive 3-D finite element simulations and laboratory experiments with advanced perforating test facilities at the Schlumberger Rosharon Campus (SRC). Sensitivity, Static and Dynamic Underbalance plots show the effect of productivity and charge performance as a function of one or more parameters. To aid in the selection process, SPAN Rock can model several combinations of formation, well, and perforating gun and charges.

SPAN Rock also has the option to compute perforating performance (Penetration and Skin) along the wellbore. SPAN Rock outputs include a Gun String Summary Report and a SPAN Rock Perforating Log plot which provide a visual representation of the perforating performance along the length of the wellbore.

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