Schlumberger

Perforation Optimization

Use formation stresses to your advantage for perforating design

Optimal well completion, with improved production, requires identification and estimation of the radial extent of alteration in reservoir intervals. It is important to identify mechanically competent intervals as well as those showing radial alteration by using sonic data and borehole image logs. At the same time the orientation of the earth stresses influence stability of the perforation. Identifying and shooting perforations in the best orientation can significantly improve production and ultimate field recovery.

Develop a geomechanically appropriate perforating design

Near wellbore alterations are characterized by differences between the far-field and near-wellbore sonic slownesses. Outputs from radial profiling based on compressional and shear sonic data help in optimal depth interval selection and perforation tunnel design.

An optimized perforating design calls for perforations that not only maximize production performance but also ensure stability and avoid sanding. Perforation orientation, in the context of the prevailing stress field, as well as drawdown rates, determines a perforation tunnel’s long-term integrity.

Geomechanical parameters are used to design and simulate the behavior of perforation charges on the rock matrix. Overburden stresses (evaluated using density logs), in-situ stresses and pore pressure are used to estimate penetration depth and entrance hole diameter.

The radial extent of mechanically altered intervals can be detected by sonic and borehole images to isolate these weaker zones from production.

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The Sonic Scanner tool imageperforations and stimulated fractures
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