Schlumberger

Geomechanics in Completion & Production

Manage geomechanical effects

Deepwater projects require completion design technologies to address specific challenges in environments associated with high rig-time costs. Decreasing nonproductive time results in an increased field reliability timeframe. Completions must therefore be designed to minimize or eliminate the need for interventions during the life of the well.

Geomechanical effects on completions design, perforating or fracturing, and formation stability during production can have a significant impact on long-term reservoir behavior and require a comprehensive assessment in the planning stage.

Casing integrity

It is important for the security and long-term integrity of a well that the casing and cement sheath are able to support the formation loading. This loading can change, often by increasing both in the reservoir and overburden, in response to production. This increased loading can pinch, and, in some cases, shear the casing.

Perforation optimization

An optimized perforating design needs to maximize production performance, 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. Penetration depth and entrance hole diameter are estimated using overburden stresses (evaluated using density logs), in situ stresses, and pore pressure analyses. Near wellbore alterations are characterized by differences between far-field and near-wellbore sonic slowness.

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