In general, sand production in oil/gas reservoirs in weak formations has an adverse impact on production costs. For efficient reservoir management, predictive tools are needed to quantitatively mitigate and control sand production. A fully coupled sand production model that integrates geomechanics and fluid flow was developed to quantify volumetric sand production during the early drawdown period (a few days), bean-up, as well as in the depletion period (a number of years).

First, we compared simulation results from the proposed model to sand production data from full-scale laboratory perforation sanding tests for model verification. Then, we employed the developed model to evaluate the key variables that govern volumetric sand production. This study indicates that sand production in weak reservoirs is influenced by a number of variables. These include rock strength, flow rate, oil viscosity, and producing time. The simulation results relating cumulative sand production and sand production rate to these important variables are presented. Descriptions of the volumetric sand production model (formulations, constitutive equations, solutions procedures) are also presented.

The study suggests that the proposed model may be used to generate quantitative information for predicting volumetric sand production. This provides a tool for sand-management in exploiting the weakness of sanding-prone scenarios.

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