1887

Abstract

Summary

A Derivative-Free Trust-Region (DFTR) algorithm is proposed to solve for the well control optimization problem. Derivative-Free (DF) methods are often a practical alternative because gradients may not be available and/or are unreliable due to cost function discontinuities, e.g., caused by enforcement of simulation-based constraints. However, the effectiveness of DF methods for solving realistic cases is heavily dependent on an efficient sampling strategy since cost function calculations often involve time-consuming reservoir simulations. The DFTR algorithm samples the cost function space around an incumbent solution and builds a quadratic approximation model, valid within a bounded region (the trust-region). A minimization of the quadratic model guides the method in its search for descent. Crucially, because of the curvature information provided by the model-based routine, the trust-region approach is able to conduct a more efficient search compared to other sampling methods, e.g., direct-search approaches.

DFTR is implemented within FieldOpt, an open-source framework for field development optimization that provides flexibility with respect to problem parameterization and parallelization capabilities. DFTR is tested in the synthetic case Olympus against two other type of methods commonly applied to production optimization: a direct-search (Asynchronous Parallel Pattern Search) and a population-based (Particle Swarm Optimization). Current results show DFTR has promising convergence properties. In particular, the method is seen to reach fairly good solutions using only a few iterations. This feature can be particularly attractive for practitioners who seek ways to improve production strategies while using full-fledged models. Future work will focus on wider application of the algorithm in more complex field development problems such as joint problems and ICD optimization, and extensions to the algorithm to deal with multiple geological realizations and output constraints.

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/content/papers/10.3997/2214-4609.202035086
2020-09-14
2024-04-24
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