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Dynamic Optimization of a Polymer Flooding Process Based on Implicit Discrete Maximum Principle

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  • Yang Lei
  • Shurong Li
  • Xiaodong Zhang
  • Qiang Zhang
  • Lanlei Guo

Abstract

Polymer flooding is one of the most important technologies for enhanced oil recovery (EOR). In this paper, an optimal control model of distributed parameter systems (DPSs) for polymer injection strategies is established, which involves the performance index as maximum of the profit, the governing equations as the fluid flow equations of polymer flooding, and some inequality constraints as polymer concentration and injection amount limitation. The optimal control model is discretized by full implicit finite-difference method. To cope with the discrete optimal control problem (OCP), the necessary conditions for optimality are obtained through application of the calculus of variations and Pontryagin’s discrete maximum principle. A modified gradient method with new adjoint construction is proposed for the computation of optimal injection strategies. The numerical results of an example illustrate the effectiveness of the proposed method.

Suggested Citation

  • Yang Lei & Shurong Li & Xiaodong Zhang & Qiang Zhang & Lanlei Guo, 2012. "Dynamic Optimization of a Polymer Flooding Process Based on Implicit Discrete Maximum Principle," Mathematical Problems in Engineering, Hindawi, vol. 2012, pages 1-23, August.
    • Handle: RePEc:hin:jnlmpe:281567
    DOI: 10.1155/2012/281567
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