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A robust, multi-solution framework for well placement and control optimization

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Abstract

Field development and control optimization aim to maximize the economic profit of oil and gas production while considering several sources of uncertainty. This results in a high-dimensional optimization problem with a computationally demanding and uncertain objective function based on the simulated reservoir model. The limitations of many current robust optimization methods are: 1) it is single-level optimization (e.g. optimization of well locations/placement only; or of well production/injection control variables only) that ignores interference between the control variables from different levels; and 2) they provide a single optimal solution, whereas operational problems often add unexpected constraints likely to reduce that optimal, inflexible solution to a sub-optimal scenario. This paper presents a robust, multi-solution framework based on sequential iterative optimization of control variables at multiple levels using the Simultaneous Perturbation Stochastic Approximation (SPSA) optimization algorithm. A systematic realization selection process, tailored to the objective of the subsequent optimization stage, is used to select a small representative ensemble of reservoir model realizations to be used for calculating the expected objective value. The estimated gradients are calculated using a 1:1 ratio mapping ensemble of control variables perturbations at each iteration onto the ensemble of selected reservoir model realizations to reduce the computational cost. An ensemble of close-to-optimum solutions is then chosen from each level (e.g. from the well placement optimization level) and transferred to the next level of optimization (e.g. where the control settings are optimized), and this loop continues until no significant improvement is observed in the expected objective value. Fit-for-purpose clustering techniques are developed to systematically select an ensemble of solutions, with maximum differences in control variables but close-to-optimum objective values, at each optimization level. The proposed framework has been tested on a benchmark case study (Brugge field). Multiple solutions are obtained with different well locations and control settings but close-to-optimum objective values. We show that suboptimal solutions from an early optimization level can approach and even outdo the optimal one at the next level(s). Results demonstrate the advantage of the developed framework in more efficient exploration of the search space and providing the much-needed operational flexibility to field operators.

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Acknowledgments

Authors are thankful to the sponsors of the “Value from Advanced Wells II” Joint Industry Project at Heriot-Watt University for providing financial support and Schlumberger for allowing academic access to their software.

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Authors and Affiliations

  1. Institute of GeoEnergy Engineering, Heriot-Watt University, Edinburgh, EH14 4AS, UK

    Mohammad Salehian, Morteza Haghighat Sefat & Khafiz Muradov

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  1. Mohammad Salehian
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  2. Morteza Haghighat Sefat
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  3. Khafiz Muradov
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Correspondence to Mohammad Salehian.

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Salehian, M., Sefat, M.H. & Muradov, K. A robust, multi-solution framework for well placement and control optimization. Comput Geosci 26, 897–914 (2022). https://doi.org/10.1007/s10596-021-10099-2

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