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Shi, S. (author), Cheng, Xiaodong (author), De Schutter, B.H.K. (author), Van den Hof, Paul M.J. (author)In a dynamic network of interconnected transfer functions, it is not necessary to use all the node signals for estimating a local transfer function. Given the network topology, detailed conditions are available for selecting inputs and outputs in a (MIMO) predictor model that warrants consistent and minimum variance estimation of a target...journal article 2023
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Shi, S. (author), Cheng, Xiaodong (author), Van den Hof, Paul M.J. (author)Identifiability of a single module in a network of transfer functions is determined by whether a particular transfer function in the network can be uniquely distinguished within a network model set, on the basis of data. Whereas previous research has focused on the situations that all network signals are either excited or measured, we develop...journal article 2023
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Dreef, H. J. (author), Shi, S. (author), Cheng, X. (author), Donkers, M. C.F. (author), Van den Hof, P. M.J. (author)Identifiability of linear dynamic networks requires the presence of a sufficient number of external excitation signals. The problem of allocating a minimal number of external signals for guaranteeing generic network identifiability in the full measurement case has been recently addressed in the literature. Here we will extend that work by...journal article 2022
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Ramaswamy, K. R. (author), Fonseca, R. M. (author), Leeuwenburgh, O. (author), Siraj, M.M. (author), Van den Hof, P.M.J. (author)We are concerned with the efficiency of stochastic gradient estimation methods for large-scale nonlinear optimization in the presence of uncertainty. These methods aim to estimate an approximate gradient from a limited number of random input vector samples and corresponding objective function values. Ensemble methods usually employ Gaussian...journal article 2020
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Siraj, M. Mohsin (author), Saltik, M. Bahadir (author), Van den Hof, Paul M.J. (author), Grammatico, S. (author)Model-based optimization of the water-flooding process in oil reservoirs suffers from high levels of uncertainty arising from strongly varying economic conditions and limited knowledge of the reservoir model parameters. To handle uncertainty, diverse robust optimization approaches that use an ensemble of uncertain parameter realizations (i.e....journal article 2018
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Goncalves Dias De Barros, E. (author), Yap, F.K. (author), Insuasty, E (author), Van den Hof, PMJ (author), Jansen, J.D. (author)Closed-loop reservoir management (CLRM) is a combination of life-cycle optimization and computerassisted history matching. The application of the CLRM framework to real field cases can be computationally demanding. An even higher computational load results from procedures to assess the value of information (VOI) in CLRM. Such procedures, which...conference paper 2016
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Barros, E.G.D. (author), Van den Hof, P.M.J. (author), Jansen, J.D. (author)This paper proposes a new methodology to perform value of information (VOI) analysis within a closed-loop reservoir management (CLRM) framework. The workflow combines tools such as robust optimization and history matching in an environment of uncertainty characterization. The approach is illustrated with two simple examples: an analytical...journal article 2015
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Jansen, J.D. (author), Fonseca, R.M. (author), Kahrobaei, S. (author), Siraj, M.M. (author), Van Essen, G.M. (author), Van den Hof, P.M.J. (author)The ‘Egg Model’ is a synthetic reservoir model consisting of an ensemble of 101 relatively small three-dimensional realizations of a channelized oil reservoir produced under water flooding conditions with eight water injectors and four oil producers. It has been used in numerous publications to demonstrate a variety of aspects related to...journal article 2014
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Barros, E.G.D. (author), Jansen, J.D. (author), Van den Hof, P.M.J. (author)This paper proposes a new methodology to perform value of information (VOI) analysis within a closed-loop reservoir management (CLRM) framework. The workflow combines tools such as robust optimization and history matching in an environment of uncertainty characterization. The approach is illustrated with two simple examples: an analytical...conference paper 2014
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Kahrobaei, S. (author), Mansoori, M. (author), Joosten, G.J.P. (author), Van den Hof, P.M.J. (author), Jansen, J.D. (author)It is well known that parameter updating of large-scale numerical reservoir flow models (a.k.a. ‘computer assisted history matching’) is an ill-posed inverse problem. Typically the number of uncertain parameters in a reservoir flow model is very large whereas the available information for estimating these parameters is limited. The classic...conference paper 2014
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Fonseca, R.M. (author), Stordahl, A. (author), Leeuwenburgh, O. (author), Van den Hof, P.M.J. (author), Jansen, J.D. (author)We consider robust ensemble-based multi-objective optimization using a hierarchical switching algorithm for combined long-term and short term water flooding optimization. We apply a modified formulation of the ensemble gradient which results in improved performance compared to earlier formulations. We also apply multi-dimensional scaling to...conference paper 2014
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Fonseca, R.M. (author), Leeuwenburgh, O. (author), Van den Hof, P.M.J. (author), Jansen, J.D. (author)In an earlier study two hierarchical multi-objective methods were suggested to include short-term targets in life-cycle production optimization. However this earlier study has two limitations: 1) the adjoint formulation is used to obtain gradient information, requiring simulator source code access and an extensive implementation effort, and 2)...journal article 2014
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Jansen, J.D. (author), Fonseca, R.M. (author), Kahrobaei, S. (author), Siraj, M. (author), Van Essen, G.M. (author), Van den Hof, P.M.J. (author)The "Egg Model" is a synthetic reservoir model consisting of an ensemble of 101 relatively small three-dimensional realizations of a channelized reservoir produced under water flooding conditions with eight water injectors and four producers. It has been used in numerous publications to demonstrate a variety of aspects related to computer...report 2013
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Van Doren, J.F.M. (author), Van den Hof, P.M.J. (author), Bosgra, O.H. (author), Jansen, J.D. (author)Reservoir simulation models are frequently used to make decisions on well locations, recovery optimization strategies etc. The success of these applications is, among other aspects, determined by the controllability and observability properties of the reservoir model. In this paper it is shown how the controllability and observability of two...journal article 2013
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Van Essen, G.M. (author), Van den Hof, P.M.J. (author), Jansen, J.D. (author)In oil production waterflooding is a popular recovery technology, which involves the injection of water into an oil reservoir. Studies on model-based dynamic optimization of waterflooding strategies have demonstrated that there is a signifcant potential to increase life-cycle performance, measured in Net Present Value. However, in these studies...conference paper 2010
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Van den Hof, P.M.J. (author), Jansen, J.D. (author), Van Essen, G.M. (author), Bosgra, O.H. (author)Due to urgent needs to increase efficiency in oil recovery from subsurface reservoirs new technology is developed that allows more detailed sensing and actuation of multiphase flow properties in oil reservoirs. One of the examples is the controlled injection of water through injection wells with the purpose to displace the oil in an appropriate...conference paper 2009
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Zandvliet, M.J. (author), Van Doren, J.F.M. (author), Bosgra, O.H. (author), Jansen, J.D. (author), Van den Hof, P.M.J. (author)Over the past few years, more and more systems and control concepts have been applied in reservoir engineering, such as optimal control, Kalman filtering, and model reduction. The success of these applications is determined by the controllability, observability, and identifiability properties of the reservoir at hand. The first contribution of...journal article 2008
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- Van Essen, G.M. (author), Zandvliet, M.J. (author), Van den Hof, P.M.J. (author), Bosgra, O.H. (author), Jansen, J.D. (author) conference paper 2006
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- de Callafon, R.A. (author), Van den Hof, P.M.J. (author) journal article 2001
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- Van den Hof, P.M.J. (author) public lecture 2000
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