Γ-opt Research Group
Γ-opt Research Group
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Production and operations planning
Predicer: abstract stochastic optimisation model framework for multi-market operation
An open-source modelling framework Predicer, standing for Predictive Decider, for multi-market day-ahead market operation purposes is …
Esa Pursiheimo
,
Dennis Sundell
,
Juha Kiviluoma
,
Helmi Hankimaa
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A data-driven optimization model for the workover rig scheduling problem: Case study in an oil company
After completion, oil wells often require intervention services to increase productivity, correct oil flow losses, and solve mechanical …
Iuri Santos
,
Silvio Hamacher
,
Fabricio Oliveira
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The p-Lagrangian relaxation for separable nonconvex MIQCQP problems
This paper presents a novel technique to compute Lagrangian bounds for nonconvex mixed-integer quadratically constrained quadratic …
Tiago Andrade
,
Nikita Belyak
,
Andrew Eberhard
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Silvio Hamacher
,
Fabricio Oliveira
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A Systematic Literature review for the rig scheduling problem: Classification and state-of-the-art
Rigs are critical capital-intensive resources for oil and gas exploration and production operations, such as drilling, completion, and …
Iuri Santos
,
Silvio Hamacher
,
Fabricio Oliveira
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Efficient formulation for transportation scheduling of single refinery multiproduct pipelines
Multiproduct pipeline transportation scheduling is a complex operations research problem that is characterized by the movement of the …
Hossein Mostafaei
,
Pedro M. Castro
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Fabricio Oliveira
,
Iiro Harjunkoski
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A practical assessment of risk-averse approaches in production lot-sizing problems
This paper presents an empirical assessment of four state-of-the-art risk-averse approaches to deal with the capacitated lot-sizing …
Douglas Alem
,
Fabricio Oliveira
,
Miguel Carrión Ruiz Peinado
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Optimizing Workover Rig Fleet Sizing and Scheduling Using Deterministic and Stochastic Programming Models
We present deterministic and stochastic programming models for the workover rig problem, one of the most challenging problems in the …
Miguel Fernández Pérez
,
Fabricio Oliveira
,
Silvio Hamacher
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Periodic review system for inventory replenishment control for a two-echelon logistics network under demand uncertainty: a two-stage stochastic programming approach
We propose a novel methodology for replenishment and control systems for inventories of two-echelon logistics networks using a …
Paulo Cunha
,
Fabricio Oliveira
,
Fernanda Raupp
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A two-stage stochastic programming model for periodic replenishment control system under demand uncertainty
The inventory control system consists of defining strategies to manage inventory replenishment such that costs involved in ordering, …
Paulo Cunha
,
Fernanda Raupp
,
Fabricio Oliveira
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A new mathematical model for the workover rig scheduling problem
One of the most important activities in the oil and gas industry is the intervention in wells for maintenance services, which is …
Miguel Pérez
,
Fabricio Oliveira
,
Silvio Hamacher
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