Background: Increasing competition among companies in the oil and gas industry results in a greater need for efficient processes. In Brazil, most oil operations are owned by a single company, which has a public trade structure. The company requires a large number of suppliers, including suppliers of raw materials, equipment and services. In fact, the company needs to employ experts to assist in the supplier selection process in order to be able to choose the best available alternatives. Therefore, supplier selection has been seen to have a significant impact on the success or otherwise of the company´s ventures. Objectives: This article proposes a group decision multi-criteria model for selecting suppliers for a Brazilian oil company. Method: It is proposed to use the PROMETHEE II method to obtain decision-makers’ individual evaluations and the voting procedure by quartiles so as to convert the individual positions into a position for the group. Results: An application of the model is performed to demonstrate the feasibility of the model in addressing supplier selection problems in a context with multiple stakeholders. Combining the results from the individual analysis of the PROMETHEE II method with the voting by quartiles procedure allowed individual preferences to be aggregated into a result that was representative of the group and produced a ranking of suppliers for one of the type of services used by the company. Conclusion: The results were very satisfactory, demonstrating that it is possible to apply the model to a context featuring additional decision-makers and alternatives.

中文翻译：

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基于多准则群体决策方法的巴西石油公司供应商选择模型

背景：石油和天然气行业公司之间日益激烈的竞争导致对高效流程的更大需求。在巴西，大多数石油业务由一家拥有公共贸易结构的公司所有。公司需要大量的供应商，包括原材料，设备和服务的供应商。实际上，该公司需要聘请专家来协助选择供应商，以便能够选择最佳的替代产品。因此，选择供应商对公司的成功与否有重大影响。目标：本文提出了用于选择巴西石油公司供应商的群体决策多准则模型。方法：建议使用PROMETHEE II方法通过四分位数获得决策者的个人评估和投票程序，以便将个人职位转换为该集团的职位。结果：对该模型进行了应用，以证明该模型在具有多个利益相关者的情况下解决供应商选择问题的可行性。将PROMETHEE II方法的个人分析结果与四分位数投票程序相结合，可以将个人偏好汇总为代表该组的结果，并为公司使用的一种服务类型提供了供应商排名。结论：结果非常令人满意，表明可以将模型应用于具有其他决策者和替代方案的环境。