Nowadays, companies deal with logistics in a strategical way, in other words, instead of promptly optimize operations, focusing on the logistical procedures as mere cost drivers, supply chain companies are now looking for new solutions using logistics to gain competitiveness and also to induce new business. Thus, there is a new concept in the treatment of logistical matters: the supply chain management (SCM). One of the processes in supply chain management, the purchasing area suffered a major breakthrough in terms of research in academia. Knowledge of supplier markets, purchasing skills, searching for alternative supply sources and availability of resources for the purchasing process make the purchasing function plays strategic role increasingly strategic in companies. The objective of this research is to propose a Kraljic purchasing strategy matrix (1983) to vessels chartering on the supply chain of an oil company in Brazil. For this purpose, the peculiarities of the chartering process of this company is described and analyzed, and the contracts are positioned in the Kraljic portfolio matrix (1983). The study analyzed the current management situation of the charter processes adopted in company and applied the concepts of Kraljic study on these contracts. It was concluded that some of the company contracts are part of the leverage quadrant whereas others are part of strategic quadrant, and others of noncritical items quadrant of Kraljic matrix (1983). For each of these quadrants, possible risks and adjustment needs have been identified in the process. Thus, the study made recommendations to the company how to act in the management of these contracts considering the concepts of the current literature on the subject.