Recuperação de reservatório por injeção de dióxido de carbono: análise de estudo de casos

Abstract

During the life oil wells, production process usually passes three stages. The first stage of production is the primary recovery where uses the natural source of energy. The second stage is the so-called secondary recovery, where the main purpose is to maintain the reservoir pressure by fluid injection. The rise in world oil prices has encouraged the producers to use the new technical developments. The third stage is called Enhanced oil recovery (EOR) which is a collection of sophisticated methods, to extract the most oil from a reservoir. EOR can be divided into three major types of techniques: termal, miscible and chemical recovery. Among miscible techniques is the gas flooding, where gas is generally injected single or intermittently with water. Carbon dioxide and nitrogen gases have only limited application as agents of a miscible displacement in deep and high pressure reservoirs. The present work has the objective of analyzing two case studies of EOR where the main parameters that involve the advanced recovery engineering in the production of oil by CO2 injection will be evaluated. The main parameters evaluated were: relative permeability, recovery factor, mobility, wettability, sweeping efficiency, displacement efficiency, showing the behavior of each of them and showing that the CO2 injection EOR method is quite effective.