A Study on the Characteristics and Mechanism of Air Displacement of Deoxygenated Air in Tazhong Deep Heavy Oil
Static oxidation experiments were carried out for the Tazhong deep heavy oil reservoir,the composition of oil and gas produced with different oxygen content and different oxidation times was analyzed,and the oxidation characteristics,oxidation pathways and oxidation mechanisms of crude oil and deoxygenated air in the process of deoxygenated air injection in the reservoir were studied.The experimental results showed that the oxygen consumption rate of crude oil was positively correlated with the oxygen content of oxygen-reduced air and negatively correlated with the oxidation time.The amount of generated carbon dioxide also increased with the increase of oxidation time and oxygen content of oxygen-reduced air.The reaction between crude oil and oxygen-reduced air can increase the viscosity of crude oil to a certain extent.The increase amplitude of viscosity was greater with higher oxygen content of oxygen-reduced air and longer oxidation time.After oxidation,the content of saturated hydrocarbons and aromatic hydrocarbons in crude oil decreased,while the content of resin and asphaltene increased,especially asphaltene.The C=O stretching vibration peak appeared in the crude oil after oxidation,and the vibration peak became stronger with the increase of oxygen content in oxygen-reduced air,indicating that the oxidation process of crude oil involved oxygenation reactions to generate substances such as aldehydes.With the increase of oxygen content,the oxidation reaction deepened continuously.
crude oil oxidationoxygen-reduced airoxygenation reactiongroup Ⅳ componentslow temperature oxidation
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