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注空气低温氧化开采轻质油气藏技术是一项提高采收率的新技术。注空气具有气源丰富、成本低的优点，近年来注空气低温氧化技术越来越受到人们的关注。文章针对某轻质油藏进行了注空气低温氧化过程模拟，考察了驱替过程中油层温度、含氧剖面、产出气体组成、气体对轻质组分抽提、原油密度等的变化情况，由此认识到该轻质油藏可以进行注空气低温氧化采油。驱替过程中存在机理包括：热效应不是此油藏提高采收率的主要因素，其升温速率仅为0.0017℃/min，不足以使油层温度急剧上升；氧气在油层中被消耗，生成了CO₂，采出气中CO₂含量高达8％,注空气过程实现了间接的烟道气驱；气体对原油产生了抽提作用，表现出烟道气驱的特征；由于烟道气的溶解，原油密度降低；当注入1.2PV空气时，该油藏获得了63.17％的原油采收率，注入0.8PV后，增产效果已不明显，可转为注其他物质。

Research on the Mechanisms of Enhancing Recovery of Light-oil Reservoir by Air-injected Low-temperature Oxidation Technique

The air injected low temperature oxidation technique of exploiting light oil reservoir is a novel creative technique of enhancing recovery. Air injection is of these advantages as abundant air source and low cost and the air injected low temperature oxidation technique has been followed with interest more and more in recent years. A simulation of the air injected low temperature oxidation process was carried out for one light oil reservoir and through examining the changes in oil bearing formation temperature, oxygen bearing profile, produced gas constituent, gas extracted light component and crude oil density, etc., in the process of displacement, it was thought that the air injected low temperature oxidation technique may be used for exploiting such a light oil reservoir. The mechanisms occurring to the process of displacement include these, i.e. the thermal effect was not the main factor of enhancing recovery of the reservoir and its temperature rising rate was not enough to make the oil bearing formation temperature’s increasing rapidly, only being 0.0017℃/min only; because the oxygen was consumed to form CO2, the CO2 content was up to 8％ in the produced gas; an indirect flue gas drive was realized in the process of air injection; the crude oil was extracted by gas, which shows a character of flue gas drive; the crude oil density was reduced because of the flue gas’ being dissolved in; and when the air of 1.2 PV was injected, the crude oil recovery of 63.17％ was obtained for the reservoir, however, after that of 0.8 PV was injected, the effectiveness of increasing productivity was unnoticeable, the other matters being able to be used for injection.