【摘要】 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 .0 0 17℃ /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 6 3.17%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。更多还原

【Abstract】 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 CO 2, the CO 2 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.更多还原