摘要
为改善普通稠油油藏蒸汽吞吐开发效果,利用热采比例物理模型和地层原油高压物性分析等设备,在室内开展了注空气辅助蒸汽吞吐实验研究。实验结果表明:溶解空气后的原油体积系数增大、黏度降低,原油的气体溶解能力随压力增加而增大;空气中的氧气与原油发生低温氧化反应放出热量,并且温度和压力越高,放热量越大。未反应的N2及生成的CO2等烟气起到增压助排、扩大蒸汽波及体积、提高热效率等作用,改善了蒸汽吞吐的开采效果;低温氧化反应后原油的轻质组分减少、重质组分增加,黏度有增大趋势,但高温条件下对空气辅助蒸汽吞吐的开采效果影响不大。与常规蒸汽吞吐方式相比,空气辅助蒸汽吞吐方式可提高周期油汽比、回采水率和采出程度。
In order to improve the development effect of steam stimulation in common heavy oil reservoirs,laboratory experiments of air injection assisted steam stimulation were carried out by using thermal recovery proportional physical model and high pressure crude oil physical property analysis equipment. The results show that the volume coefficient of heavy oil increases,the viscosity deceases after air is dissolved into the crude oil,and the air dissolution capacity of crude oil increases with the increase of pressure. The low temperature oxidation between air and crude oil releases heat,and the higher the temperature and pressure,the greater the heat release. The N2 in the air and the exhaust gases produced by the low temperature oxidation such as CO2 can improve the effect of steam stimulation by increasing formation pressure,expanding steam sweep volume and improving thermal efficiency. The light components of the crude oil decrease and the heavy components increase after low temperature oxidation reaction,which will increase the viscosity of the crude oil,but has little effect on the recovery of air-assisted steam stimulation under high temperature conditions. Compared with the conventional steam stimulation,the air-assisted steam stimulation could improve the ratio of oil to stream,the water content of produced liquid and the recovery percent of reserves.
引文
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