FY油藏注空气原油氧化速率影响因素的研究

Study on Influencing Factors of Oxidation Rate of Crude Oil in FY Reservoir

针对FY稠油油藏在2012年以来水平井开井数的不断增加,导致产液量和综合含水率大幅度上升,产油量不断下降,总体开发效果变差的问题,而空气泡沫驱具有与原油发生低温氧化,降低油水界面张力,能有效封堵水窜气窜,增大泡沫波及体积从而改善开发效果的作用。为了更深入研究FY区块原油与空气反应程度与流体特性、温度及压力等因素的关系,开展注空气原油氧化实验。实验表明随着温度和压力的升高,空气中的氧反应活性明显增强,FY区块的原油空气氧化速率也加快;随着反应时间延长和初始氧含量降低,原油氧化速率减慢且氧含量在10%时出现拐点。该研究结果可为后续减氧空气驱替实验研究提供理论基础,为同类油田现场提供数据和理论上的支持。

The continuous increase in the number of horizontal wells in FY reservoir since 2012 has led to a significant increase in the fluid production volume and overall moisture content, and a continuous drop in oil production, so overall development effect is poor. The air foam flooding has the effect of low-temperature oxidation with crude oil, reducing the interfacial tension between oil and water, effectively blocking the water, increasing the volume of foam penetration and improving the development effect. In order to further study the relationship between the reaction degree of crude oil and air in FY reservoir and fluid characteristics, temperature and pressure, an oxidation experiment of air and crude oil was conducted. The experiments showed that with the increase of temperature and pressure, the reactivity of oxygen was obviously enhanced, and the air oxidation rate of crude oil was also accelerated. As the reaction time was prolonged and the initial oxygen content was reduced, the oxidation rate of crude oil was slowed down. The inflection point occurred when the oxygen content was 10%. The results of this study can provide a theoretical basis for subsequent research on oxygen-reducing air displacement experiments, and provide data and theoretical support for the same fields.