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利用原油氧化釜及火烧驱油装置进行实验,研究了温度对原油燃烧的影响和不同的燃烧方式、水气比条件下的火驱前缘特征及驱油特征。研究实验结果认为,原油低温氧化与高温燃烧之间的临界温度为380～450℃;两个阶段的特征可用产出气体中CO2与O2的含量来反映,低温氧化时CO2含量低于6%,O2利用率低于75%～80%,高温燃烧时CO2含量高于12%,O2利用率接近100%。与干式燃烧相比,湿式燃烧不仅提前了产油的见效时间,而且提高了平均产油速率,表明火烧前缘下游的蒸汽带对驱油有非常重要的作用,既可减少燃烧带的宽度和燃烧峰值温度,从而降低空气耗量和空气油比,又能提高驱油效率。实验表明,合理的水气比(以标准状态下的气体积计)应为1.65kg/m3左右。图4表2参3(王艳辉摘)
Experiments were carried out using crude oil oxidation reactor and fire flooding unit to study the effects of temperature on the combustion of crude oil and different combustion modes. The characteristics of the front of the fire flooding and the characteristics of oil displacement were studied. The experimental results show that the critical temperature between low temperature oxidation and high temperature combustion of crude oil is 380 ~ 450 ℃. The characteristics of the two phases can be reflected by the content of CO2 and O2 in the produced gas. The content of CO2 in the low temperature oxidation is less than 6% O2 utilization is less than 75% to 80%, CO2 content is higher than 12% at high temperature combustion, and O2 utilization is close to 100%. Compared with dry combustion, wet combustion not only advances the effective time of oil production but also increases the average oil production rate, indicating that the steam band downstream of the fire front plays a very important role in oil displacement, which can reduce the width of the combustion band And combustion peak temperature, thereby reducing the air consumption and air-oil ratio, but also improve the displacement efficiency. Experiments show that a reasonable water vapor ratio (gas volume under standard conditions) should be about 1.65kg / m3. Figure 4 Table 2 Reference 3 (Wang Yanhui Abstract)