自燃点火过程中稠油低温氧化特征及影响因素实验研究
发布时间：2018-10-20 15:26
【摘要】：目前我国稠油油藏(新疆、辽河)已经进入火驱先导试验阶段,在注蒸汽升温的基础上开展预注空气技术,但由于各开发区块的油层温度相对较低,要使油藏达到自燃点火就需要人为抬升储层温度,而不同稠油藏其原始含水饱和度不同,且粘土矿物含量随机分布,为了加速稠油与氧气的反应速率,外界干预作用效果不显著,成本高,工艺复杂。因此,研究含水饱和度和粘土矿物对稠油低温氧化速率及氧化反应时升温速率变化影响有十分重要的现实意义和经济意义。本文通过室内静态模拟实验对影响低温氧化速率及升温速率的因素进行了系统的研究。采用高温高压反应釜进行了不同含水饱和度对稠油低温氧化速率及升温速率影响实验研究,其结果表明,30%含水饱和度对稠油低温氧化升温速率起到了促进作用,CO2和CO气体量随含水饱和度的增加而减小;采用正交试验分析法确定出能够增大低温氧化升温速率且稠油流动性提升的最佳工艺条件为高空气油比-含水饱和度为30%-温度为180℃,因素作用的主次顺序为空气油比、含水饱和度、温度;采用高温高压反应釜进行了不同类型粘土矿物及其浓度对稠油低温氧化升温速率影响实验研究,其结果表明,稠油在含蒙脱石的多孔介质中升温速率及氧化速率和碳键剥离反应速率明显提高,各种粘土矿物的催化能力为:蒙脱石绿泥石高岭石;采用正交试验分析法确定出稠油低温氧化过程中因素作用的主次顺序为蒙脱石、温度和空气油比,蒙脱石含量高的稠油藏实施预注空气时的最佳工艺条件为油藏温度升至为180℃,粘土矿物浓度为15%,高注气量条件下进行。
[Abstract]:At present, heavy oil reservoirs in China (Xinjiang, Liaohe) have entered the pilot stage of fire drive, and preinjected air technology has been developed on the basis of steam injection heating, but the reservoir temperature in each development block is relatively low. In order to make the reservoir achieve spontaneous ignition, it is necessary to raise the reservoir temperature artificially, and different heavy oil reservoirs have different original water saturation and random distribution of clay mineral content. In order to accelerate the reaction rate between heavy oil and oxygen, The effect of external intervention is not significant, the cost is high, and the process is complex. Therefore, it is of great practical and economic significance to study the effects of water saturation and clay minerals on the low temperature oxidation rate of heavy oil and the change of temperature rise rate during oxidation reaction. In this paper, the influence factors of low temperature oxidation rate and temperature rise rate are systematically studied by indoor static simulation experiment. The effect of different water saturation on low temperature oxidation rate and heating rate of heavy oil was studied by using high temperature and high pressure reactor. The results show that 30% water saturation promotes the temperature rise rate of low temperature oxidation of heavy oil, and the gas volumes of CO2 and CO decrease with the increase of water saturation. The orthogonal test method was used to determine the optimum process conditions for increasing the temperature rise rate of low temperature oxidation and enhancing the flow of heavy oil. The optimum technological conditions were as follows: high air / oil ratio, water saturation and temperature were 30 鈩，
本文编号：2283568
[Abstract]:At present, heavy oil reservoirs in China (Xinjiang, Liaohe) have entered the pilot stage of fire drive, and preinjected air technology has been developed on the basis of steam injection heating, but the reservoir temperature in each development block is relatively low. In order to make the reservoir achieve spontaneous ignition, it is necessary to raise the reservoir temperature artificially, and different heavy oil reservoirs have different original water saturation and random distribution of clay mineral content. In order to accelerate the reaction rate between heavy oil and oxygen, The effect of external intervention is not significant, the cost is high, and the process is complex. Therefore, it is of great practical and economic significance to study the effects of water saturation and clay minerals on the low temperature oxidation rate of heavy oil and the change of temperature rise rate during oxidation reaction. In this paper, the influence factors of low temperature oxidation rate and temperature rise rate are systematically studied by indoor static simulation experiment. The effect of different water saturation on low temperature oxidation rate and heating rate of heavy oil was studied by using high temperature and high pressure reactor. The results show that 30% water saturation promotes the temperature rise rate of low temperature oxidation of heavy oil, and the gas volumes of CO2 and CO decrease with the increase of water saturation. The orthogonal test method was used to determine the optimum process conditions for increasing the temperature rise rate of low temperature oxidation and enhancing the flow of heavy oil. The optimum technological conditions were as follows: high air / oil ratio, water saturation and temperature were 30 鈩，
本文编号：2283568
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