We study the effects of pressure on crude-oil oxidation kinetics using ramped temperature oxidation for a large range of pressures and heating rates (1.5, 2.0, 5.0, 7.5, 8.0, 10.0, 15.0, 20.0, and 30.0 °C/min). Results are relevant to the combustion of crude oil within reservoirs to produce heat and pressure that enhance oil recovery. Our study results suggest that the activation energy of global reactions is sensibly independent of changes in both partial pressure and total pressure (100–2000 psig) with values ranging between 50 and 60 kJ/mol for the low-temperature oxidation regime (roughly 250 °C) and 90–100 kJ/mol for the high-temperature oxidation regime (roughly 350–450 °C). Three different crude oils were tested. For one of the crude oils, we observe an increasing trend in oxygen consumption as the total pressure is increased up to a particular pressure (∼500 psig), after which it remains constant. This trend is, apparently, associated with the evaporation of relatively lighter components at low pressures, decreasing the amount of oil available for fuel generation. Total oxygen consumption starts to decrease again at very large pressures (>1500 psig), and we associate this trend with water phase behavior at these conditions.

中文翻译：

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压力对原位燃烧过程中原油动力学的影响

我们研究了在大范围的压力和加热速率（1.5、2.0、5.0、7.5、8.0、10.0、15.0、20.0和30.0°C / min）下，使用渐变温度氧化对压力对原油氧化动力学的影响。结果与储层内原油的燃烧有关，从而产生热量和压力，从而提高了石油采收率。我们的研究结果表明，全局反应的活化能与分压和总压（100-2000 psig）的变化明显地无关，在低温氧化条件下（大约250°C），其范围在50至60 kJ / mol之间。 C）和90–100 kJ / mol的高温氧化方式（大约350–450°C）。测试了三种不同的原油。对于其中一种原油，我们观察到，随着总压力增加到特定压力（〜500 psig），氧气消耗量呈上升趋势，此后保持恒定。显然，这种趋势与低压下相对较轻的组分的蒸发有关，从而减少了可用于燃料生产的油量。在非常大的压力（> 1500 psig）下，总耗氧量再次开始下降，我们将这种趋势与这些条件下的水相行为联系起来。