注空气过程轻质原油低温氧化动力学

Kinetics of low temperature oxidation of light oil in air injection process

对于埋藏较深且注水困难的低渗透油藏,空气驱可作为二次采油方法。空气驱过程中地层内部分原油将和空气中的氧气发生低温氧化(LTO)反应生成烟道气(主要是N2、CO2)和油的氧化产物。通过分析轻质原油低温氧化机制,提出改进的低温氧化反应模型;采用小型台架反应器实验求取改进模型的动力学参数(Arrhenius活化能及频率因子),并利用热采数值模拟方法对氧化管(OT)实验进行历史拟合和验证,同时考察储层岩心对原油低温氧化的影响。结果表明,有储层岩心参与的反应和纯油相比具有较低的Arrhenius活化能和较高的反应频率因子。

Air injection process is an effective secondary oil recovery method for deep and light-oil reservoirs with very low permeability and poor water injection.During air injection,low temperature oxidation（LTO） may occur between a small fraction of reservoir oil and oxygen within injected air to produce flue gas（N2 and CO2） and oxygenated products.An improved LTO reaction model was established through analyzing light-oil LTO mechanisms.The kinetic parameters,in terms of the Arrhenius activation energy and reaction frequency factor,were obtained from the results of small batch reactor experiments.The improved LTO reaction model and the derived kinetic parameters were verified by history match of oxidation tube experiments using a thermal reservoir simulation model.The influence of reservoir core on LTO was investigated.The reaction with reservoir core materials has lower Arrhenius activation energy and higher frequency factor than that with oil only.