稠油低温氧化动力学实验与模型研究

Study on low-temperature oxidation experiments and kinetics model for heavy oil

注空气辅助蒸汽吞吐/蒸汽驱是稠油开发的一新工艺。针对典型稠油油样,进行了稠油-空气的低温氧化(LTO)动力学实验,研究了温度(100～150℃)和压力(8～17 MPa)对稠油-空气氧化特性的影响。基于Arrhenius方程,确定了反应的活化能、频率因子,并给出了反应焓,建立了稠油-空气低温氧化的动力学模型,为稠油油藏注空气数值模拟提供了理论基础。低温氧化实验结果表明,稠油具有很好的低温氧化活性,氧化反应速率与温度、氧气分压、原油的性质有关。在实验的温度范围内,氧化反应能有效消耗氧气,产生大量CO2。

Air injection assisted steam stimulation or steam flooding is a new technology for heavy oil ex- ploitation. For a typical heavy oil sample, the effects on heavy oil-air oxidation characteristics of tempera- ture （ 100 - 150 ℃ ） and pressure （8 - 17 MPa） were studied by heavy oil-air low temperature oxidation （LTO） kinetics experiments. Kinetic parameters such as reaction activation energy, frequency factor （pre- exponential factor） were obtained and a reaction kinetic model was built by using Arrhenius equation. LTO reaction enthalpy was also given. The determination of kinetic parameters provides a theoretical basis for numerical simulation of low temperature oxidation for air injection in heavy oil reservoirs. The results of low temperature oxidation experiments show that heavy oil has good LTO properties and LTO reaction rate is mainly related to temperature, oxygen partial pressure, and properties of crude oil. In the experimental temperature range,LTO process can effectively mount of CO2. consume oxygen and at the same time produce large amount of C02.