过热蒸汽对提高敏感性油藏原油采收率的实验研究

Study on the Experiment of Superheated Steam to Enhance Oil Recovery for the Sensitive Reservior

通过室内单管模型进行了热水、饱和蒸汽、过热蒸汽驱油实验以及高温高压反应釜的水热裂解实验,研究了在相同温度条件下,热水、饱和蒸汽、过热蒸汽三种情况下,对提高敏感性储层驱油效率的影响。根据过热蒸汽的特性,着重分析了过热蒸汽是如何提高敏感性油藏原油采收率的,包括过热蒸汽与稠油在高温环境发生的水热裂解反应,对沥青质的转化率的影响,增大油相渗流通道,对油-水界面张力的降低,过热带的油相渗透率的增加,以及对储层水敏性的抑制。

By doing some laboratory experiments on hot water displacement, saturated steam displacement, superheated steam displacement and high temperature-pressure aquathermolysis experiment, the effect of different forms of water molecule was studied on oil displacement efficiency under the same temperature for the sensitive reservior. According to the character of superheated steam, how superheated steam to enhance oil recovery for the sensitive reservior was anlyzed, including the aquathermolysis reaction between superheated steam and heavy oil in high temperature ; the conversion of asphaltene during aquathermolysis ; enlarging pore seepage path of oil; decreasing oil-water interfacial tension force with the superheated steam; increasing in permeability to oil in superheated steam zone and inhibiting water sensitivity.