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科技导报  2015 

特/超低渗透油藏不同气驱方式物理模拟

DOI: 10.3981/j.issn.1000-7857.2015.22.003, PP. 27-31

Keywords: CO2驱油,微观驱油机制,可动流体,超低渗透油藏,核磁共振

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Abstract:

选取大庆外围特/超低渗透储层岩心进行物理模拟实验,结合核磁共振,通过注水转注气、CO2混相驱、CO2非混相驱和周期注气4种驱替方式,研究不同渗透率级别岩心的驱油效率和剩余油分布,以此对大庆现场注CO2先导实验区开发提供参考意见。结果表明,在相同条件下,常规注水开发的效果最差,但转注气后能有较大的提升;对于特低渗岩心,周期注气的驱油效率最高;对于超低渗岩心,注水转注气的效果高于其他3种方式。剩余油分布研究表明,注水转注气、CO2混相驱和CO2非混相驱3种方式动用的主要是大-中孔隙中的油,对于黏土微孔隙中的原油很难进行动用,但是通过周期注气过程中的停注时间,在毛管力和弹性能的作用下,微孔隙中的原油向中-大孔隙中流动,从而增加小孔隙中难动用的原油的动用程度。

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