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科技导报  2014 

安塞低渗透油藏回注水中悬浮颗粒堵塞规律

DOI: 10.3981/j.issn.1000-7857.2014.15.010, PP. 69-72

Keywords: 回注污水,低渗透,悬浮颗粒,粒径

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Abstract:

回注水中的悬浮颗粒能严重堵塞储层,造成渗透率下降,导致安塞油田注水难、采油难。为了提高注水效果,急需确定安塞油田合理的回注水悬浮颗粒指标。以5种不同的粒径的悬浮颗粒在3种不同浓度条件下,分别对安塞天然岩心进行室内流动实验。结果表明岩心渗透率开始随着悬浮颗粒溶液的注入缓慢下降,达到一定注入量后,能够较长时间处于某一平稳值;悬浮颗粒溶液浓度ρ>2.0mg/L,渗透率损失大于30%;ρ≤1.0mg/L且粒径d<0.730μm,渗透率损失小于30%;1.0mg/L<ρ<2.0mg/L,且d<0.730μm,渗透率损失有大于30%,也有小于30%,由浓度与粒径二者共同作用;0.730μm≤d≤2.100μm,渗透率损失大于30%。各油田回注水时,颗粒粒径范围区间应尽量小,其平均值应与储层的平均孔喉相差较大;安塞低渗透油藏注入悬浮颗粒溶液ρ<1.0mg/L,d<0.730μm。

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