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科技导报  2014 

注水中悬浮颗粒堵塞储层的影响因素分析

DOI: 10.3981/j.issn.1000-7857.2014.36.011, PP. 69-74

Keywords: 悬浮颗粒,注入量,相对浓度,匹配度,堵塞程度

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Abstract:

注入水中悬浮颗粒能够严重堵塞油藏储层,造成渗透率下降,导致注水难、采油难。开展悬浮颗粒对储层伤害规律的研究,对提高油田注水效果有着重要的指导作用。以5种不同粒径的悬浮颗粒分别在3种不同浓度溶液条件下,对天然岩心进行室内流动实验。将粒径与喉道直径之比定义为匹配度,流出液浓度与注入液浓度之比定义为相对浓度。结果表明在岩心平均喉道直径0.94μm、水测渗透率0.137×10-3~0.235×10-3μm2条件下,注入悬浮颗粒溶液后,渗透率变小,产生了堵塞。其中当匹配度小于0.777时,相对浓度大于0,即部分颗粒能够贯穿岩心,发生贯穿性堵塞;当匹配度大于0.777时,相对浓度为0,即颗粒无法贯穿岩心,发生浅部堵塞;在匹配度接近0.777时,为由贯穿性堵塞向浅部堵塞过渡阶段,堵塞最严重。注入量与堵塞程度有较好的线性关系。建议油田在达到配注量的同时,尽量减小注入水悬浮颗粒浓度,保证悬浮颗粒粒径范围集中且匹配度远离临界值。

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