水包油乳液型复合泥饼清除剂的室内研究

发布时间：2018-08-25 17:40

【摘要】：针对裂缝性致密砂岩储层存在的高密度油基钻井液固相颗粒侵入以及泥饼难以清除等问题,开发出一种高效率、抗高温、低成本的水包油型复合泥饼清除剂。复合泥饼清除剂由混合酸、抗高温渗透剂、清洗剂、乳化剂等组成。通过对复合泥饼清除剂——水包油型乳液体系以及新型泥饼清除剂——纳米乳液体系的对比研究分析表明,在洗油方面以及溶蚀泥饼结构方面,复合泥饼清除剂效果优于纳米乳液。该复合泥饼清除剂的稳定性能强,抗温可达120℃;在静态条件下泥饼清除率可以达到90%以上,在动态条件下清除后岩心渗透率恢复值可以达到89%,最佳作业时间为8 h。在目前求降本增效的形势下,该复合泥饼清除剂剂配方简单,性能优良,解堵时间较短,能够有效改善和提高岩心渗透率恢复值。
[Abstract]:In view of the problems of high density oil-base drilling fluid solid particle intrusion and difficult to clear mud cake in fractured tight sandstone reservoir, a high efficiency, high temperature and low cost oil-in-water compound mud cake scavenger was developed. The compound mud cake scavenger consists of mixed acid, high-temperature permeable agent, cleaning agent, emulsifier and so on. The comparison and analysis of the composite mud cake scavenger water in oil emulsion system and the new mud cake scavenger nano emulsion system show that, in the aspect of washing oil and the structure of dissolved mud cake, The effect of composite mud cake scavenger is better than that of nanometer emulsion. The stability of the compound mud cake scavenger is strong, the temperature resistance can reach 120 鈩，

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