【摘要】：針對裂縫性致密砂巖儲層存在的高密度油基鉆井液固相顆粒侵入以及泥餅難以清除等問題,開發(fā)出一種高效率、抗高溫、低成本的水包油型復(fù)合泥餅清除劑。復(fù)合泥餅清除劑由混合酸、抗高溫滲透劑、清洗劑、乳化劑等組成。通過對復(fù)合泥餅清除劑——水包油型乳液體系以及新型泥餅清除劑——納米乳液體系的對比研究分析表明,在洗油方面以及溶蝕泥餅結(jié)構(gòu)方面,復(fù)合泥餅清除劑效果優(yōu)于納米乳液。該復(fù)合泥餅清除劑的穩(wěn)定性能強(qiáng),抗溫可達(dá)120℃;在靜態(tài)條件下泥餅清除率可以達(dá)到90%以上,在動態(tài)條件下清除后巖心滲透率恢復(fù)值可以達(dá)到89%,最佳作業(yè)時間為8 h。在目前求降本增效的形勢下,該復(fù)合泥餅清除劑劑配方簡單,性能優(yōu)良,解堵時間較短,能夠有效改善和提高巖心滲透率恢復(fù)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，

本文編號：2203618