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砂岩地层酸化解堵一般采用 1 2 %HCl+ 3%HF +添加剂的标准土酸体系 ,但对特殊储层 ,如伤害半径小、油层能量低等储层 ,为达到特殊的酸化目的 ,可以采用高浓度土酸进行酸化。文中在分析探井储层特征、探井地层伤害主要因素 ,通过对高浓度土酸酸化液浓度及添加剂以及酸液与储层的适应性研究的基础上进行现场 1 1口井近 2 0井次的高浓度土酸酸化试油实践 ,证明高浓度土酸酸化试油工艺具有用液程序简单、用液量少、返排快等特点 ,是解除地层堵塞 ,提高地层渗透率的有效手段。
Sandstone acidizing plugging generally use the standard earth acid system of 12% HCl + 3% HF + additives, but for special reservoirs, such as reservoirs with low injury radius and low oil layer energy, for high acidification purpose, high Concentration of soil acid acidification. In this paper, based on the analysis of the characteristics of exploration wells and the main factors of formation damage in exploratory wells, based on the study of the concentration of acid soil of high concentration and the adaptability of additives and acid and reservoir, High concentration of acid soil test oil practice proved that the high concentration of soil acidification test oil with a liquid program is simple, with less liquid, return row fast and so on, is to remove the formation plugging and improve permeability of the formation of effective means.