论文部分内容阅读
以往研究砂岩基质酸化最常用的方法是短岩心酸化流动试验，本文提供了一种长岩心酸化流动试验研究新方法。长岩心酸化流动试验结果表明：采用前置盐酸和低浓度氢氟酸有利于提高酸化效果，残酸离子分析证实高温地层酸化极易形成Si（OH）4沉淀。但短岩心酸化流动试验结果为：加大酸液浓度和用酸强度有利于提高酸化效果。对比短岩心和长岩心酸化流动试验结果表明：只有模拟就地条件下的长岩心酸化流动试验才能更好地优选酸液体系，达到优化酸化设计的目的，经现场应用取得显著效果。
In the past, the most commonly used method to study the acidification of sandstone was the short core acidification flow test. In this paper, a new method for the study of long core acidification flow was provided. The result of acidification flow in the long core shows that the pretreatment of hydrochloric acid and low concentration of hydrofluoric acid are favorable to improve the acidification effect. The analysis of residual acid shows that the formation of Si (OH) 4 precipitate easily in high temperature formation. But the short core acidification flow test results: increase the acid concentration and acid strength help to improve the acidification effect. The results of the acidification flow test of short core and long core show that only the long-core acidification flow test under simulated in-situ conditions can better optimize the acid system and achieve the goal of optimizing the acidification design.