多氢酸深部分流酸化技术在东河油田的应用研究与效果评价

Application and Evaluation on Multi-Hydro Acid Deep Diversion Acidizing Technology in Donghe Oilfield

关键词:  低渗  多氢酸  分流酸化  CⅢ油组1号岩性段

Key words:  CⅢ 1st reservoir  low permeability  multi-hydro acid  diversion acidification

摘要:

塔里木盆地东河油田CⅢ油组1号岩性段储层非均质性强、物性差,注水难以达到配注要求,造成地层能量不足,产量下滑快,且常规酸化施工不能很好地解除地层深部的污染。本试验针对该油藏低渗、高岭石粘土含量高的特点,提出使用具备缓速深部酸化性能的多氢酸酸液体系的方案,并结合多氢酸酸化机理分析了多氢酸对该油藏的适应性;针对该油藏非均质性强的特点,为实现水平段均匀酸化,提出在酸化过程中加入水溶性分流剂的方案,并在实验室内对现场岩心进行了分流酸化模拟实验。在取得一定认识的基础上,对该油藏A15H井实施了多氢酸分流酸化措施,取得了显著的增注效果。

Abstract:

Because of the high inhomogeneity and bad property of CⅢ 1st reservoir in Donghe oilfeild of the Tarim basin, the water injection is usually inaccessible to the geology injection allocation. So the producing energy is deficient and the oil production descends quickly. The conventional acidification can’t relieve the formation deep contamination. According to the trait of the low permeability and high component kaolinite clay, this paper developed a multi-hydro acid system that can realize the deep acidification slowly, and analyzed the adaptability of multihydro acid applied in Donghe oilfield combined with the acidification mechanism of it. According to the trait of high inhomogeneity, hydrotrop was diverted into the acidizing fluid, and the simulated experiment of diversion acidification was carried out for site core in laboratory. The multihydro acid was recommended to apply in A15H well in this reservoir and significant effect of increasing injection was attained.