摘要
VES自转向酸分流酸化技术是近年来发展起来的实现大井段、多层系储层改造的新方法,VES自转向酸体系是实现该技术的关键。把室内合成的油酸酰胺丙基甜菜碱作为稠化剂,优化形成VES自转向酸体系,并对VES自转向酸体系的流变性能进行了研究。系统测试了酸液体系的pH值、环境温度以及剪切速率对残酸体系表观粘度的影响。实验结果表明,在不同环境下VES自转向酸体系的表观粘度都能保持在100mPa.s以上,能够保证分流酸化施工的顺利进行。酸液主要添加剂(缓蚀剂以及铁离子稳定剂等)都使残酸体系表观粘度有一定的下降,所以在优选酸液体系过程中必须进行酸液体系配伍性测试。当VES自转向酸体系中的铁离子质量浓度超过1g/L后,体系发生相分离或者絮凝,失去分流转向的能力。
The acidizing technique of VES self-diversion acid diversion is a newly developed approach,which is implemented to realize the long interval and multilayer reservoir stimulation.VES self-diversion acid system is critical to the feasibility of this technique.In this paper,the synthesized oleic amidopropyl betaine is adopted to optimize the VES self-diversion acid system and study the rheological of this syetem.The pH of the system,environment temperature and shear rate on the viscosity are systematically tested to evaluated their influence on the visual viscosity of residual acid.It is proved by the test that,the visual viscosity of the VES self-diversion acid system may be sustained above 100mPa·s under different environment and may ensure the acidizing treatment in the field.Study also shows that the main additives (corrosion inhibitor and ferric stabilizer) have certain effect on the viscosity of the system,which will make the viscosity decline.Therefore,it is proposed to conduct compatibility test.When the content of ferric ion is above 1000ppm,the system phase separation and coagulation are inevitable and detrimental to the viscosity of the system that may cause the failure of diversion.
出处
《油气地质与采收率》
CAS
CSCD
北大核心
2010年第4期104-107,共4页
Petroleum Geology and Recovery Efficiency
基金
国家自然科学基金项目"缝洞型碳酸盐岩油气藏酸蚀蚓孔基础理论研究"(50774064)
关键词
储层改造
分流酸化
自转向酸
油酸酰胺丙基甜菜碱
流变性
stimulation
diversion acidizing
VES self-diversion acid
oleic amidopropyl betaine
rheological
