摘要
VES自转向酸分流酸化技术是近年来发展的能够实现大井段、多层系储层改造的新方法,依靠酸液特殊的变黏特性实现酸液的自主分流,提高分流酸化设计针对性以及施工成功率和有效率。从影响VES自转向酸黏度变化的pH值以及无机盐入手,通过系统实验发现:在无CaCl2等无机离子的情况下,酸液pH值变化能使VES自转向酸具有较高的黏度,在鲜酸环境下,加入CaCl2对酸液黏度不会产生太大影响,在残酸环境下,加入CaCl2使酸液黏度明显增加;此外,与不加CaCl2的残酸相比,加入CaCl2后酸液达到最大黏度所对应的pH值较低。
The VES self-diversion acid diversion acidizing technology is a newly developed approach, which is to realize the stimulation of long intervals and multi-reservoir. Relying on the special viscosity performance, the authigenic diversion of acid acidizing can be realized, as well as the success rates of acidizing design and operation can be enhanced. Systematic experiments shows that: without inorganic salt such as CaCl2, the variation of pH can cause VES self-diversion acid viscosified, with fresh acid, CaCl2 have no significant influence on the viscosity of acid, while with residue acid, CaCl2 makes the acid viscosified obliviously. Meanwhile, compared with the residue acid without CaCl2, it reaches the maximum viscosity at lower pH.
出处
《钻井液与完井液》
CAS
2010年第4期84-86,共3页
Drilling Fluid & Completion Fluid
关键词
增产措施
分流酸化
VES自转向酸
变黏机理
Stimulation
Diversion acidizing
VES self-diversion acid
Viscosifying mechanism
