Analysis on the influencing factors of secondary damage of seawater-based acid on sandstone reservoir

被引：0
|
作者：
Li X. [1 ]
Zhang G. [1 ]
Ge J. [1 ]
Jiang P. [1 ]
Pei H. [1 ]
Zhang X. [1 ]
Wu H. [1 ]
机构：
[1] School of Petroleum Engineering in China University of Petroleum, Qingdao
来源：
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | 2017年 / 41卷 / 03期
关键词：
Abnormal common-ion effect; Acidizing; Sandstone reservoir; Seawater; Secondary damage;
D O I：
10.3969/j.issn.1673-5005.2017.03.020
中图分类号：
学科分类号：
摘要：
The damage type of seawater-base acid was analyzed by X-ray diffraction technology. And the effects of acid types, pH value, dilution ratio of seawater and electrolytes on the secondary damage were studied by the turbidity method. It is found that the damage in seawater-based acid preparation and reaction is mainly formed by MgF2 and CaF2. Compared with mud acid system, multi-hydrogen acid is better in mitigating the secondary damage. Increasing the amount of HCl, diluting seawater and using appropriate electrolytes can also effectively inhibit the precipitations. Based on the analysis of the acid effects, the complexation effect, and a special kind of abnormal common-ion effect, one seawater-based acid system that can eliminate the secondary damage in sandstone matrix treatmentis developed. © 2017, Periodical Office of China University of Petroleum. All right reserved.
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页码：161 / 168
页数：7
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