摘要
对一种新研制的泡沫酸进行了缓速性能、分流性能、返排性能的动态评价.结果表明,这种泡沫酸在温度120℃、矿化度16×104mg/L及含油10%~30%条件下具有以下特性:①在相同反应条件下,2h之内的溶蚀率明显低于对比酸液,具有良好的缓速性能;②对高渗透率岩心表现出暂堵作用,使后继酸液进入中低渗透岩心,压力平衡后,高低渗透率岩心同步进酸,显示出了较好的分流性能;③返排率随渗透率的增加而增加,3个试验样品的返排率都大于78%,比常规酸液要高的多,说明该泡沫酸具有良好的返排性能.
A dynamic evaluation is conducted on the characters of retarding, diffluence and flowback for a newly developed foamed acid. The result shows that under the conditions that temperature is 120℃, salinity is 16×10~4 mg/L and oiliness is 10% to 30%, the foamed acid has the characteristics including:①under the same reacting condition, it has a good retarding performance, its dissolution rate is obvious lower than that of the contrasted acid within 2 hours; ②it presents temporary plugging effect on high permeability cores, it indicates better diffluence performance, as consequent acid enters into the middle-low permeability cores, after its pressure is balanced, acid enters into the high permeability core synchronously with the low permeability one; ③flowback rate increases with the going up of permeability, the flowback rate of 3 samples is over 78%, which is much higher than that of conventional acid. It indicates that the foamed acid has good flowback performance.
出处
《石油天然气学报》
CAS
CSCD
北大核心
2005年第1期83-85,共3页
Journal of Oil and Gas Technology
基金
中国石油化工集团公司"十五"重点攻关项目(P03026)。
关键词
泡沫酸
酸化
缓速性
分流性
返排率
高温高盐油藏
foamed acid
acidizing
retarding property
diffluence performance
flowback rate
reservoir with high temperature and high salt