摘要
四川盆地高石梯~磨溪构造带震旦系储层具有温度高、埋藏深、储层缝洞发育、非均质性强等特征,针对性的酸液体系及配方选择是获得此类储层增产改造的关键因素之一。结合震旦系储层特征,分析了储层改造技术难点,开展了针对性的酸液性能评价试验研究,结果表明:(1)胶凝酸、转向酸具有良好的控滤失性能,滤失系数为10^(-4)~10^(-5)级;(2)胶凝酸、交联酸具有较低的摩阻,平均摩阻系数分别为0.377 7和0.366 4;(3)胶凝酸、交联酸具有较低的酸岩反应速率,平均酸岩反应速率为10^(-5)级;(4)转向酸可对40倍渗透率岩心实现转向,变黏黏度可达70 mPa·s;(5)可降解纤维在150℃下,2.5h可完全降解。试验表明,注入压力提高了3.2 MPa。探索形成了4类储层特征下针对性的酸液体系优选原则,优选的酸液体系在震旦系储层得到了大量的应用。
The reservoir of Gaoshiti-Moxi structure of Sinian system in Sichuan Basin has the characteristics of high temperature,deep buried,fractured-vuggy development and strong reservoir heterogeneity.The acid fluid system and formula selection is one of the key factors to stimulate the reservoir and increase production.Combined with the characters of Sinian system,the technical difficulties of reservoir stimulation were analyzed,the acid liquid system performance experiments were carried out,and results showed that：（1）The filtration performance of gelled acid and VES acid is good,and the filtration coefficient is about 10^（-4）-10^（-5） level;（2）the friction resistance of gelled acid and cross-linked acid is low,the average friction coefficient is 0.377 7and 0.366 4 for each acid;（3）the acid-rock reaction rate of gelled acid and cross-linked acid is low,and the average reaction rate is about 10^（-5） level;（4）the VES acid can treat the 40 times permeability cores diverting successfully,and the most variable viscosity can reach 70 mPa·s;under 150℃ for 2.5h,the degradable fiber can degrade completely,the injection pressure can achieve 3.2MPa in the test.Finally,the acid system optimum principles have developed based on four types of reservoir characteristics,and the optimized acid systems have successfully applied in Sinian system reservoir.
出处
《石油与天然气化工》
CAS
北大核心
2016年第3期51-56,共6页
Chemical engineering of oil & gas
基金
中国石油天然气股份有限公司油气勘探重点工程技术攻关项目"超深高温高压含硫化氢储层及复杂岩性低渗储层试油(含措施改造)配套技术研究"
关键词
四川盆地
高石梯
磨溪
震旦系
储层改造
滤失
摩阻
酸岩反应
转向
Sichuan Basin
Gaoshiti
Moxi
Sinian system
reservoir stimulation
filtration
friction resistance
acid-rock reaction
diverting
