醇基压裂液在深层低渗油藏压裂改造中的应用

Application of Alcohol-based Fracturing Fluid in Deep and Low Permeability Reservoir

针对深层低渗储层特点和压裂工艺要求,开发了醇基压裂液体系,并对其性能进行了评价。室内试验结果表明,醇基压裂液具有良好的耐温能力,耐温达208℃。与水基压裂液相比,相同条件下醇基压裂液耐剪切能力明显提高,能够实现延迟交联,滤失系数小。在破胶剂EB-1的作用下,醇基压裂液破胶化水彻底,破胶液具有更低的表面张力和界面张力,返排效果好,对岩心伤害率仅为19.4%。10余井次的现场应用表明,醇基压裂液能够满足深井低渗储层压裂施工要求。

According to the characteristics of deep reservoir with low permeability and the requirements of fracturing technology, alcohol -based fracturing fluid was prepared. The experimental results indicated that the alcohol - based fracturing fluid had good temperature tolerance of up to 208℃. Compared with water - based fracturing fluid under the same conditions, the alcohol -based fracturing fluid had better shear - resistance property, longer delayed crosslinking turing fluid could be broken down thoroughly to of the alcohol - based fracturing fluid had lower back, and lower rate of core damage of 19.4%. showed that the alcohol -based fracturing fluid with low permeability. time, and lower filtration coefficient. The gel formed by frac- water in the presence of breaker EB - 1. The broken solution surface tension and interfacial tension, good effect of flow - The application of alcohol - based fracturing fluid in the field could satisfy the requirements of fracturing in deep reservoir