Development and Performance of Solid Boron Crosslinking Agent
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摘要: 研制出一种压裂用固体无机硼交联剂G-CYS,评价了其交联特性,设计了适用于100、120、140、160℃不同温度条件的4种压裂液体系。在相应温度下4种体系均具有良好的耐高温和耐剪切性能,破胶彻底、破胶液黏度低,在160℃以1000 s-1的速率高速剪切2 min,在170 s-1剪切120 min后黏度保持在120 mPa·s以上,满足中高温储层压裂需要。体系的交联时间可以通过pH值和温度2方面控制,交联完成后可以保持60 min以上不脱水,避免由于现场施工延迟导致体系脱水、性能变差等问题。Abstract: This paper discusses the development and performance of a solid inorganic boron crosslinking agent, G-CYS, for use in fracturing, and four fracturing fluids for use at 100℃, 120℃, 140℃, and 160℃, respectively. The four fracturing fluids at different temperatures have good high temperature stability and shear thinning performance, and their gels are thoroughly broken to low viscosity fluids. At 160℃, the fracturing fluid has a viscosity of 120 mPa·s after shearing 2 min at 1000 s-1, or 120 min at 170 s-1, satisfying the needs for medium or high temperature fracturing. The dissolution rate of the solid boron crosslinking agent can be controlled with pH and temperature, thereby adjusting the time for cross linking. The fracturing fluid, after completion of crosslinking, will not dewater for more than 60 min, which is satisfactory for field use, where job delay inevitably leads to dewatering and quality-deterioration of fracturing fluids.
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