抗温耐盐降滤失剂的合成及评价
Synthesis and evaluation of high-temperature and salt-resistant filtration reducers
以丙烯酰胺(AM)和2-丙烯酰胺基-2-甲基丙烷磺酸(AMPS)为单体,创新性地引入纳米碳酸钙作为无机核芯,通过包覆聚合合成了一种抗温耐盐降滤失剂(DY)。傅里叶变换红外光谱(FT-IR)与热重分析(TG)证实其分子结构正确且热稳定性优良(T5%=205.29℃)。性能评价表明,DY在210℃、15% NaCl条件下仍保持优异性能:加入2.5% DY后,老化后常温常压(API)滤失量仅为11.2 mL。结合扫描电子显微镜(SEM)、比表面积与孔径分析仪(BET)、粒度分布与Zeta电位等表征,系统揭示了DY通过形成致密滤饼、优化颗粒分布与增强静电稳定性的多重作用机制,为高温高盐钻井液提供了新型高效处理剂。
Using acrylamide (AM) and 2-acrylamido-2-methylpropanesulfonic acid (AMPS) as monomers,nano-calcium carbonate was innovatively introduced as an inorganic core,and a high-temperature and salt-resistant fluid loss agent (DY) was synthesized via encapsulation polymerization.Fourier-transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TG) confirmed its correct molecular structure and excellent thermal stability (T5%=205.29℃).Performance evaluation demonstrated that DY maintains outstanding performance even under conditions of 210℃ and 15% NaCl:with the addition of 2.5% DY,the API filtration loss after aging was only 11.2 mL.Combined with characterization techniques such as scanning electron microscopy (SEM),specific surface area and pore size analyzer (BET),particle size distribution,and Zeta potential analysis,the multiple mechanisms of DY were systematically elucidated,including the formation of a compact filter cake,optimization of particle distribution,and enhancement of electrostatic stability.This provides a novel and efficient treatment agent for high-temperature and high-salinity drilling fluids.
filtration reducers / CaCO3 / high-temperature resistance / salt resistance / filter cake
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王中义, 孙金声, 黄贤斌, |
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崔彦琦, 于洪江, 雷亮, |
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