新型页岩抑制剂的合成及性能研究
Synthesis and performance study of a new shale inhibitor
以四乙烯五胺和β-环糊精(β-CD)为主要单体,环氧氯丙烷做交联剂,采用溶液聚合法合成了一种新型页岩抑制剂(TD)。产物经红外光谱和热重表征,证明为目标产物。抑制性能评价结果表明:膨润土块在TD抑制剂溶液中可维持其完整性,表面无孔洞且微裂缝减少;当TD质量分数为3%时,膨润土的线性膨胀高度为4.65 mm,同时页岩滚动回收率为76.75%,相比去离子水中增加了52.95%,证明其抑制性能良好。采用电动电位(Zeta电位)、X射线衍射(XRD)和扫描电子显微镜(SEM)揭示了抑制剂TD的微观作用机理,结果表明:TD可与粘土发生插层吸附并改变粘土的微观形貌。TD通过中和粘土颗粒表面的负电荷压缩双电层,在粘土颗粒表面形成强吸附,拉紧晶层,抑制水分子向粘土层间侵入,从而抑制粘土的水化膨胀。
A new shale inhibitor,TD,was synthesized by solution polymerization using tetraethylene pentamine and β-cyclodextrin (β-CD) as the main monomers,epichlorohydrin as the crosslinking agent.The product was characterized by infrared spectroscopy and thermogravimetric analysis,and proved to be the target product.The evaluation results of inhibition performance show that bentonite blocks can maintain their integrity in TD inhibitor solution,with no pores on the surface and reduced microcracks;When the TD mass fraction is 3%,the linear expansion height of bentonite is 4.65 mm,and the shale rolling recovery rate is 76.75%,which is an increase of 52.95% compared to deionized water,proving its good inhibitory performance.The micro mechanism of the inhibitor TD was revealed using Zeta potential,XRD,and SEM.The results showed that TD can undergo intercalation adsorption with clay and change the micro morphology of clay.TD compresses the double layer by neutralizing the negative charge on the surface of clay particles,forming strong adsorption on the surface of clay particles,tightening the crystal layer,and inhibiting the invasion of water molecules into the interlayer of clay,thereby suppressing the hydration expansion of clay.
水基钻井液 / 页岩抑制剂 / 水化膨胀 / 井壁稳定 / 性能评价
water-based drilling fluid / shale inhibitor / hydration expansion / borehole stability / performance evaluation
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中国石油化工集团公司科技部项目(421034)
辽宁省兴辽英才计划项目(XLYC1902053)
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