新型环烷胺页岩抑制性评价及分析

Evaluation and Analysis on the Inhibitive Capacity of a New Naphthenic Amine

通过分子结构设计,研制了新型环烷胺作为泥页岩抑制剂。采用抑制膨润土造浆实验、页岩滚动分散实验和絮凝实验评价了其抑制性能。结果表明,新型环烷胺的抑制性优于国外聚胺Ultrahib和传统的无机盐类抑制剂KCl;180℃下仍能抑制泥页岩水化分散,具有优良的抗温性能。表面张力测试和X-射线衍射分析干态层间距表明,新型环烷胺具有较强的表面活性,能显著降低水溶液表面张力,且能够进入黏土晶层间,形成单层吸附。X-射线衍射分析湿态层间距和吸水实验表明,环烷胺通过质子化胺基吸附在黏土晶层间,置换出层间水化阳离子,大幅度降低黏土层间距,同时增加黏土表面的疏水性,实现泥页岩稳定。

A new naphthenic amine shale inhibitor was developed through molecular structure design, and its inhibitive capacity studied through bentonite yield experiment, hot-rolling test and flocculation test. The experimental results showed that this naphthenic amine is better than the poly amine inhibitor Ultrahib and KCl as a shale inhibitor. It functions at temperature of 180 ℃. Surface tension test and measurement of interlayer spacing of clay with X-ray diffraction experiment showed that it has strong surface activity, which means that it can remarkably reduce the surface tension of water, and can form single-layer adsorption while entering the interlayer spacing of clay. Further study showed that the naphthenic amine molecules displace hydrated cationic ions originally presented in the interlayers of clay through adsorption of protonized amino base onto the inter-surface of clay layers, greatly reducing the c-spacing of clay, and strengthening the hydrophobicity of clay, which lead to the stabilization of claystones and shales.