聚胺抑制剂和蒙脱土的作用机理

采用X射线衍射（XRD）、扫描电镜（SEM）、红外（IR）考察了由开环聚合反应制备的聚胺处理前后粘土层间距、官能团及表面形态的变化，初步确定了聚胺的页岩抑制机理。结果表明，聚胺305 mm2/s＜ν＜1940 mm2/s、2.235 mmol g-1＜CD＜4.426 mmol g-1时，可实现对粘土的有效束缚，可将黏土层间距由1.572nm缩至1.361- 1.413nm范围内；在上述物性参数范围内，粘土层间距与运动粘度关系不大，与阳离子度关系极为密切，阳离子度越大，层间距越大。IR、XRD及SEM表明，聚胺能够运移至地层发生作用，通过静电引力、氢键作用、锚固作用以及疏水作用等实现对粘土的有效束缚，从而起到良好的井壁稳定效果。

Mechanism of the Interaction Between Polyamine Inhibitor and Montmorillonite

Using X-ray diffraction (XRD), scanning electron microscope (SEM) and infrared spectra (IR), clay lattice spacing, functional group and surface morphology changes of clay pre and post treatment by polyamine, which was prepared by ring-opening polymerization, were investigate respectively. Based on the above, the shale inhibition mechanism was identified preliminarily. Results show that, when kinetic viscosity was from 305 mm2/s to 1940 mm2/s, cationic degree from 2.235 mmol/g to 4.426 mmol/g, polyamine can effectively bound clay up, with lattice spacing ranging from 1.572nm to1.361- 1.413nm. In the range of the above physical property parameters, the lattice spacing of clay has little relation with kinetic viscosity of polyamine, but was greatly dependent on cationic degree of polyamine, and the higher the cationic degree, the higher the lattice spacing. IR, XRD, SEM show that, via electrostatic interaction, hydrogen bonding, anchoring effect and hydrophobic effect, polyamine can migrate to formation to take effect and exhibits excellent borehole stability.