摘要
泥页岩水化膨胀可诱发或加剧井壁岩石受力平衡，水化膨胀压是泥页岩井段井眼不稳定研究中必须研究的内容，而直接测定泥页岩水化膨胀压相当困难。泥页岩水化膨胀压是其中粘土颗粒间的排斥力。文中介绍了根据双电层理论，用矿物学参数计算水化膨胀压的方法。这些参数包括比表面积，表面电荷密度、膨胀后孔隙水中离子浓度，双电层中反离子价数及粘土颗粒间距。还具体说明了计算步骤和这些参数的获取方法并给出了算例。
The hydration swelling of shale may cause to or intensify the mechanics unbalance of borehole. The hydration swelling pressure of shale should be studied when studying borehole instability problems. But, it is quite difficult to measure it directly. This paper presents that the hydration swelling pressure of shale is the repel force betweem clay particles caused by osmotic hydration of clay minerals and provides a theoretic method to calculate the swelling pressure of shale using mineralogical parameters according to double layer theory. These parameters include the specific surface of clay fraction, the specific charge of clay, the ions concentration in the pore fluid specimen after swelling test, the valence of the counterions and the half distance between the clay plates in the specimen. This paper shows particularly the calculation steps and the ways to get these parameters and an example.
出处
《西南石油学院学报》
CSCD
1997年第4期53-56,共4页
Journal of Southwest Petroleum Institute
基金
"九五"科技项目
关键词
泥页岩
水化学
水化膨胀压
钻井工程
Hydrate control
Hydrochemistry
Clay swelling
Clay stabilization
Hole sloughing prevention
Hole stabilization
