电场对岩石及粘土矿物颗粒粒度的影响研究

STUDY ON THE INFLUENCE OF EXTERNALLY APPLIED ELECTRIC FIELD ON GRAIN SIZE OF ROCK AND CLAY MINERAL

孙虎 张宁生 吴新民

Sun Hu Zhang Ningsheng Wu Xinmin

长庆石油勘探局, 甘肃庆阳 745160 西安石油学院, 陕西西安 710056

通过加电前后岩石颗粒的粒度测定试验,研究了外加电场对岩石骨架颗粒和粘土矿物性质的影响。试验中发现粘土矿物及其一些微细组分在电场作用下发生明显的电聚结作用。岩石矿物在电场中的粒度发生变化,变化都是向着粒径变大的方向。小粒径的岩石颗粒,特别是粘土矿物颗粒在电场作用下明显聚结变粗;但对大粒径的岩石骨架颗粒作用尚不明显。在电场的不同位置作用效果不同,其一般规律是阳极小于中部,中部小于阴极。电场作用时间长,粒径变化越大;在相同电场作用时间下与电流的大小有关。

This paper tries to study how the externally applied electric field influence the properties of rock grain and clay minerals, by testing the grain size before and after applying electric current. Electric agglomerating of clay minerals and fine compositions is obviously detected in the electric field, and rock grain size changes too, with the tendency of becoming larger. This tendency is very obvious for small particles, especially for clay minerals. In different areas of the electric field, its effect is different. Specifically, much obvious effect is found at the cathode than that at the anode. The change of grain size is also proportional to the time affected; yet it has no correlation with current strength in the same electric field and the same amount of time.

10.3969/j.issn.1000-7393.2001.01.003