EXPERIMENTAL RESEARCH ON HYDROPHILIC CHARACTERISTICS OF MUDSTONE IN DEEP WELL

In order to grasp the hydrophilic characteristics of mudstone in deep well,a self-developed soft rock hydrophilic experiment system is used to analyze the main influential factors,as well as SEM and X-ray techniques are applied.Based on a series of test results of diverse mudstone samples,the hydrophilic characteristics can be divided into two stages in time series,i.e.decelerating suction phase and uniform speed suction phase.According to the lnQ-lnt curve,where Q is the soakage and t is the soaking time,there are three kinds of curves: convex,concave and linear curves.Porosity,content and sort of minerals as well as clay occurrence are the main factors influencing the hydrophilic characteristics of mudstone.The soaking velocity or soakage of mudstone is directly proportional to its porosity,but is inversely proportional to the clay mineral content.The characteristic curve is also affected by the occurrence of clay mineral obviously.