硅酸盐钻井液的组成与流变性的关系

配制了一系列钻井液，并对其流变性进行了测试，研究了硅酸盐钻井液的组成对其流变性的影响。试验结果表明，未水化粘土和岩屑的积累使硅酸盐钻井液粘度和切力迅速升高，这是硅酸盐钻井液流变性变差的首要因素。较高模数的硅酸盐对各种浓度的膨润土基浆均有解絮凝和降粘作用，而对含有许多劣土和处理剂的钻井液有显著的增粘作用。硅酸盐阳离子中钾／钠值越高，对基浆的降粘作用就越小，对钻井液的增粘作用则越大。简单盐对硅酸盐钻井液具有一般的常规作用；对组成基本相同、而ｐＨ值不同的钻井液，加入硅酸盐能减小其粘度差别。

/RELATIONSHIP BETWEEN COMPOSITIONS AND RHEOLOGY OF SILICATE DRLLING FLUID/

The compositions of silicate drilling fluid have some effects on its rheology. A set of drilling fluids were preperared, and rheologies of silicate drilling fluids were tested. The results show that the collection of clays and cuttings containing Ca 2 is the primary factor that disrupts the rheology of silicate drilling fluid, which increases the rheology greatly. Silicates with high ratios can deflocculate bentonite base muds with various concentrations, decrease their viscosity and increase the viscosity of field mud containing much formation clays and additives. The higher the K /Na ratio in the silicate is, the smaller the decreasing viscosity effect is, and the greater the viscosifying effect will be. Additive, such as NH 4 PAN, has a poor compatibility for silicate drilling fluid. Salts menifest their customary properties in silicate drilling fluid. The drilling fluids with the same composition and different pH values have the less difference in viscosities after silicate is added.