固相浓度对固相颗粒在液相中运动规律影响的实验研究

本文运用测量群体中单个颗粒的运动进而揭示群体运动规律的方法,在垂直、同心的全尺寸环空实验架上完成了群体颗粒在牛顿流体和幂律流体中运动规律的研究,得到了固相浓度对颗粒在轴向流及螺旋流流场中上返以及在静止或旋转流场中下沉速度的影响规律,从而分别得出了群体颗粒在牛顿流体或幂律流体的轴向流和螺旋流中上返及在静止或旋转流场中下沉的半经验公式。用所得的半经验公式校正了钱思复计算井底压力的模式,给出了由泥浆液柱压力、环空循环压耗以及环空固相浓度产生的井底压力计算公式。并对确定喷射钻井中环空合理返速的依据提出了一些新的看法。

THE EFFECT OF SOLID CONCENTRATION ON THE MOVEMENT OF SOLID PARTICLES IN SOLID-LIQUID MIXTURE FLOW

In this paper, the moving performance of mass particles in Solid-liquid mixture flow of Newtonian and Power Law fluids was experimentally studied on a full scale annular simulator by measuring the movement of a single particle in the mass particles. The effects of solid concentration on the performance of particles moving up in the axial flow and helical flow or settlingdown in static or rotating fluid have been discovered. Consequently, the qusi-empirical equations for the moving up and settling down of particles in an-nulus have been obtained and used to modify the model developed by Sze-Foo Chien. The new equations for calculating the well bottom pressure produced by column of the drilling fluid, annular pressure lose and solid concentration are presented in this paper. The basis for determining the reasonable annular velocity in jet-drilling is also discussed.