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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。
In this paper, we use the method of measuring the movement of a single particle in a group and revealing the law of group motion. The study of the motion of a group of particles in Newtonian fluid and power-law fluid on a vertical and concentric full- Concentration on the particles in the axial flow and spiral flow on the back and flow in static or rotating sinking rate of the law, which were derived in the Newtonian particles or power law fluid axial flow and spiral Semi-empirical formula for going back in the flow and sinking in a stationary or rotating flow field. The semi-empirical formula was used to correct the model of bottom hole pressure calculated by Qian Simultaneously. The downhole pressure formula was derived from the pressure of slurry liquid column, annular pressure loss and annular solid concentration. And put forward some new opinions on the basis of determining the reasonable return velocity of annulus in jet drilling.