Robertson－Stiff流体环空螺旋流的解析解

ANALYTICAL SOLUTIONS FOR THE HELICAL FLOW OF ROBERTSON-STIFF FLUID IN AN ANNULUS

研究Ｒｏｂｅｒｔｓｏｎ－Ｓｔｉｆｆ流体环空螺旋流具有工程意义。一些钻井液可看为Ｒｏｂｅｒｔｓｏｎ－Ｓｔｉｆｆ流体，而其在钻杆和井筒的环空中的流动便是螺旋流动。本文根据非牛顿流体力学原理，对Ｒｏｂｅｒｔｓｏｎ－Ｓｔｉｆｆ流体环空螺旋流进行了解析求解，最终得出了速度、流量和压力梯度的计算公式。

Abstract It is significant to study the helical flow of Robertson-Stiff fluid in an annulus.Some drilling fluids can be considered as Robertson Stiff fluids ,which flow helically in annuli formed by drill pipes and well bores .According to the principles of non-Newtoni-an fluid mechanics.this paper analyzes the helical flow of Robertson-Stiff fluid in an an-nulus and gives the calculating formulae of velocities. flow rate and pressure gradient fi-nally.SUBJECT TERMS Robertson-Stiff fluid .helical flow .analytical solution