A Study on the Solid-Liquid Helical Flow in a slim hole annulus

摘要

An experimental investigation is carried out to study two-phase vertically upward hydraulic transport of solid particles by water and non-Newtonian fluids in a slim hole concentric annulus with rotation of the inner cylinder. Studying the rheology of particulate suspensions in viscoelastic fluids is essential in many applications such as particle removal from surfaces, transport of proppants in fractured reservoir and cleaning of drilling holes, etc. In this study a clear acrylic pipe was used in order to observe the movement of solid particles. Annular fluid velocities varied from 0.2 to 3.0 m/s. Pressure drop, average flow rate, and particle rising velocity are measured. The higher the concentration of the solid particles is, the larger the pressure gradient becomes in both water and 0.2% Carbomethyl Cellulose(CMC) solutions.