The Numerical and Experimental Research on Solid-liquid Two-phase Flow Pattern in the PID

Abstract

Particle impact drilling (PID) technology can effectively improve the speed of drilling in deep and hard formations. It is important to study the particle flow pattern in the annulus since it can ensure the smooth implementation of PID. In this paper, experimental and numerical methods are used to study the law of motion in the annulus. This study finds that the distribution of particles in the annulus is uneven, and the particle settling velocity is hardly affected by the fluid density, fluid velocity, particle volume concentration. Particle settling velocity decreases with the increasing of drilling fluid viscosity, but increases with the increasing of the particle diameter. On this basis, the reasonable parameters of the drilling fluid for PID are obtained.
Key words: Petroleum engineering; Particle impact drilling; Solid-liquid two-phase flow