Numerical Simulation of Hydrate Particle Deposition in Reduced-Diameter Pipes Based on an Improved Model

High-pressure and low-temperature conditions for hydrate production are highly prone to occur during deep-water development, which may cause serious hydrate deposition problems. Current studies on hydrate deposition have mainly focused on through-diameter conditions, and relatively few studies have been conducted for reduced-diameter conditions. In this paper, a hydrate deposition model considering hydrate particle-fluid-pipe wall interaction is established based on the adhesion and rebound criteria of hydrate particles. The effects of important parameters on the deposition characteristics of micron-sized hydrate particles are investigated, and the deposition mechanism of hydrate in the reduced-diameter pipe is revealed. The results of the study can provide a valuable reference for the study of hydrate flow assurance in deep water.