Study on the Pulser Erosion Mechanism of Vertical Well Inclinometer through CFX Numerical Simulation

Abstract

In the application of vertical well inclinometer, the erosion wear of pulser under various working conditions such as high displacement is the main factor leading to its failure. In this paper, based on the analysis of erosion factors and theoretical erosion rate, SolidWorks is used to restore the pulse structure with the same material and the same size. DPM multiphase flow model in Fluent and CFX numerical simulation is used to simulate the fluid/particle movement state and distribution law of the pulse under the downhole operation state. From the velocity, pressure, turbulence parameters, particle mass concentration and other body parts for key erosion, erosion mechanism and analysis, main show is to fluid cluster after local turbulence caused by the phenomenon, the upper fluid blocked reflection and original fluid phenomenon of turbulence in the collision, water hammer effect of instantaneous high pressure effect, local vortex caused by uneven pressure, The flow regime changes caused by Karman vortex street effect, the collision process caused by the accumulation and aggregation of particles, and the impact process caused by the fluid transport particles on the wall.