Study On The Internal Erosion Characteristics Of The Rotary Liner Hanger Bearing And Numerical Simulation

With the rapid development of the oil industry,people are paying more and more attention to the rotating liner hanger in order to improve the drilling and cementing quality of complex wells.The bearing is a key component of rotary liner hanger,whose performance directly affects the quality of cementing.The drilling flow that enters into the bearing will cause wear of bearing would reduce its service life seriously,which would further reduce the service life of the rotating liner hanger.Therefore,it is important to study the impact of the drilling flow on the erosion of the bearing.The drilling flow is considered solid-liquid two-phase flow.Currently the research of erosion characteristics under solid-liquid two-phase is still in early stage.Therefore,in order to improve the bearing serve life in this article,it is necessary to study he erosion characteristics under solid-liquid two-phase flow in rotary liner hanger bearing using numerical simulation.The concrete work content and the conclusion are as follows.1.In studying the erosion under multiphase flow,we used the micro cutting wear theory and calculated the erosion of the bearing of the rotary liner hanger under the solid-liquid two-phase flow.2.Drilling fluid entering into the interior of bearing causes erosion.This paper mainly studies the effects of inlet velocity,drilling fluid density,particle size and particle volume fraction on the wear of the bearing.3.We established a simplified model of the bearing fluid domain and simulated erosion rate of bearing using ANSYS CFX software.When the density of drilling fluid,particle size and particle volume fraction are constant,the maximum erosion rate increases with inlet velocity.When the volume concentration of solid phase,particle size and inlet velocity are constant,the maximum erosion rate increases with the density of drilling fluid.When the density of drilling fluid and the number of particle are constant,the maximum erosion rate increases with the size of particle.When the density of drilling fluid,particle size and inlet velocity are constant,the maximum erosion rate increases with volume concentration of solid phase.When the volume concentration of solid phase and the density of drilling fluid are constant,the size and number of particles influence the erosion rate.4.By changing different parameters of drilling fluid,we figured out that the part most susceptible to wear is shaft ring,followed by roller,retainer ring,seat ring.Through the research above,we get the rules between erosion rate and different parameters of the drilling fluid.It provides a basis for the fabrication of drilling fluid.By numerical simulation,we figured out that the part of the bearing most susceptible to wear,which provides some directions for improving the bearing structure.