Erosion Behavior Of Solid Particles On Pipe Wall In Non-newtonian Fluid

As a kind of non-Newtonian fluid,hydroxypropylguar gum solution is widely utilized in fracturing and perforating operations.Proppant particles carried in the fracturing fluid can impact the pipeline,resulting in erosion of the inner pipe.In a result,the erosion of the bending and reducing sections are much larger than that of the ordinary straight pipe.Long-term erosion of solid particles causes the pipe wall to become thinner,which will reduce the strength of the pipe and bring dangers to the service safety of the pipe.Non-Newtonian fluids have a high application prospect in the petrochemical industry.However,there are few investigation for the erosion behavior in these fluids.Therefore,it is necessary to conduct in-depth research on the sand-carrying erosion of non-Newtonian fluids during pipe flow.In this work,particle erosion behavior in non-Newtonian hydroxypropylguar gum solution was investigated.Firstly,the CFD method was used to study the jet erosion situation in the non-Newtonian hydroxypropylguar gum solution.At the same time,it was compared with the erosion behavior of particles in fresh water,and the reliability of the numerical simulation method was verified through jet erosion experiments.Compared with fresh water,in the central area of the jet impact,the number of particles in the hydroxypropylguar gum solution hitting the wall of the material was less,the impact velocity and angle were smaller.The above-mentioned factors caused the erosion rate of particles in hydroxypropylguar gum solution was lower than that in the fresh water.The erosion prediction results of DNV,Oka and E/CRC Zhang models were compared with the experimental results.Comparison results shown that the results predicted by E/CRC Zhang model were close to the experimental values.The above results shown that within the range of the experimental conditions,E/CRC Zhang model is the preferred erosion model for predicting the erosion of solid particles in non-Newtonian hydroxypropylguar gum solutions.Secondary,the erosion behavior in duct of non-Newtonian fluid were investigated.Two typical geometric structures the reducing and elbow sections were selected.The effects of particle size,flow velocity,sand content and fluid properties on the particle impact behavior were studied by CFD method.The erosion rate increased with the increase of flow velocity and sand content.However,due to the special situation of fluid stagnation zone in the reducing section,the erosion rate decreased with the increase of particle diameter.In the elbow section,the erosion rate increased with the increase of velocity,particle diameter and sand content.As the fluid was fresh water,the erosion rate of the reducing section and elbow section was greater than that of the hydroxypropylguar gum solutions.Finally,the numerical simulation results were verified by a flow loop erosion experiments at different flow velocities.By comparing the experimental data with three different erosion models,the prediction model suitable for the study of pipe flow erosion was selected.The results shown that among the erosion models of DNV,Oka and E/CRC Zhang,DNV model were close to the experimental results,which was more suitable for predicting the erosion behavior of solid particles on the pipe wall under the condition of pipe flow.This study provides a reference for the study of particle flow in non-Newtonian fluid,and also provides a certain research idea for the prediction of solid particle erosion in non-Newtonian fluid.