| Hydrajet fracturing is a new technology which combines hydraulic jet perforation and hydraulic fracturing. It has obvious advantages on oil well production stimulation. As the down-hole hydrajet fracturing tool is an important tool in hydrajet fracturing, its jet flow property on flowfield inside and outside is necessary to be studied. In the practical application, a jetting tool is apt to be worn that makes it a short life.This problem has serious prejudice on the further spread of hydrajet fracturing techonology, so it has positive significance to research the worn phenomena about jetting tool.Numerical simulation studies on jetting tool of hydrajet fracturing tools with Computational Fluid Dynamics software ANSYS CFX are carried out in this paper, and the different influences on flow field for different nozzle location are compared. The abrasion mechanism on nozzle of hydrajet fracturing tools is analyzed. Numerical simulation study on the phenomena about worn of a nozzle is carried out by using explicit formulation dynamic finite element analysis software ANSYS/LS-DYNA to analyze the effection of a sand’s lash on life of the nozzle.The researches in this paper mainly have results as follow:(1) The Hydrajet fracturing mechanism is analysed.(2)Three-dimensional numerical simulation method on flow field inside and outside of jetting tool is carried out,and the flow characteristics is got.(3) By simulating the flowfiled inside jetting tools, different influences on jet by different nozzle locations and different distribution mode in multi nozzles are compared. Optimized structure schemes of jetting tools is proposed.(4) Analysis about abrasion mechanism on nozzle is achieved.(5)By stress analysis of sand-nozzle impacting with finite element method, the affecting factors of nozzle’s using life are indicated, which underlies the optimum of nozzle structure. |
PDF Full Text Request