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Numerical simulation of flow field of nozzle with elliptical exit under submerged condition
ZHOU Wei-dong1, LI Luo-peng1, KONG Chui-xian2, WANG Jing-shuang1
(1.School of Petroleum Engineering in China University of Petroleum, Qingdao 266580, China;2.Research Institute of Exploration and Development, Xinjiang Oilfield Company, Karamay 834000, China )
Abstract:
In order to improve the reaming efficiency of radial horizontal well bore, the elliptical exit nozzle was introduced into the abrasive jet reaming technology. The Realizable κ-ε turbulence model was applied to the simulation of the nozzle with elliptical exit. Numerical results were compared with results of conical nozzle. The results show that the jet has a certain spreading and the diffusion angle on short shaft section is greater than that on the longitudinal profile. The jet velocity in the nozzle and the outlet velocity gradually decrease along with the length-width ratio increasing,while increase with the outlet diameter increasing. When the nozzle entrance velocity and outlet diameter are the same, the outlet axial velocity of the nozzle is less than that of the conical nozzle. When dimensionless nozzle distance is greater than 11.3, the jet velocity is greater than that of the conical nozzle. The nozzle export section width increases with the distance from nozzle increasing, and the reaming width of the elliptical exit nozzle is greater than that of conical nozzle under the same conditions. The jet has self-moldability. The numerical results agree well with the experimental results of abrasive jet reaming.
Key words:  jet  reaming  nozzle with elliptical exit  numerical simulation