Optimal design and performance evaluation of a new hydrajet-fracturing nozzle
Author(s): TANG Jiren, LU Yiyu, OUYANG Mengdi, ZHANG Wenfeng, ZHANG Xinwei
Pages: 72-78
Year: 2015 Issue: 1
Journal: Journal of China University of Petroleum(Edition of Natural Science)
Keyword: jet fracturing; new nozzle; optimal design; numerical simulation;
Abstract: In order to solve the problems of large energy loss at the entrance and the short service life of the commonly used cone nozzles, a local energy loss formula at the nozzle entrance was established through the analysis of the energy loss at the entrance. A new nozzle with transition section was designed on the basis of the established formula. Also, the flow coefficient and flow velocity field of this new nozzle were measured by using numerical simulation and 3D-PIV technique. The results show that the energy loss at the new nozzle entrance decreases efficiently. For a 12. 7 cm casing, the best nozzle has the fol-lowing structures:the chamfer of transition section is 45° and the length is 2 mm. Compared with the commonly used nozzle, the energy loss at the new nozzle entrance decreases by 34%, the pressure difference between the up and down of entrance section reduces by 25%, the flow coefficient increases by 8%, and the flow axis velocity is improved by 16%.
Pages: 72-78
Year: 2015 Issue: 1
Journal: Journal of China University of Petroleum(Edition of Natural Science)
Keyword: jet fracturing; new nozzle; optimal design; numerical simulation;
Abstract: In order to solve the problems of large energy loss at the entrance and the short service life of the commonly used cone nozzles, a local energy loss formula at the nozzle entrance was established through the analysis of the energy loss at the entrance. A new nozzle with transition section was designed on the basis of the established formula. Also, the flow coefficient and flow velocity field of this new nozzle were measured by using numerical simulation and 3D-PIV technique. The results show that the energy loss at the new nozzle entrance decreases efficiently. For a 12. 7 cm casing, the best nozzle has the fol-lowing structures:the chamfer of transition section is 45° and the length is 2 mm. Compared with the commonly used nozzle, the energy loss at the new nozzle entrance decreases by 34%, the pressure difference between the up and down of entrance section reduces by 25%, the flow coefficient increases by 8%, and the flow axis velocity is improved by 16%.
Related Articles