Inscrição na biblioteca: Guest
Portal Digital Begell Biblioteca digital da Begell eBooks Diários Referências e Anais Coleções de pesquisa
Atomization and Sprays
Fator do impacto: 1.262 FI de cinco anos: 1.518 SJR: 0.814 SNIP: 1.18 CiteScore™: 1.6

ISSN Imprimir: 1044-5110
ISSN On-line: 1936-2684

Volumes:
Volume 29, 2019 Volume 28, 2018 Volume 27, 2017 Volume 26, 2016 Volume 25, 2015 Volume 24, 2014 Volume 23, 2013 Volume 22, 2012 Volume 21, 2011 Volume 20, 2010 Volume 19, 2009 Volume 18, 2008 Volume 17, 2007 Volume 16, 2006 Volume 15, 2005 Volume 14, 2004 Volume 13, 2003 Volume 12, 2002 Volume 11, 2001 Volume 10, 2000 Volume 9, 1999 Volume 8, 1998 Volume 7, 1997 Volume 6, 1996 Volume 5, 1995 Volume 4, 1994 Volume 3, 1993 Volume 2, 1992 Volume 1, 1991

Atomization and Sprays

DOI: 10.1615/AtomizSpr.2014009706
pages 761-778

MATHEMATICAL MODELING AND EXPERIMENT ON PROPULSION OF THE MULTIJET BIT

Gang Bi
State Key Laboratory of Petroleum Resources and Prospecting
Gensheng Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, P.R. China
Dongjun Ma
Sinopec Research Institute of Petroleum Engineering, Beijing, 100101, P.R. China
Zhonghou Shen
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum 102249, Beijing, People's Republic of China
Zhongwei Huang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing 102249, PR. China
Jinbin Li
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, P.R. China
Ruiyue Yang
State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing, 102249, P.R. China

RESUMO

The multijet bit is a critical component of radial horizontal drilling technology, which not only has to break the rocks but also produce forward, self-propelled force to the high-pressure hose. The influence of structural parameters and hydraulic parameters on the rock-breaking efficiency of multijet bits was studied. Results show that the greater the number of holes of the jet bit, the more round the form of the borehole will be. As the lateral orifice diffusion angle increases, the rock-breaking efficiency first increases and then decreases. The working principle of the multijet bit was investigated and the mechanical control equations of the jet bit were established based on the momentum flux method. Furthermore, the impact of bottom hole pressure drop generated by a back jet on self-propelled force was also studied. From the experimental results, the flow rate, forward-reverse flow ratio of the jet bit, and the wellbore diameter are primary factors influencing the self-propelled force. Under experimental conditions, the self-propelled force increases with the increase of flow rate. With the same flow rate, the self-propelled force increases when the forward-reverse flow ratio decreases. The self-propelled force first increases and then decreases as the wellbore diameter increases. The self-propelled force ranges from 67.8 to 228.1 N.