THERMAL SCIENCE

International Scientific Journal

Chengzheng Cai

,

Keda Ren

,

Jiangfeng Liu

,

Shuang Liu

NUMERICAL SIMULATION ON DOWNHOLE FLOW AND TEMPERATURE FIELDS DURING DRILLING WITH NITROGEN JET

ABSTRACT
In petroleum engineering, nitrogen drilling is an important technology for building wellbores between surfaces and reservoirs. To uncover the downhole flow field and the change rules of rock temperature during drilling with nitrogen jet, we constructed a CFD model by coupling the property equations of nitrogen. The flow fields of nitrogen jet and rock temperature distribution at different times were simulated. Results showed that the high speed nitrogen jet can be efficiently generated because of the nozzle acceleration and the impingement effect can be induced during drilling. The temperature of the nitrogen jet decreased due to the Joule-Thomson effect. This phenomenon suggested that the nitrogen jet induced additional thermal cracks on the bottomhole rock, which was very beneficial for the improvement of rock-breaking efficiency.
KEYWORDS
gas drilling, N2 jet, flow field, temperature field
PAPER SUBMITTED: 2018-07-10
PAPER REVISED: 2018-08-25
PAPER ACCEPTED: 2018-09-22
PUBLISHED ONLINE: 2019-03-31
DOI REFERENCE: https://doi.org/10.2298/TSCI180610085C
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 3, PAGES [S711 - S717]
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Numerical simulation on downhole flow and temperature fields during drilling with nitrogen jet

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence