THERMAL SCIENCE

International Scientific Journal

Thermal Science - Online First

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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 N2 jet, we constructed a computational fluid dynamics model by coupling the property equations of nitrogen. The flow fields of N2 jet and rock temperature distribution at different times were simulated. Results showed that the high-speed N2 jet can be efficiently generated because of the nozzle acceleration and the impingement effect can be induced during drilling. The temperature of the N2 jet decreased due to the Joule-Thomson effect. This phenomenon suggested that the N2 jet induced additional thermal cracks on the bottomhole rock, which was very beneficial for the improvement of rock-breaking efficiency.
KEYWORDS
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
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