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Energies 2018, 11(3), 489;

A Comparison of Thermal Models for Temperature Profiles in Gas-Lift Wells

Chinese Academy of Geological Sciences, No. 26 Baiwanzhuang Street, Beijing 100037, China
Petroleum Systems Engineering, University of Regina, Regina, SK S4S 0A2, Canada
Daqing Oilfield Exploration and Development Institute, Daqing 163712, China
Author to whom correspondence should be addressed.
Received: 26 January 2018 / Revised: 17 February 2018 / Accepted: 22 February 2018 / Published: 26 February 2018
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Gas lift is a simple, reliable artificial lift method which is frequently used in offshore oil field developments. In order to enhance the efficiency of production by gas lift, it is vital to exactly predict the distribution of temperature-field for fluid within the wellbore. A new mechanistic model is developed for computing flowing fluid temperature profiles in both conduits simultaneously for a continuous-flow gas-lift operation. This model assumes steady heat transfer in the formation, as well as steady heat transfer in the conduits. A micro-units discrete from the wellbore, whose heat transfer process is analyzed and whose heat transfer equation is set up according to the law of conservation of energy. A simplified algebraic solution to our model is conducted to analyze the temperature profile. Sensitivity analysis was conducted with the new model. The results indicate that mass flow rate of oil and the tubing overall heat transfer coefficient are the main factors that influence the temperature distribution inside the tubing and that the mass flow rate of oil is the main factor affecting temperature distribution in the annulus. Finally, the new model was tested in three various wells and compared with other models. The results showed that the new model is more accurate and provides significant references for temperature prediction in gas lift well. View Full-Text
Keywords: temperature profile; gas lift; governing equation; wellbore profile temperature profile; gas lift; governing equation; wellbore profile

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Mu, L.; Zhang, Q.; Li, Q.; Zeng, F. A Comparison of Thermal Models for Temperature Profiles in Gas-Lift Wells. Energies 2018, 11, 489.

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