International Scientific Journal

Thermal Science - Online First

online first only

Establishment and application of heat flow coupling model

Wax deposition on walls of oil pipes is a common occurrence in crude oil extraction and is one of the major impediments to oilfield production. The most common method of paraffin removal is superconducting car thermal washing. This study proposes a heat flow coupling model that can analyze the temperature of the tubing-casing annular space to solve the low efficiency problem caused by adjusting initial parameters empirically. Using the superconducting car thermal washing process at the test oil well in Daqing as research object, the real-time temperature of annulus under various initial conditions is acquired by the fully-distributed Raman optical fiber temperature monitoring system. Compared with the real-time data, theoretical data has a maximum deviation of 5°C; this result verifies the accuracy of the model. Based on the model, the study investigates the optimal initial parameters of superconducting car thermal washing by taking effective depth as an optimization goal; the optimal parameters for oil wells with different working conditions are obtained to improve the effectiveness of paraffin removal and increase thermal efficiency. This study provides theoretical support and an inspection method to promote superconducting car thermal washing and paraffin removal as well as to improve productive efficiency.
PAPER REVISED: 2017-02-24
PAPER ACCEPTED: 2017-02-24
  1. Hosseinipour, A., et al., The Impact of the Composition of the Crude Oils on the Wax Crystallization, Proceedings, Applied Mechanics and Materials, 3rd International Conference on Process Engineering and Advanced Materials., Kuala Lumpur, Malaysia, 2014, Vol. 625, pp. 196-200
  2. Valinejad, R., Nazar, A. R. S., An experimental design approach for investigating the effects of operating factors on the wax deposition in pipelines, Fuel, 106(2013), 2, pp. 843-850
  3. Zhang, F., et al., Potential microorganisms for prevention of paraffin precipitation in a hypersaline oil reservoir, Energy Fuels, 28(2014), 2, pp. 1191-1197
  4. Zhang, F., et al., Paraffin Deposition Mechanism and Paraffin Inhibition Technology for High-carbon Paraffin Crude Oil from the Kazakhstan PK Oilfield, Petroleum Science and Technology, 32(2014), 4, pp. 488-496
  5. He, Y. W., Technical Research for Oil Well Variable Frequency Electromagnetic Field Paraffin Prevention, Proceedings, Applied Mechanics and Materials, 4th International Conference on Applied Mechanics, Materials and Manufacturing., Shenzhen, China, 2014, Vol. 670, pp. 313-317
  6. Wang, W., et al., Experimental Study on Mechanisms of Wax Removal During Pipeline Pigging, Proceedings, Society of Petroleum Engineers, SPE Annual Technical Conference and Exhibition., Houston, USA, 2015
  7. Danilović, D. S., et al., Solving paraffin deposition problem in tubing by heating cable application, Thermal science, 14(2010), 1, pp. 247-253
  8. Hasan, A. R., et al., Wellbore heat-transfer modeling and applications, Journal of Petroleum Science and Engineering, 86(2012), 3, pp. 127-136
  9. Izgec, B., Transient fluid and heat flow modeling in coupled wellbore/reservoir systems, Spe Reservoir Evaluation and Engineering, 10(2007), 3, pp. 294-301
  10. Fang Man., Research on temperature sensor system and temperature resolution enhancement of distributed Raman optical fiber, Master's thesis, University of Electronic Science and technology, Chengdu, China, 2004 (in Chinese)
  11. Cheng Guojuan., Study of heat fluid coupling during the process of circulation of warm liquid and temperature monitoring system, Master's thesis, Harbin Institute of Technology, Harbin, China, 2011 (in Chinese)
  12. He Jun., Research on some key technologies of distributed fiber sensing system, Ph. D. thesis, Harbin Institute of Technology, Harbin, China, 2010 (in Chinese)