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Original Article | Open Access

Numerical model for geothermal energy utilization from double pipe heat exchanger in abandoned oil wells

China National Administration of Coal Geology, Beijing 100038, P. R. China
Schlumberger, Beijing 100015, P. R. China
Daqing Oilfield Production Engineering Research Institute, Daqing Oilfield, CNPC, Daqing 163713, P. R. China
DaZhou Administration of Emergency Management, Dazhou 635000, P. R. China
Strategic Research Center of Oil and Gas Resources, NMR, Beijing 100034, P. R. China
Department of Geology and Geography, West Virginia University, Morgantown 26506, USA
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Abstract

The number of abandonded wells are increasing in the late period of oilfield development. The utilization of these abandonded oil wells is promising and environment-friendly for geothermal development. In this study, a numerical model for geothermal heating is derived from a double pipe heat exchanger in abandoned oil wells. The main influencing factors of injection rate, injection time, and the types of filler in casing annulus on temperature profiles and outlet temperature have been considered in this model. The influences of injection rate on heat-mining rate are then discussed. Results show that the double pipe heat exchanger can gain higher temperature at the outlet when the casing annulus is filled by liquid other than dry cement under the given parameter combination. The outlet temperature decreases with the increase in injection rate and injection time. The temperature rapidly decreases in the first 40 days during the injection process. The balance between heat mining rate and outlet temperature is important for evaluating a double pipe heat exchanger in abandoned oil wells. This work may provide a useful tool for a field engineer to estimate the temperature of liquid in wellhead and evaluate the heat transfer efficiency for double pipe heat exchanger in abandoned oil wells.

Keywords

Geothermal energyheat transfercasing annulusnumerical model

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Advances in Geo-Energy Research
Volume 5 Issue 2,
June 2021
Pages 212-221
DOI: 10.46690/ager.2021.02.10
Cite this article:
Lin Z, Liu K, Liu J, et al. Numerical model for geothermal energy utilization from double pipe heat exchanger in abandoned oil wells. Advances in Geo-Energy Research, 2021, 5(2): 212-221. https://doi.org/10.46690/ager.2021.02.10

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Received: 25 March 2021
Revised: 17 April 2021
Accepted: 18 April 2021
Published: 22 April 2021
© The Author(s) 2021

This article is distributed under the terms and conditions of the Creative Commons Attribution (CC BY-NC-ND) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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