Lin, Zhongyue, Kang Liu, Jing Liu, Dandan Geng, Kai Ren, and Zhihong Zheng. “Numerical Model for Geothermal Energy Utilization from Double Pipe Heat Exchanger in Abandoned Oil Wells”. Advances in Geo-Energy Research 5, no. 2 (April 22, 2021): 212–221. Accessed June 13, 2026. https://www.astp-agr.com/index.php/2207-9963/article/view/162.