Numerical simulation of oil shale in-situ mining using fluid-thermo-solid coupling

ZHANG Tiantong; LIU Zeyu; XIE Zhixian; LI Yubo; XUE Linfu

doi:10.3969/j.issn.1673-9736.2020.04.06

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世界地质(英文版) ›› 2020, Vol. 23 ›› Issue (4) : 247-254. DOI: 10.3969/j.issn.1673-9736.2020.04.06

论文

Numerical simulation of oil shale in-situ mining using fluid-thermo-solid coupling

ZHANG Tiantong, LIU Zeyu, XIE Zhixian, LI Yubo, XUE Linfu

作者信息 +

Numerical simulation of oil shale in-situ mining using fluid-thermo-solid coupling

ZHANG Tiantong, LIU Zeyu, XIE Zhixian, LI Yubo, XUE Linfu

Author information +

文章历史 +

摘要

For the in-situ gas-injection mining technology of oil shale by process, a numerical simulation method with flow-thermo-solid coupling is proposed in this paper. This method adopts separate simulations and step-by-step coupling simulation ideas combined with the advantages of the finite element method and the finite volume method. The numerical simulation of flow-thermo-solid coupling is decomposed into two parts:flow-solid coupling and thermo-solid coupling. Considering the Fuyu oil shale in-situ production test area in Songliao Basin as an example, it is concluded that the oil shale has undergone four heating stages:a rapid temperature rise, a steady temperature rise, a slow temperature rise, and heat preservation. It takes about 10 years for the stress-strain state of the oil shale layer to reach a steady-state through the thermo-solid coupling. The main strain zones of the oil shale layer are distributed near the fracturing fractures connected to the gas injection well and at the edge of the fracturing fractures. The areas with the plastic deformation in the oil shale layer predominantly appear near the gas injection wells, production wells, and fracturing channels. The areas with the largest fracture strength are mostly distributed near the edge of the fracturing fractures with low flow velocity and low temperature.

Abstract

导出引用

ZHANG Tiantong, LIU Zeyu, XIE Zhixian, LI Yubo, XUE Linfu. Numerical simulation of oil shale in-situ mining using fluid-thermo-solid coupling[J]. 世界地质(英文版). 2020, 23(4): 247-254 https://doi.org/10.3969/j.issn.1673-9736.2020.04.06

ZHANG Tiantong, LIU Zeyu, XIE Zhixian, LI Yubo, XUE Linfu. Numerical simulation of oil shale in-situ mining using fluid-thermo-solid coupling[J]. Global Geology. 2020, 23(4): 247-254 https://doi.org/10.3969/j.issn.1673-9736.2020.04.06

参考文献

Jiang P F, Sun Y H, Guo W, et al. 2015. Heating technology and heat transfer simulation for oil shale of in-situ pyrolysis by fracturing and nitrogen injection. Journal of Northeastern University (Natural Science), 36(9):1353-1357,1368.(in Chinese with English abstract)
Kang Z Q, Yang D, Zhao Y S, et al. 2008. Physical principle and numerical analysis of oil shale development using in-situ conversion process technology. Acta Petrolei Sinica, 29(4):592-595.(in Chinese with English abstract)
Li J, Tang D Z, Xue Q H, et al. 2014. Discussion of oil shale in-situ conversion process in China. Journal of Southwest Petroleum University (Science & Technology Edition), 36(1):58-64. (in Chinese with English abstract)
Li K. 2011. Research on thermal-hydrological-mechanical coupling mode for oil shale in-situ exploitation and hydrologic fracturing:master's degree thesis. Fuxin:Liaoning University of Engineering and Technology.(in Chinese with English abstract)
Li Y, Lin M, Zhao Z B. 2015. Numerical model of thermal-hydrological-mechanical coupling and its application. Chinese Journal of Hydrodynamics, 30(1):56-63.(in Chinese with English abstract)
Li Y B, Xue L F, Ma J X. 2018. Numerical simulation of porosity and permeability changes in in-situ of oil shale. Science Technology and Engineering, 18(34):43-50.(in Chinese with English abstract)
Liu Z Y. 2019. A coupled numerical simulation for oil shale in-situ Mining:master's degree thesis. Changchun:Jilin University.(in Chinese with English abstract)
Liu Z Y, Liu X Y, Niu M X, et al. 2019. Evaluation of temperature measurement errors of heating on oil shale in-situ. Global Geology, 38(2):448-453.(in Chinese with English abstract)
Ma J X, Xue L F, Zhao J M, et al.2019. Numerical simulation and design optimization of temperature field of oil shale in situ pyrolysis and exploitation. Science Technology and Engineering, 19(5):94-103.(in Chinese with English abstract)
Ma L, Yin X Y, Sun H, et al. 2012. Present status of oil shale resource utilization in the world and its development prospects. Global Geology, 31(4):772-777.(in Chinese with English abstract)
Qin H, Xu F P, Liu H P, et al. 2014. Thermal fragmentation characteristic of oil shale. Science Technology and Engineering, 14(13):26-30.(in Chinese with English abstract)
Qian J L, Yin L. 2008. Oil shale-Supplementary energy for oil. Beijing:Sinopec Publishing House,1.(in Chinese with English abstract)
Sun K M, Zhao Y S, Yang D, et al. 2008. Thermoelastoplastic damage model of heterogeneic medium and its application to thermal cracking analysis of oil shale in underground mining. Chinese Journal of Rock Mechanics and Engineering, 27(1):42-52.(in Chinese with English abstract)
Wang Q, Xu J, Ye J B, et al. 2017. Analysis and comparison of three pyrolysis kinetic models of Maoming oil shale in Guangdong Province. Science Technology and Engineering, 17(32):112-118.(in Chinese with English abstract)
Zhang X Q, Zhang L Y, Qian Y, et al. 2014. The effect of different demineralization ways on oil shale retort characteristics. Science Technology and Engineering, 14(1):10-13.(in Chinese with English abstract)