Lithologic Reservoirs ›› 2025, Vol. 37 ›› Issue (5): 12-21.doi: 10.12108/yxyqc.20250502

• NEW ENERGY AND ASSOCIATED RESOURCES • Previous Articles    

Thermal-hydraulic-mechanical coupling model for development of CO2-EGS hot dry rock horizontal wells under multi-cluster fracturing condition

YANG Yonghong1, ZHANG Shiming1, CUI Yingbin1, YANG Wanqin1, YI Hongxia1, LIU Wei1, ZHANG Lisong2   

  1. 1. Exploration and Development Research Institute, Shengli Oilfield Company, Sinopec, Dongying 257015, Shandong, China;
    2. College of Pipeline and Civil Engineering, China University of Petroleum(East China), Qingdao 266580, Shandong, China
  • Received:2025-04-11 Revised:2025-05-16 Published:2025-09-06

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Abstract: Through the incorporation of bedrock governing equations，fracture governing equations，and thermal-hydraulic-mechanical（THM）coupling relationships，and aidded by COMSOL software，numerical simulation research on the development of CO2-EGS hot dry rock reservoirs via horizontal wells under multicluster fracturing conditions was conducted. The results show that：（1）The established mathematical model reconstructed THM coupling relationships，modified the functional relationships between fracture porosity/permeability and stress，and improved the variations of CO2 density，viscosity，and specific heat capacity with pressure and temperature.（2）Considering the thermal compensation effects of bedrock，cap rock，and surrounding rock，a multi-source thermal compensation numerical simulation method was proposed，and a numerical model for CO 2-EGS hot dry rock reservoir development via horizontal wells under multi-cluster fracturing conditions was established.（3）Using the numerical model，the evolutions of the temperature field，seepage field，and stress field of hot dry rock were discussed，revealing that the horizontal well patterns，the configuration of multicluster fracture networks，and the properties of supercritical CO2 directly influence the evolution process of CO2- EGS.（4）The controlling factors for CO2-EGS hot dry rock reservoir development via horizontal wells were identified as the THM coupling mechanism，horizontal well pattern parameters，and multi-cluster fracture network parameters. Compared with TH coupling，THM coupling increases the produced fluid mass flow rate by 5.76%， shortens the heat extraction period by 3.3 years. The reasonable horizontal well pattern parameters are one injection well and two production wells，with a horizontal well length of 1 250 m，and a well spacing of 300 m. While the optimal fracture network parameters are a fracture spacing of 75 m，fracture width of 3 mm，and fracture height of 40 m.

Key words: hot dry rock, CO2-EGS, THM coupling, horizontal well, numerical model, multi-cluster fractures, maximum heat recovery

CLC Number: 

  • TE357.7
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