岩性油气藏 ›› 2025, Vol. 37 ›› Issue (5): 12–21.doi: 10.12108/yxyqc.20250502

• 新能源与伴生资源 • 上一篇    

多簇压裂条件下CO2-EGS干热岩水平井开发热-流-固三场耦合模型

杨永红1, 张世明1, 崔营滨1, 杨万芹1, 易红霞1, 刘巍1, 张立松2   

  1. 1. 中国石化胜利油田分公司 勘探开发研究院, 山东 东营 257015;
    2. 中国石油大学(华东)储运与建筑工程学院, 山东 青岛 266580
  • 收稿日期:2025-04-11 修回日期:2025-05-16 发布日期:2025-09-06
  • 第一作者:杨永红（1975—），男，硕士，高级工程师，主要从事地热资源评价与开发利用等工作。地址:（257015）山东省东营市东营区聊城路2号。Email:Yangyh.slyt@sinopec.com。
  • 通信作者: 张立松（1982—），男，博士，副教授，主要从事地热开发多场耦合理论研究工作。Email:lisongzhang1982@163.com。

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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摘要： 通过引入基岩控制方程、裂缝控制方程和热-流-固耦合关系，并借助COMSOL软件，开展了多簇压裂条件下CO2-EGS干热岩热储水平井开发数值模拟研究。研究结果表明：①建立的数学模型重构了热-流-固耦合关系，修正了裂缝孔隙度和渗透率与应力的函数关系，改进了CO2密度、黏度和比热容随压力与温度的变化关系。②考虑基岩、盖岩和围岩的热补偿作用，提出了多源热补偿模拟方法，据此建立了多簇压裂条件下CO2-EGS干热岩热储水平井开发数值模型。③通过数值模拟，讨论了干热岩的温度场、渗流场及应力场的演化规律，揭示了水平井井网、多簇压裂缝网的布局以及超临界CO2的性质直接影响CO2-EGS的演化过程。④CO2-EGS干热岩热储水平井开发的控制因素包括热-流-固（THM）三场耦合机制、水平井井网参数和多簇压裂缝网参数。THM三场耦合产出液质量流量相对于TH两场耦合提高了5.76%，但取热周期缩短了3.3 a；合理的水平井井网参数为一注两采，水平井长度为1 250 m，水平井井距为300 m；最优的缝网参数为缝间距75 m、缝宽3 mm、缝高40 m。

关键词: 干热岩, CO2-EGS, 热-流-固耦合, 水平井, 数值模型, 多簇压裂, 最大采热量

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

中图分类号: 

  • TE357.7
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