黑龙江科技大学学报2025，Vol.35Issue(5)：760-766,7.DOI:10.3969/j.issn.2095-7262.2025.05.011
岩石CO2水热原位致裂器热功交换机制与应用
Thermal power exchange mechanism and application of rock CO2 hydrothermal in-situ cracker
摘要
Abstract
This paper seeks to improve the permeability and pressure relief effect of the coal seam with low permeability and high stress,and address the poor penetration effect between hydraulic fracture and natural fracture network produced by hydraulic fracturing.Based on the advantages of low viscosity and good fluidity of CO2,the study involves developing a rock supercritical CO2 fracturing device;studying the changing law behind hydrothermal fluid in the fracturing device under different CO2 temperature conditions on the temperature and 60℃water as the heat-transfer fluid,flow rate and heat work of the supercritical CO2;and verifying the reliability of CO2 fracturing device by experimental analysis.The results show that with the increase of CO2 temperature from 5℃to 25℃,the temperature of CO2 is negatively correlated with the temperature of hydrothermal fluid.The phase change heat absorption of CO2 has a great influence on the flow rate.As the initial temperature of CO2 increases,the heat transfer of CO2 also increases,and the heat transfer coefficient of hydrothermal fluid decreases from 714 W/(m2·K)to 359 W/(m2·K);and the thermal work of CO2 increases from 22.74 kJ to 23.61 kJ,the TNT energy carried by CO2 increases from 855.23 kJ to 1 114.85 kJ,indicating that the initial temperature of CO2 has a linear relationship with thermal work and TNT energy.The field test shows that the thermal power exchange of CO2 at different tem-peratures and volumes plays an important role in the crack propagation of fractured coal rock.关键词
超临界CO2/水热流体/热功交换/相变致裂/CFDKey words
supercritical CO2/hydrothermal fluid/thermal power exchange/phase transition fractu-ring/CFD分类
能源科技引用本文复制引用
陈万胜,邓广哲,高亮,蔚斐,王守印,袁超..岩石CO2水热原位致裂器热功交换机制与应用[J].黑龙江科技大学学报,2025,35(5):760-766,7.基金项目
陕西省自然科学基础研究计划项目(2019JLP09) （2019JLP09）
新疆生产建设兵团重点领域科技攻关计划项目(2019AB001) （2019AB001）
