缝网间距对高温岩体储留层温度影响规律模拟

doi:10.13278/j.cnki.jjuese.20180321

摘要/Abstract

摘要： 为研究高温岩体储留层注水过程中缝网间距对储留层岩体温度的影响规律，建立了考虑热对流和热传导效应的热流固耦合力学模型。以水平井多簇缝网地热开发为例，将缝网及其周围岩体简化为等效的多孔介质，利用ABAQUS二次开发功能实现了流固耦合和热对流耦合。模拟结果表明：储留层岩体温度的变化按注水持续时间分为3个阶段：初温保持阶段，该阶段储留层岩体温度保持原始温度，缝网间距的不同对储留层岩体整体温度无影响；快速降温阶段，该阶段储留层岩体温度下降随注水时间呈现负指数变化规律，缝网间距与储留层岩体温度呈正相关关系；温度缓慢下降平稳阶段，该阶段初期缝网间距与储留层岩体温度的关系和快速降温阶段一致，但后期缝网间距与储留层岩体温度呈负相关关系。空间上，在岩体温度高的区域，缝网间距越小，岩体温度变化梯度越大；在岩体温度较低的区域，缝网间距越小，岩体温度变化梯度越小。

关键词: 高温岩体储留层, 热流固耦合力学模型, 数值模拟, 缝网间距

Abstract: A T-H-M (thermal-hydraulic-mechanical) coupling mechanical model considering the effect of thermal convection and thermal conduction is built to study the influence of fracture-network spacing on temperature of reservoir rock mass during water injection for HDR geothermal reservoirs. Taking the horizontal well with multiple-fracture-network geothermal development as an example, the fracture-network and its surrounding rocks are regarded as an equivalent porous medium, the coupling of H-M coupling and thermal convection is achieved by the secondary development of ABAQUS. The simulation results show that the temperature change of the reservoir rock mass falls into three stages during water injection:in the initial temperature maintaining stage, the rock mass temperature remains initial, and there is no effect of different fracture-networks spacings on the temperature of overall reservoir rock mass; in the temperature rapid declining stage, the temperature decline of the reservoir rock mass shows a negative exponential with the water injection time, and the fracture-network spacings are positively correlated with the temperature of reservoir rock mass; the third stage is the temperature slow and steady declining stage, at the beginning of this stage, the relationship between the fracture-network spacings and the temperature of reservoir rock mass are consistent with that in the temperature rapid declining stage, however, at the end of this stage, the fracture-network spacings are negatively correlated with the temperature of reservoir rock mass. In space, the smaller the fracture-network spacing, the greater the gradient temperature changes of reservoir rock mass in the area where rock mass temperature is high; while the smaller the fracture-network spacing, the smaller the gradient temperature changes of reservoir rock mass in the area where rock mass temperature is low.

Key words: hot dry rock geothermal reservoirs, thermal-hydraulic-mechanical coupling mechanical model, numerical simulation, fracture-network spacing

中图分类号:

P341

孙可明, 张宇. 缝网间距对高温岩体储留层温度影响规律模拟[J]. 吉林大学学报(地球科学版), 2019, 49(6): 1723-1731.

Sun Keming, Zhang Yu. Simulation of Influence of Fracture-Network Spacing on Temperature of HDR Geothermal Reservoirs[J]. Journal of Jilin University(Earth Science Edition), 2019, 49(6): 1723-1731.

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