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考虑热流固耦合干热岩储层热提取解析模型
樊冬艳,孙海,姚军,严侠,张凯,张建光,张林
(中国石油大学(华东)石油工程学院,山东青岛 266580)
摘要:
干热岩储层热开采是一个典型的多物理场耦合问题,基于离散裂缝网络模型建立考虑热流固耦合干热岩储层解析模型,其中离散裂缝网络中只考虑裂缝中水的流动,水通过热对流方式进行热交换,基岩通过热传导对裂缝中的水进行加热;其次考虑水的黏度、裂缝的开度随温度及压力发生改变,利用Laplace变换求解得到离散裂缝网络模型下干热岩储层解析解;在此基础上总结复杂裂缝网络系统各裂缝的压力温度求解过程,并与TOUGH2数值结果对比,验证方法的正确性,分析不同影响因素对干热岩热提取过程的影响。结果表明:随着冷水注入,各裂缝水的黏度逐渐增加,出口端流量减小并趋于黏度不变时流量;而裂缝开度逐渐增加,出口端流量增加迅速;随着注入速度线性增加,生产井出口端温度逐渐减小,且减小幅度变缓,因此在干热岩热提取过程中,须综合考虑生产井出口端流量及温度的影响。
关键词:  干热岩  离散裂缝网络模型  热流固耦合  解析模型
DOI:10.3969/j.issn.1673-5005.2018.06.012
分类号::TK 521
文献标识码:A
基金项目:国家自然科学基金项目 (51504277,6,61573018,1);中央高校基本科研业务费专项(16CX05018A,17CX02008A)
An analytical thermo-hydraulic-mechanical coupled model for heat extraction from hot-dry rock reservoirs
FAN Dongyan, SUN Hai, YAO Jun, YAN Xia, ZHANG Kai, ZHANG Jianguang, ZHANG Lin
(School of Petroleum Engineering in China University of Petroleum (East China), Qingdao 266580, China)
Abstract:
An analytical thermo-hydraulic-mechanical coupled model was built in this study to investigate the heat extraction process from dry-hot rock reservoirs. It is assumed that the rock matrix is impermeable with heat conduction only, while water flow is confined within a discrete fracture network (DFN), in which both heat conduction and convection need to be considered. The coupled model was solved via a Laplace transform method, and the viscosity of water and the aperture of the fractures were considered as a function of temperature and pressure. The distribution of pressure and temperature in the complex fracture network system was calculated, and the results were verified in comparison with the TOUGH2 numerical solution. The influences of different factors were analyzed during the heat extraction. The calculation results show that the viscosity of water in the fractures increases gradually during cold water injection, and its flow rate at the outlet decreases initially, and then tends to be stable as in the case with a constant water viscosity. The fracture aperture also increases gradually during cold water injection, and the flow rate of water increases rapidly. When the injection rate increases linearly, the temperature of the produced water decreases gradually. Therefore it is necessary to consider the influence of water flow rate on its outlet temperature in order to increase the heat extraction rate and efficiency from dry hot rock reservoirs.
Key words:  hot-dry rock  discrete facture network model  thermo-hydraulic-mechanical coupled model  analytic model
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