Numerical simulation of the thermal-hydraulic coupling in wellbore and random fracture network reservoirs

被引：0
|
作者：
Shan D. [1 ,2 ]
Yan T. [1 ,2 ]
Li W. [1 ,2 ]
Sun S. [1 ,2 ]
Lu G. [1 ,2 ]
Zhao H. [1 ,2 ]
机构：
[1] College of Petroleum Engineering, Northeast Petroleum University, Daqing, 163318, Heilongjiang
[2] Key Laboratory of Enhanced Oil Recovery, Ministry of Education, Northeast Petroleum University, Daqing, 163318, Heilongjiang
来源：
Natural Gas Industry | 2019年 / 39卷 / 07期
关键词：
COMSOL Multiphysics; Enhanced geothermal system; Output and life; Random fracture network; Recovery temperature; Thermal mining rate; Thermal-hydraulic coupling; Wellbore;
D O I：
10.3787/j.issn.1000-0976.2019.07.019
中图分类号：
学科分类号：
摘要：
The seepage and heat transfer channel of enhanced geothermal system (EGS) is mainly composed of the wellbore of injection and production wells and the random fracture network reservoirs. For more accurate evaluation of the performance indexes of EGS (e.g., output and life), the thermal-hydraulic coupling of wellbore and random fracture network reservoir was numerically simulated. Based on the commercial finite element software COMSOL Multiphysics, the coupling solution of seepage field and temperature field of wellbore and reservoir was conducted, and the factors affecting the recovery temperature and thermal mining rate of EGS were analyzed. The opening length (L0) of injection/production wells had an important effect on the productivity and life of EGS. The optimum opening length is 400 m, and its corresponding EGS has the optimum output and life. Installing thermal insulation materials on the wellbore wall effectively increased the recovery temperature at the beginning and early stage of mining, reduced the heat loss, and improved the mining rate. As the mining goes, obvious low temperature zones occurred around the injection well and advanced to the production well along the fracture channel, and consequently the system will reach the recovery life and become exhausted. In this case, the thermal energy recovery shall be continued after stopping for a period of time. The influence of fracture permeability and thickness on the thermal mining rate is in positive correlation. The increase of parameter values led to the increase of thermal mining rate but the reduction of mining life.
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页码：143 / 150
页数：7
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