Geothermal development model of multilateral radial well and its heat extraction effect analysis based on thermal-hydraulic-mechanical coupling

被引：0
|
作者：
Wang T. [1 ]
Zhou X. [1 ]
Li G. [1 ]
Wang Y. [2 ]
Tian S. [1 ]
机构：
[1] State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum (Beijing), Beijing
[2] Engineering Research Center of Geothermal Resources Development Technology and Equipment, Ministry of Education, Jilin, Changchun
来源：
Natural Gas Industry | 2023年 / 43卷 / 03期
关键词：
Heat extraction power; Hot dry rock; Multilateral radial well; Natural fracture; Parameter analysis; Thermal stress; Thermal-hydraulic-mechanical coupling; Well layout parameter;
D O I：
10.3787/j.issn.1000-0976.2023.03.014
中图分类号：
学科分类号：
摘要：
The multilateral radial well geothermal development and extraction system is a new method for exploiting geothermal resources, which has the advantages of integrated single-well injection and production, large heat exchange area and strong communication ability. Well layout parameters and reservoir conditions are the key factors affecting the heat extraction effect of the system. A heat transfer model of multilateral radial well with a single main hole based on thermal-hydraulic-mechanical coupling is established, and its accuracy was verified. The heat extraction effect of a multilateral radial well was compared with that of a vertical well, and the influences of well layout parameters and natural fracture length on the heat extraction effect of the system were investigated. The thermal-hydraulic-mechanical coupling model showed that in the process of heat extraction, rocks undergo shrinkage deformation and fracture permeability increases significantly, but it promotes the invasion of cold front, which further intensifies the thermal breakthrough and shortens the heat extraction life of the system. Increasing the number of branch holes could enlarge the heat extraction area in the horizontal direction and communicate more natural fractures to keep higher heat extraction temperature and power. Among them, six branch holes is the optimal well layout number, and the optimal total heat extraction is 7.37×1015 J. The longer the lateral radial hole was, the slower the reservoir temperature dropped. The production temperature increased by 0.16℃ as the average length was increased by 1 m. Increasing well spacing slowed down the thermal breakthrough, improved the heat extraction efficiency, and extend the high-temperature heat extraction time. The optimal well spacing is 350 m, and the corresponding annual heat extraction power is 8.28 MW. The heat extraction power of the system decreased with the increase of the natural fracture length.
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页码：133 / 144
页数：11
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