Effects of carbon dioxide blasting on hot dry rock reservoirs considering thermal damage

IF 3.5 2区 工程技术 Q3 ENERGY & FUELS
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Abstract

A cutting-edge technique for igniting hot dry rock (HDR) reservoirs is carbon dioxide blasting. The cooling effect of the drilling fluid was taken into consideration during a numerical simulation of the action range of carbon dioxide blasting-induced cracking. A temperature difference was used to determine the reservoir's material properties. Additionally, temperature distribution functions were used to create the temperature field in the reservoir. The blasting load is calculated using the pertinent theories and formulas of explosive blasting, and the process of blasting carbon dioxide to excite the HDR reservoir is modeled using COMSOL. The findings show that several stress concentrations take place during the blasting process. The fracture zone is created by the tensile stress concentration outside of the crushing zone, whereas the compressive stress concentration close to the blast hole creates the crushing zone. Furthermore, the effectiveness of carbon dioxide blasting fracturing would be affected by the beginning temperature and pressure plate thickness. Although the scope of the fracture zone is mostly unchanged, the initial temperature has a significant impact on the blasting crushing zone. The size of the crushing zone, which determines how the blasting fracture zone is distributed, is unaffected by the pressure plate's thickness.
考虑热损伤的二氧化碳爆破对干热岩储层的影响
二氧化碳爆破是点燃干热岩(HDR)储层的一项尖端技术。在对二氧化碳爆破诱发裂缝的作用范围进行数值模拟时,考虑了钻井液的冷却效果。温差用于确定储层的材料特性。此外,还使用温度分布函数来创建储层中的温度场。使用爆炸爆破的相关理论和公式计算爆破载荷,并使用 COMSOL 对二氧化碳爆破激发 HDR 储层的过程进行建模。研究结果表明,在爆破过程中会出现多种应力集中现象。破碎带以外的拉应力集中形成了断裂带,而爆破孔附近的压应力集中则形成了破碎带。此外,二氧化碳爆破压裂的效果会受到起始温度和压板厚度的影响。虽然断裂带的范围基本不变,但初始温度对爆破破碎带的影响很大。破碎带的大小决定了爆破压裂带的分布,但它不受压力板厚度的影响。
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来源期刊
Geothermics
Geothermics 工程技术-地球科学综合
CiteScore
7.70
自引率
15.40%
发文量
237
审稿时长
4.5 months
期刊介绍: Geothermics is an international journal devoted to the research and development of geothermal energy. The International Board of Editors of Geothermics, which comprises specialists in the various aspects of geothermal resources, exploration and development, guarantees the balanced, comprehensive view of scientific and technological developments in this promising energy field. It promulgates the state of the art and science of geothermal energy, its exploration and exploitation through a regular exchange of information from all parts of the world. The journal publishes articles dealing with the theory, exploration techniques and all aspects of the utilization of geothermal resources. Geothermics serves as the scientific house, or exchange medium, through which the growing community of geothermal specialists can provide and receive information.
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