基于酸压改造的深层碳酸盐岩地热储层多场耦合机理及换热优化

IF 6.4 2区 工程技术 Q1 THERMODYNAMICS
Xinghui Wu, Peng Li, Shengjun Miao, Meifeng Cai, Yan Liu, Min Wang, Wensai Xiong
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引用次数: 0

摘要

深部碳酸盐岩热储的高效开发是地热资源利用的关键,但其低渗透和长期热衰减问题严重限制了其利用能力。以雄安新区D22井为例,建立了热-水-机-化(THMC)多场耦合数值模型。揭示了储层酸压改造后的换热机理和热衰减规律。研究表明,将酸性裂缝开度从0.08 m增加到0.12 m,渗透率提高35%,换热效率提高20%,但开度的增加加速了冷锋推进,导致裂缝闭合。确定了裂缝开度、井距、注入流量等主要控制参数,提出了“阶梯动态流量控制法”,以200→160→120 m3/h为阶梯调节流量,使温度衰减率降低42%,累计排热率提高18%。进一步设计的10-12毫米纳米气凝胶井筒热障涂层可减少15%的热损失,并在协同优化后将系统寿命延长2-3年。对于大型储层开发,建议采用“中等储层规模(3-4 km2)周期性补酸”来抑制边际效益递减。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Multi-field Coupling Mechanism and Optimization of Heat Transfer in Deep Carbonate Geothermal Reservoirs Based on Acid Fracturing Modification
Efficient development of deep carbonate thermal reservoirs is crucial for geothermal resource utilization, but their low permeability and long-term thermal decay problems seriously limit their capacity. Taking the D22 well in Xiongan New Area as an example, we constructed a multi-field coupled Thermo-Hydro-Mechanical-Chemical (THMC) numerical model. We revealed the heat exchange mechanism and heat attenuation law of the reservoir after acid fracturing and reforming. The study shows that increasing the acid fracture opening from 0.08 m to 0.12 m increases permeability by 35% and heat exchange efficiency by 20%, but the increase in opening accelerates the cold front advance and leads to fracture closure. The main control parameters of fracture opening, well distance, and injection flow rate were identified, and the "stepped dynamic flow rate control method" was proposed to adjust the flow rate in steps (200→160→120 m3/h), which reduced the temperature decay rate by 42% and increased the cumulative heat extraction by 18%. Further design of a 10-12 mm nano-aerogel wellbore thermal barrier coating reduces heat loss by 15% and extends system life by 2-3 years after synergistic optimization. For large-scale reservoir development, "medium reservoir size (3-4 km2) periodic acid recharge" is proposed to suppress the diminishing marginal benefits.
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来源期刊
Case Studies in Thermal Engineering
Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes
CiteScore
8.60
自引率
11.80%
发文量
812
审稿时长
76 days
期刊介绍: Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.
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