干热岩压裂储层布井方式优选数值模拟  

Optimization of pattern of well in hot dry rock fractured reservoirs through numerical simulation

作　　者：张立刚[1] 胡志楠 范森[1] 罗晓雷 丁河嘉 马媛媛[1] 李庆龙 宋永扬 ZHANG Ligang;HU Zhinan;FAN Sen;LUO Xiaolei;DING Hejia;MA Yuanyuan;LI Qinglong;SONG Yongyang(School of Petroleum Engineering,Northeast Petroleum University,Daqing Heilongjiang 163318,China;Fushun Vocational Technical Institute,Fushun Liaoning 113122,China)

机构地区：[1]东北石油大学石油工程学院,黑龙江大庆163318 [2]抚顺职业技术学院,辽宁抚顺113122

出　　处：《地质科技通报》2024年第3期1-11,共11页Bulletin of Geological Science and Technology

摘　　要：增强型地热系统(EGS)是从干热岩储层中提取热能的重要手段,而布井方式是影响其采热效果的关键因素,目前开展的布井方式研究较少考虑压裂储层开采模型的影响。建立了干热岩压裂储层采热的数值模型,通过不同位置的基质岩体温度下降幅度、热提取率、采出温度和采热功率对比分析了4种不同的布井方式对EGS采热性能的影响。结果表明:相较于直井,水平井的流体热交换的面积更大,能充分开发裂缝间的热量。在生产30 a时,考虑水力压裂裂缝连通的情况下,水平井一注两采模型的采热效率最高,其在垂直于井方向上温度波及范围约690 m,基质岩体平均温度下降38.09 K,热提取率为24.42%,采热功率为3.5 MW。研究成果为提高地热系统产热量、实现干热岩高效可持续开发提供了理论参考。[Objective]An enhanced geothermal system(EGS)is a crucial means of extracting thermal energy from hot dry rock reservoirs,and the pattern of well plays a key role in influencing heat extraction efficiency.Currently,there is limited research on pattern of well considering fractured reservoir exploitation models.[Methods]This paper establishes a numerical model for heat extraction from hot dry rock fractured reservoirs and analyses the impact of four different patterns of wells on EGS heat extraction performance through a comparative analysis of the temperature decrease of the bedrock,heat extraction rate,production temperature,and heat extraction power.[Results]The results indicate that,compared to vertical wells,horizontal wells have a larger area for fluid heat exchange,allowing for more efficient heat development between fractures.After 30 years of production,considering the case of hydraulic fracturing fracture connectivity,the one injection and two production schemes of horizontal wells exhibit the highest heat extraction efficiency.In the vertical well direction,the temperature influence range is approximately 690 m,with an average temperature decrease of 38.09 K in the bedrock,a heat extraction rate of 24.42%,and a heat extraction power of 3.5 MW.[Conclusion]The research results provide a theoretical reference for enhancing the heat production of geothermal systems and achieving efficient and sustainable development of hot dry rock resources.

关 键 词：干热岩 压裂储层采热 增强型地热系统(EGS) 数值模拟 布井方式 水平井 敏感性分析 

分 类 号：P314.2[天文地球—固体地球物理学]