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恢复是保证增强型地热系统长期稳定的有效措施,本文以美国沙漠峰地热田为例,采用平行多裂隙模型对其进行采热-热恢复过程数值模拟研究。结果表明:热恢复过程初期温升迅速梯度大,后期明显减慢。热恢复的主要影响因素为热恢复温度初场及热恢复时间周期。热储激发程度与流体流量共同决定了热恢复温度初场,二者对热恢复过程的影响效应与热开采过程相一致。换热单元体厚度、流体流量及采热-热恢复周期均与产出温度和热储寿命呈负相关。系统循环流量为100 kg/s、换热单元体厚度为100 m、采热-热恢复周期为5年时,热储寿命达34.0年,较连续开采延长11.9年。
Recovery is an effective measure to ensure the long-term stability of the enhanced geothermal system. Taking the geothermal field in the Desert Summit of the United States as an example, this paper uses the parallel multi-fracture model to simulate the heat recovery and heat recovery process. The results show that the temperature rise rapidly increases rapidly in the early stage of heat recovery and slows down in the later period. The main influencing factors of heat recovery are the initial period of heat recovery temperature and heat recovery time period. The degree of thermal storage excitation and fluid flow together determine the initial field of thermal recovery temperature, the impact of the two on the thermal recovery process consistent with the thermal recovery process. Heat transfer unit body thickness, fluid flow and heat recovery - thermal recovery cycle are negative correlation with output temperature and thermal storage life. The system circulation flow rate is 100 kg / s, the thickness of the heat exchange unit is 100 m, the heat storage-heat recovery period is 5 years, and the thermal storage life is 34.0 years, which is 11.9 years longer than the continuous mining.