含水层储层多能互补系统的采热效果数值模拟分析

Numerical Simulation Analysis of Thermal Recovery Effect of Multi Energy Complementary System in Aquifer Reservoirs

摘要:

构建了一种基于含水层储层的多能互补系统,分析了含水层多能互补系统的地层温度响应特征和产水井温度变化规律,探讨了回灌温度、井底压差和井间距对产水井温度的影响规律,最后通过响应面法分析了各因素的显著性。结果表明,该系统可有效延长地热井使用年限,并实现将波动性能量通过地层内的热量交换和平衡最终输出稳定能量的功能。提高回灌温度可减缓产水井温度的下降幅度,增大井底压差会缩短平衡产热时间并加速产水井温度下降,增大井间距导致产水井稳定时间延长并减缓产水井温度下降幅度。采用响应面分析方法,分析出4个因素对产水井水温影响的主次顺序为井间距＞井底压差＞回灌温度＞使用年限,交互作用中影响最大的为回灌温度与井间距。

Abstract:

A multi energy complementary system based on aquifer reservoirs was constructed, and the temperature response characteristics of the aquifer multi energy complementary system and the temperature variation law of the production well were analyzed. The influences of the reinjection temperature, bottomhole pressure difference, and well spacing on the temperature of the production well were explored. Finally, the significance of each factor was analyzed through the response surface methodology. The results indicate that the system can effectively extend the service life of geothermal wells and achieve the function of outputting stable energy by exchanging and balancing fluctuating energy through heat exchange within the formation. Increasing the reinjection temperature can slow down the decrease in temperature of the production well. Increasing the bottomhole pressure difference can shorten the equilibrium heat production time and accelerate the temperature drop of the production well. Increasing the well spacing can prolong the stability time of the production well and slow down the temperature drop of the production well. With the response surface analysis method, the primary and secondary order of the four factors affecting the water temperature of production wells was analyzed as: well spacing>bo-ttomhole pressure difference>reinjection temperature>service life. The interaction between reinjection temperature and well spacing had the greatest impact.