| In order to reveal the influence of the distance between producing Wells on the enhanced geothermal system (EGS), a three-dimensional thermal-solid-fluid coupling thermal recovery model considering the different distances between producing Wells was established by numerical simulation with the enhanced geothermal system in Gonghe Basin, Qinghai Province, China as the research object. The effects of the distance between producing Wells of 600m, 700m, 800m, 900m and 1000m on EGS temperature field, production temperature, circulating mass flow rate, heat production rate, reservoir life and total heat production were analyzed. The results show that the production temperature of EGS is the same as the reservoir temperature in the early stage of thermal recovery. With the development of thermal mining, the temperature of rock mass around reservoir fractures decreases, and the output temperature from the 15th year decreases with the increase of mining life, thus achieving a thermal breakthrough. With the development of thermal mining, the flow rate of circulating working medium and the heat production rate decrease gradually, and the reduction range slows down gradually. By comparing different interwell distance models, it is found that when the interwell distance increases, the temperature of produced fluid, heat production rate, reservoir life, and total heat production gradually increase. |
