天津市中心城区老旧地热回灌系统技术改造方法探析

Exploration and analysis of technical transformation on the old geothermal reinjection systems in the central city of Tianjin

天津市中心城区部分地热回灌井运行时间较长,井下堵塞情况普遍,很多井的回灌效果出现了衰减现象。为了保证回灌井的回灌能力,可以采用酸化洗井、增加过滤设备等措施对老旧回灌系统进行技术改造。此措施能有效避免回灌物理堵塞,减缓回灌量衰减,提高回灌率、维护回灌井的持续有效运行,并能满足更高标准的两采一灌的回灌需求,从而为解决周边地热单井的地热尾水回灌需求创造有利条件。

Some geothermal reinjection wells in the central city of Tianjin have been used for a long time, and plugging is so general in the wells, even attenuation of reinjection result appeared in a lot of wells. In order to ensure the reinjection ability of the wells, we carried out technical transformation on the old geothermal reinjection systems by acidifying well, increasing filtration equipment and other measures. This can prevent physical plug of reinjection effectively, alleviate attenuationa of reinjection amount, increase the rate of recharge,maintain continued and effective operation of reinjection wells, and meet the reinjection needs of higher system which is formed by two production wells and one reinjection well. Thus, it creates favorable conditions for the reinjection of surrounding single well＇s geothermal tail water.