江苏如东县小洋口二叠系—志留系裂隙热储层回灌试验研究

Reinjection test of Permian-Silurian fracture thermal reservoirs in Xiaoyangkou, Rudong County, Jiangsu Province

中文关键词: 地热能  热储层  回灌性能  井间距

英文关键词: geothermal energy  thermal reservoir  reinjection performance  inter-well distance

中文摘要:

      针对江苏如东县小洋口 RRY-1地热井(二叠系—志留系裂隙型热储层)，本文以自来水为回灌水源，建立了一套回灌测试系统，开展了自然回灌和加压回灌方式下的回灌能力试验。结果表明，两次回灌试验的注水渗透系数分别为 0.11 m/d和 0.10 m/d，注水导水系数分别为 4.96 m2/d和 4.41 m2/d；当回灌水温度为 12 ℃和 30 ℃时，理论最大回灌量分别为 203.9 m3/d和 168.3 m3/d。随着稳定回灌量增加，水位回升数值先线性增加，然后呈指数增长趋势。评价了不同回灌量条件下，地热井的权益保护半径以及回灌井和开采井的最小井距，并给出了具体的回灌建议，对于地热资源可持续开发利用具有积极的指导作用。

英文摘要:

      Taking local tap water as water source, a set of geothermal water reinjection system was built for thegeothermal well RRY-1 with Permian-Silurian fracture thermal reservoirs located in Xiaoyangkou District, RudongCounty, Jiangsu Province. Reinjection tests were performed under natural and pressurizing conditions. Resultsshowed that for two groups of tests, the permeability coefficient was 0.11 m/d and 0.10 m/d, and the conductivitywas 4.96 m3/d and 4.41 m3/d, respectively. When the reinjection water temperature was 12 ℃ and 30 ℃, the maxi-mum reinjection amount was 203.9 m3/d and 168.3 m3/d, respectively. As the steady reinjection amount increased, the water level recovery first increased linearly, and then showed a rapid exponential growth trend. For different re-injection conditions, the interest protection radius and the minimum distance between the exploitation and reinjec-tion geothermal wells were evaluated and detailed suggestions were given. The above results can play an importantrole in the sustainable development of geothermal resources.