天津地区新近系地热回灌井不同完井工艺应用效果对比

Reinjection effect study of different geothermal well completion in Neogene System

针对新近系地层国内外普遍存在回灌效率低的问题,通过对滤水管和射孔两种不同完井工艺对回灌效果的影响入手,开展两种完井工艺地热回灌的试验研究。研究表明,在地层沉积环境和地层参数相同的情况下,射孔完井工艺回灌量大,回灌持续性好,不易产生堵塞,比滤水管完井工艺效果显著,对提高新近系地热回灌井的回灌效率具有明显的促进作用。

Based on the low geothermal reinjection efficiency in Neogene System allover the world, The article describes the two successful geothermal reinjection example in Neogene sandstone aquifer in Huan- ghua depression and Jizhong depression. Two well completion, i.e. the filter and perforation are applied in the two projects. Under similar sedimentation environment and parameter of the strata the perforation completion is more effective than the filter completion in larger reinjection volume and consistent reinjec- tion without blocking.