滨海新区西部馆陶组回灌井填砾成井工艺的应用分析  

Application of Gravel-packed Completion Technology of Guantao Geothermal Reinjection Well in the Western Binhai New Area

作　　者：江国胜[1] 王光辉[2] 赵娜[1] 黄贤龙[1] 沈健[1] 

机构地区：[1]天津地热勘查开发设计院,天津300250 [2]天津市国土资源和房屋管理局地质事务中心,天津300042

出　　处：《地质调查与研究》2014年第2期149-154,共6页Geological Survey and Research

基　　金：天津市滨海新区馆陶组热储回灌技术集成及示范研究(国土房任[2009]27号)

摘　　要：为了解决以往成井工艺存在的新近系储层回灌堵塞问题,根据热储条件,滨海新区西部25#地热回灌井采用大口径管外填砾的成井工艺。在施工重点工序上,一方面为了减小热储层的水流阻力,提高回灌量,25#回灌井采用下管前的破壁洗井和填砾前的正循环管外洗井,破坏井壁泥皮和清除渗入热储层中的稠泥浆,使过滤器周围形成一个良好的人工过滤层;另一方面总结以前填砾经验和教训,25#回灌井采用动水填砾,有效避免了填砾过程中的砾料膨胀与搭桥现象,保证了填砾安全到位。25#回灌井成井后进行了科研性回灌试验和生产性回灌试验,最大稳定灌量达66 m3/h,稳定动水位埋深71.37 m,回灌效果良好,而且后期回灌运行稳定,进一步验证了填砾成井工艺有利于回灌。In order to solve the clogging problems of reinjection well in Neogene geothermal reservoir, the drilling technology of gravel-packed completion technology outside the casing in large diameter well is taken in 25# reinjection well according to geothermal reservoir conditions in the Binhai New Area. For reducing flow resistance of the thermal reservoir and improving recharge amount, the well flushing for broken the mud wall before casing installed and direct well flushing outside the casing before gravel-packed method was adopted, which can damage the mud wall and clean out the viscous mud that have got into reservoir, so that the filter is formed a good artificial filter layer. And the dynamic water filling gravel was taken into the drilling of 25#, based on the experiences before, which can avoid gravel expansion and bridging phenomenon to ensure the gravel-packed in place. The reinjection and production tests have carried out separately. It indicates that the maximum recharge amount is 66 m3/h and the stable water level is 71.37 m. The test achieves a good reinjection effect. The operation of the system is running steady. This is a good verification that gravel-packed completion technology could make geothermal reinjection in sandstone reservoir easier.

关 键 词：地热 馆陶组回灌井 填砾成井工艺 破壁洗井 回灌试验 滨海新区 

分 类 号：P314.1[天文地球—固体地球物理学] P641.25[天文地球—地球物理学]