雄安牛驼镇地热田岩溶热储层地热深井井身结构优化设计

雄安新区牛驼镇地热田主要储层为岩溶热储型，地层破碎、裂隙发育，钻进时多失返性漏失。以往的开发主要集中于1800m以浅，岩溶热储段长为300-500m，裸眼段较短，钻进施工较简单。为了加强对深部地热资源的探测，满足雄安新区规划建设的需求，开展了深部地热资源调查工作，主要目的层为雾迷山组和高于庄组，其存在的难点主要有岩溶热储层裸眼段长、地层破碎、长段漏失、上部地层稳定性差等。本文根据深部热储勘探井施工过程中钻遇问题及难点分析，对岩溶热储层深井钻进关键技术进行总结，提出了优化建议，具有一定的参考意义。

Optimization design of the geothermal wellbore structure in karst reservoir

The main reservoir of niutuo geothermal field in Xiongan new area is karst thermal. In the past, the development mainly concentrated on the shallow of 1800m, the length of karst reservoir is 300-500m which is short, and the drilling construction is simple. In order to strengthen the exploration of deep geothermal resources and satisfy the needs of the planning and construction of Xiongan new area, the investigation of deep geothermal resources was carried out, the main target strata being Wumishan formation and Gaoyuzhuang formation, the main difficulties are the long open-hole section of Karst Reservoir, the formation breakage, the long section leakage and the poor stability of the upper strata. Based on the analysis of drilling problems and difficulties encountered in the construction of deep thermal exploration wells, this paper summarizes the key techniques of deep well drilling in karst thermal reservoir, and puts forward optimization suggestions, which has certain reference significance.