平顶山盐穴储气库固井技术

平顶山盐穴储气库含盐地层厚度大，目的层埋藏深，泥岩夹层多，固井难度大、要求高。在分析前期固井施工过程中存在的易漏失、胶结质量差、未返出井口等难题的基础上，通过开展有针对性的盐水水泥浆配方优选、井眼准备、前置液优化、钻井和下套管施工等综合性技术措施的研究，保障了固井顺利施工和固井质量。PT1井是平顶山盐穴储气库的一口探井，该井生产套管一次封固井段长，井眼尺寸大，井筒条件复杂，通过采用综合性能好的抗盐水泥浆体系，避免了固井期间漏失问题的发生，解决了平顶山盐穴储气库固井难题，为该地区后续的固井施工提供了宝贵经验。

Cementing technology suitable for Pingdingshan salt cavern gas storage

Pingdingshan salt cavern gas storage is characterized by thick salt formations, deep targets and multiple mudstone interbeds, so its cementing job is difficult and shall meet more requirements. The difficulties that occurred during the previous cementing were analyzed, such as circulation loss, poor cementation quality and no slurry returning to the wellhead. Then, a series of comprehensive measures were specifically studied to guarantee the smooth cementing and cementing quality, including brine cement slurry formula optimization, borehole preparation, prepad fluid optimization, well drilling and casing running. Well PT1 is an exploration well in Pingdingshan salt cavern gas storage. In this well, the single-stage cementing section of production casing is long, borehole size is large and wellbore conditions are complex. Its circulation loss during cementing is avoided by adopting salt-resisting cement slurry system whose comprehensive performance is good and adjusting and circulating the performance of drilling fluids sufficiently. And consequently, the cementing difficulties of Pingdingshan salt cavern gas storage are solved. The research results provide the valuable experience for the subsequent cementing operation in this area.