More than 40 horizontal interconnected wells have been drilled in the Zhaoji area of Huai'an,and the drilling cycle has been decreasing year by year.As development progresses,the underground well network becomes denser,making it increasingly difficult to finely control the wellbore trajectory and improve the drilling rate of the nitrate layer.At present,there are problems such as difficult in extraction due to scarce remaining salt and nitrate resources,unclear spatial morphology of dissolution cavities leading to a high risk of channeling,mismatched drilling technology,and significant differences in drilling speed between wells.This paper summarizes the construction experience of drilled wells and integrates key technologies for fast drilling and completion of salt and nitrate wells in the Zhaoji Salt Mine,including cluster well layout technology,three-low trajectory control technology,cavity obstacle avoidance technology,short-radius sidetracking horizontal well technology,and saturated saltwater drilling fluid system technology,providing reference for speeding up and improving drilling quality in the Zhaoji Salt Mine in the future.
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