石油钻采工艺2025，Vol.47Issue(3)：296-303,8.DOI:10.13639/j.odpt.202505022
超深盐井系列井筒事故分析及防范技术
Analysis and prevention techniques for a series of accidents in the ultra-deep salt wells
摘要
Abstract
The Ningjin salt field in Hebei Province is characterized by unfavorable geological conditions,including significant burial depth,a high number of interlayers,and elevated creep strength.Conducting an in-depth analysis of the series of wellbore accidents that occurred during the well Z cavity creation test can facilitate the optimization of subsequent drilling plans in this area.Drawing upon data from well opening,logging,cavity creation,and cavity measurement obtained on-site at the Ningjin Salt Cavern Construction Project,we introduce theoretical foundations such as interlayer collapse mechanisms,field vibration effects of the cavity center tube,creep-induced bottom bulging and top subsidence mechanisms in salt caverns,and casing shear-compression and tensile fracture mechanisms.These theoretical foundations are cross-verified with formula analysis,numerical simulation results,and engineering detection data to analyze the causes of wellbore accidents.Research indicates that logging resistance is associated with the rapid dissolution of thin interlayers,leading to the formation of"steep slopes"in the wellbore wall.The primary cause of central tube instability is the field vibration effect of the pipe string,followed by the longitudinal compression effect resulting from creep-induced arching at the cavity bottom.Casing damage is linked to axial tensile strain caused by creep and subsidence at the cavity top,a process further exacerbated by the field vibration effect of the central tube.The research findings offer improvement suggestions in areas such as drilling and cementing design,wellbore string and cavity stability design,as well as cavity shape control,serving as a technical reference for similar salt cavern drilling designs.关键词
盐穴储气库/夹层垮塌/造腔管柱/盐腔蠕变/套管应力Key words
salt cavern gas storage/interlayer collapse/cavity-making pipe string/salt cavity creep/casing stress分类
天文与地球科学引用本文复制引用
侯秉仁,牛耀辉,上官拴通,高亮,于长富,赵岩..超深盐井系列井筒事故分析及防范技术[J].石油钻采工艺,2025,47(3):296-303,8.基金项目
河北省重点研发计划项目"宁晋超深盐穴储气库建设关键技术研究与应用"(编号:21374101D). （编号:21374101D）
