石油钻采工艺2025，Vol.47Issue(6)：704-711,8.DOI:10.13639/j.odpt.202508001
塔里木盆地台盆区石炭系盐膏层套管损坏机理及防治对策
Mechanism and countermeasures for casing failure in carboniferous salt-gypsum formation in the platform-basin transitional area,Tarim basin
摘要
Abstract
Frequent casing failure incidents during drilling through the Carboniferous salt-gypsum formations in the platform-basin transitional area in the Tarim Basin have severely compromised drilling safety.To address the unclear mechanisms and lack of effective preventive measures for casing failure in this region,this study analyzed the characteristic patterns of typical casing failure cases based on drilling,logging,and mud logging data.Dominant factors for casing failure in salt-gypsum formations were identified,and a mechanical model was established for casing failures in such formations.This model was used to quantitatively assess the impact of parameters such as the lower suspended casing length,hole diameter enlargement rate,and casing centralization degree on casing safety factors.The research revealed that the casing failure mechanism in this area is the synergistic effect of hard mudstone pivot points,salt dissolution-induced hole enlargement,and eccentric loading,ultimately leading to casing buckling failure.Based on calculations from the mechanical model,three optimization measures were proposed:optimizing wellbore configuration by extending the intermediate casing setting depth of the second spud section to the lower boundary of the salt-gypsum formation and sealing the layer with large-diameter and high-strength casing;regulating drilling fluid properties to control salt rock dissolution rate,reduce hole diameter enlargement rate,and ensure wellbore regularity;and,performing reaming before running casing,and installing centralizers above the casing section sealing the salt formation to improve casing centralization degree.Field applications in four new wells demonstrated that implementing this technical solution reduced the casing failure incident rate to zero,significantly enhancing drilling safety and economic efficiency.The research findings provide crucial theoretical support and technical guidance for the safe drilling of deep salt-gypsum formations.关键词
塔里木盆地/石炭系/盐膏层/套管损坏/损坏机理/井身结构优化Key words
Tarim Basin/Carboniferous/salt-gypsum formation/casing failure/casing failure mechanism/wellbore configuration optimization分类
能源科技引用本文复制引用
LI Ji,LU Yunhu,WEI Shiming,CHENG Xiaolong,YANG Chengxin..塔里木盆地台盆区石炭系盐膏层套管损坏机理及防治对策[J].石油钻采工艺,2025,47(6):704-711,8.基金项目
国家自然科学基金企业创新发展联合基金项目"复杂环境下水泥环全生命周期密封理论与控制方法"(编号:U22B6003). （编号:U22B6003）
