AD401-7井定向井卡钻复杂事故的处理及分析

AD 4017 Directional well’s Processing and Analysis of Drilling Complex Accident

摘要:

AD4017井属于吐哈盆地鲁克沁油田ADI块构造。该区块在勘探开发初期极少出现因井下坍塌而发生的卡钻事故，AD4017井在井身结构设计时，参考的是前期地质勘探资料和邻井数据资料，未考虑到钻井过程中出现薄煤层夹层的情况，原有设计在该井段易导致井壁不稳，所以实际钻井过程中发生了卡钻事故。本文通过对AD4017井卡钻事故的研究，从地质因素、物理化学因素、工艺因素等几方面，深入分析了该井发生坍塌卡钻可能存在的原因及机理，并对这些原因导致的卡钻事故提出了针对性的预防措施和处理方法。

Abstract:

AD 4017 well, located Lukeqing oil field in Tuha basin, belong to I block structure in AD. There is rarely a precedent of drilling accident caused by downhole collapse in the early exploration and prospection of the block. The well structure design of AD4017 well，is designed by referencing the preliminary geological exploration data and design data of adjacent wells, It is not considered the situation that there is a thin coal bed in the drilling process. The original design is easy to lead to the instability of the well wall in this well, so the drilling accident occurred in the actual drilling process. The article through research of drilling stuck accident for AD 4017 well, deeply analysis the well collapse mechanism and reason of stuck may exist from the geological factors, physical and chemical factors, technology factors etc, which put forward preventive measures and treatment methods of pertinence for those factors lead to the sticking accident.