湖南明月峰地区水力割刀使用问题研究

Research on the use of hydraulic cutting knives in the Mingyuefeng area of Hunan Province

摘要:

湖南省明月峰地区钻探施工中灰岩、泥岩地层易发生缩径卡钻事故，往往采用套管进行护壁。由于套管下入较深，且便携式钻机起拔能力有限，套管回收困难，采取的方法是使用水力割刀将套管中间割断进行回收。在实际切割过程中，切割套管的成功率不高，主要表现为切割结束后套管仍然无法提出钻孔，切割后的水力割刀易出现刀片崩坏、过度磨损等情况，主要原因为卡点位置判断错误和切割操作不规范。针对切割失败的原因制定了水力割刀的使用注意事项。按照相关注意事项对套管进行切割，可大幅度提高切割的成功率。

关键词:水力割刀;套管切割;缩径卡钻;事故处理;便携式钻机

Abstract:

During the drilling construction in the Mingyuefeng area of Hunan Province， accidents such as hole shrinkage and tool stuck are prone to occur in limestone and mudstone formations， and casing is often used for wall protection. Due to the deep penetration of the casing and the limited lifting capacity of the portable drill， it is difficult to recover the casing. The method adopted is to use a hydraulic cutter to cut the middle of the casing for recovery. In the actual cutting process， the success rate of casing cutting is not high， mainly manifested as the casing still cannot be lifted out of the drilling hole after cutting， and the hydraulic cutting blade after cutting is prone to breakage， excessive wear， etc. The main reasons are incorrect judgment of the stuck point position and irregular cutting operation. In this paper， precautions for the use of hydraulic cutting tools are formulated to address the reasons of cutting failure. Cutting the casing according to relevant precautions can significantly improve the success rate of cutting.

Key words:hydraulic cutting blade;casing cutting;hole shrinkage and tool stuck;accident handling;portable drill