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针对油水井大修施工取换套管作业中使用ＮＤ—Ｊ１１４型机械式内割刀切割套管时操作工艺复杂、成功率低等缺点，研制开发了ＮＤ—Ｓ１１４型套管内割刀。这是一种利用水力学原理，从井下套管柱内部切割套管的专用工具，可在任意井深位置切割及打捞井下落鱼套管和套管附件，操作过程十分简单方便。切割刀具镶焊硬质合金，大大改善了刀具的切削性能，提高了切削速度和使用寿命，解决了以往高钢级套管（如Ｐ１１０套管）不易切削的难题。两年多以来３８井次的切割作业成功率都达到１００％，取出套管７万余ｍ。
In view of the shortcomings of complicated operation and low success rate when using ND-J114-type internal cutting knife to cut the casing in the oil-water well overhaul construction replacement casing operation, the ND-S114 internal casing cutting knife has been developed. This is a special tool that uses the principle of hydraulics to cut the casing from the inside of a casing string downhole. It can cut and retrieve the downhole casing and casing downhole at any well depth. The operation is very simple and convenient. Cutting tool with carbide welding, which greatly improved the cutting tool performance, improve the cutting speed and service life, to solve the previous high-grade steel casing (such as P110 casing) difficult to cut the problem. Over the past two years, the success rate of 38 well operations has reached 100%, and the casing pipe was taken out more than 70,000 m.