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机械式内割刀是一种从井下管柱内部切割管子的专用工具，除接箍外可在任意部位切割。在切割作业时可将可退式打捞矛接在内割刀上部，待切割完成后，将上部管柱一次提出。
The mechanical internal cutter is a special tool to cut pipe in pipe string. With exception of coupling, it can cut at any position of fish. During cutting operation, the releasing spear can be connected above internal cutter, after finish cutting, pipe string above cutting position can be lifted out at a time.技术规格及参数
| 型号 |
工具外径(mm) |
接头螺纹 |
切割管柱内径(mm) |
切割管柱外径 |
| ND-J114 |
91 |
NC26 |
97-104 |
4 1/2 |
| ND-J127 |
102 |
NC26 |
107-115 |
5 |
| ND-J140 |
112 |
NC31 |
118-128 |
5 1/2 |
| ND-J168 |
138 |
NC38 |
144-153 |
6 5/8 |
| ND-J178 |
145 |
NC38 |
150-166 |
7 |
| ND-J245 |
210 |
NC50 |
216-228 |
9 5/8 | |
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