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倒扣接头也叫倒扣予，是指在钻井、修井过程中倒出卡点以上被卡钻柱的专用工具。在处理卡钻事故的倒扣作业中可以代替公锥。打捞或倒扣时，若落鱼被卡或倒不开，可从倒扣接头处退开，起出打捞钻具。
is also called reversing spear which is a special tool for revering stuck drill stem above stuck point in drilling and work over operation.In treatment of stuck drill stem ,it can work as a fishing pin tap in reversing operation.
When fish is stuck or can not be reversed in fishing or reversing operation,the fish can be reversed from reversing sub and the fishing drill tool can be tripped out.
技术规格及参数
| 类型 |
工具外径(mm) |
接头螺纹(LH) |
打捞螺纹(RH) |
| DKJ105 |
105 |
NC31 |
NC31 |
| DKJ121 |
121 |
NC38 |
NC38 |
| DKJ165 |
165 |
NC50 |
NC46 |
| DKJ165 |
165 |
NC50 |
NC50 |
| DKJ165 |
165 |
NC50 |
5 1/2 FH |
| DKJ165 |
165 |
NC50 |
NC56 |
| DKJ178 |
178 |
NC50 |
6 5/8 REG |
| DKJ203 |
203 |
NC50 |
NC61 |
| DKJ203 |
203 |
NC50 |
7 5/8 REG |
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