Downhole tools
 | Name：BIG JOHN? Hydraulic Jar |
|---|---|
Spec： | |
Introduce： |
The BIG JOHN® hydraulic jar is included as part of a toolstring to help remove stuck tools. The jar helps free a stuck tool or toolstring by resisting a pull on the workstring. When the workstring is stretched by the pull, tension in the jar is released and an upward impact is delivered to the stuck tool. |
Downhole tools
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- 破裂盤（RD）油管柱測試閥
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- BIG JOHN? Hydraulic Jar
- Drain Valve
- Shock absorbe
- 減震器
- Super safety valve