Drilling jar
 Model No: | API certificate |
 Name: | Drilling jar |
 Application: | land and offshore wells |
- Description
- Specifications
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Jar is one of the effective tools to relieve sticking accidents. In drilling operation, due to complex geological structure (such as wellbore collapse, plastic flow and compression of naked formation) and improper technical measures (such as pump shutdown time is too long, bit mud bag, etc.), drilling tool resistance sticking often occurs.
Vibrator is one of the effective tools to relieve sticking accident.
At present, the vibrators used in China are mainly from Weatherford, Baker, Bowen, NationalOilwell, Rocan, Cougar, Guizhou Gaofeng Machinery Factory, Beijing Petroleum Machinery Factory and other manufacturers.
The main types of jar are while drilling jar, salvage jar and ground jar.
The jar while drilling should be designed in the drill string assembly. if it is stuck in the process of drilling or up and down drilling, the jam can be released at any time.
Jar products are of great significance for drilling operations.
the correct selection and use of jar products can give full play to their due efficiency and bring greater economic benefits to the drilling industry.
| Model | QYZ121 | QYZ165 | QYZ203 | QYZ241 | |
| OD | mm (inch) | 121(4-3/4) | 165(6-1/2) | 203(8) | 241(9-1/2) |
| ID | mm (inch) | 44.5(1-3/4) | 57.2(2-1/4) | 70(2-3/4) | 76.2(3) |
| Tool joint conncetion | API | NC38 | NC50 | 6-5/8REG | 7-5/8REG |
| Max. upward jarring force | KN(lbf) | 350(79000) | 700(160000) | 1000(225000) | 1250(280000) |
| Max. downward jarring force | KN(lbf) | 180(40000) | 350(79000) | 500(112000) | 650(140000) |
| Max. tensile load | KN(lbf) | 1100(247000) | 2000(450000) | 2800(630000) | 3500(780000) |
| Tensile yield | KN(lbf) | 1950(438000) | 3750(843000) | 6650(1495000) | 9850(2210000) |
| Torsional limited | KN·m(lbf·ft) | 15(11000) | 30(22000) | 45(33000) | 75(56000) |
| Torsional yield | KN·m(lbf·ft) | 27(20000) | 75(55000) | 90(66000) | 150(112000) |
| overall length | mm(ft) | 6063(19.9) | 6375(20.9) | 6692(22) | 6920(22.7) |
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