YJZ Type Hydraulic-mechanical Drilling Jar with 120-450 KN Downward Jarring Force, 250-1000 KN Upward Jarring Force, and 800-2800 KN Max Tensile Load
The YJZ type hydraulic-mechanical drilling jar integrates hydraulic and mechanical principles and is designed for various drilling operations when combined with drilling tools. When downhole tools become stuck, this equipment generates upward or downward jarring forces through lifting and landing drilling strings. Multiple jarring actions can release blocks and stuck tools, enabling prompt resumption of normal drilling operations.
This technology helps prevent resistance and sticking that could lead to further accidents and significant economic losses. If initial releasing force proves insufficient, the system allows for dynamic adjustment on-site at any time.
| Model | YJZ108 | YJZ121 | YJZ165 | YJZ203 |
|---|---|---|---|---|
| OD mm(inch) | 108(4-1/4) | 121(4-3/4) | 165(6-1/2) | 203(8) |
| ID mm(inch) | 38.1(1-1/2) | 44.5(1-3/4) | 57.2(2-1/4) | 70(2-3/4) |
| Tool Joint Connection API | NC31 | NC38 | NC50 | 6-5/8 REG |
| Max. Upward Jarring Force KN(Ibf) | 250(56,000) | 350(79,000) | 700(160,000) | 1000(225,000) |
| Max. Downward Jarring Force KN(Ibf) | 120(27,000) | 170(38,000) | 350(79,000) | 450(100,000) |
| Max. Tensile Load KN(Ibf) | 800(180,000) | 1100(247,000) | 2000(450,000) | 2800(630,000) |
| Tensile Yield KN(Ibf) | 1350(300,000) | 1950(438,000) | 3750(843,000) | 6650(1,495,000) |
| Torsional Limited KN*m(Lbf ft) | 10(7,400) | 15(11,000) | 30(22,000) | 45(33,000) |
| Torsional Yield KN*m(lbf ft) | 18(13,200) | 27(20,000) | 75(55,000) | 90(66,000) |
| Overall Length mm(ft) | 6696(22) | 6696(22) | 6455(21.2) | 7215(23.7) |
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