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Hydraulic drilling jars are expertly crafted with two pistons separated by a valve, creating a dynamic system that responds to applied tension or compression. As force is exerted on the armed hydraulic jar, fluid in one piston is compressed, flowing to the other piston against robust flow resistance. This sophisticated mechanism controls the arming time, with increased pulling or pushing forces resulting in a quicker armament. The precision-engineered stroke measures the distance of movement, and upon reaching a critical position, compressed fluid rapidly releases through a bypass valve. This refined action propels fluid toward the second piston, instantly balancing the pressure and generating a formidable jarring force-the greater the force applied, the more compressed the fluid, and the stronger the impact.
In the event of the drill string becoming stuck on the bottom while drilling, or encountering twist-offs, the jar delivers a powerful upward release motion. Should the pipe find itself stuck off-bottom within key seats or due to other factors, a downward jarring motion achieves the necessary release. This innovative approach allows for effective use of upward reaming methods to recover the entire drill string seamlessly.
When dealing with differential sticking, regaining rotation and circulation by mobilizing the stuck pipe becomes imperative. In such situations, jars adeptly move up and down uninhibited, without disturbing the drillstring's directional orientation. This makes them invaluable as neutral tools in downhole motor directional drilling and directional jetting, ensuring precision and efficiency.
Jars provide unmatched versatility across multiple operations, excelling in fishing and cutting jobs, drilling, and production tools, as well as cementing and coring operations. This makes them indispensable for a wide range of demanding downhole tasks.
The Full Hydraulic Drilling Jar Type QY boasts a cutting-edge needle valve type structure, offering hydraulic impact in both upward and downward motions with seamless tonnage adjustments. This advanced design not only enhances drill string protection but also extends service life. Featuring a patented hydraulic energy storage mechanism, it promises remarkable stability. With a delay time range of 30s to 240s and a working temperature range of -40ºC to 180ºC, it adopts new special materials to deliver superior performance and safety. Its applications span drilling, coring, workovers, fishing, and beyond.
| Model | Tool OD mm (in) |
ID of Bore mm (in) |
Connection API |
Allowable Working Tensile kN(Ib) |
Allowable Working Torque kN· m(lb· ft) |
Max. Up Jarring kN(Ib) |
Max. Down Jarring kN(Ib) |
Up Stroke mm |
Down Stroke mm |
Open Length mm |
| QY108 | 108 (4 1/4) |
38 (1 1/2) |
NC31 | 800 (180000) |
10 (7000) |
250 (55000) |
120 (26000) |
152 | 152 | 5835 |
| QY121 | 121 (4 3/4) |
50 (2) |
NC38 | 1100 (250000) |
15 (11000) |
350 (78000) |
180 (40000) |
152 | 152 | 5768 |
| QY127 | 127 (5) |
50 (2) |
NC38 | 1100 (250000) |
15 (11000) |
350 (78000) |
180 (40000) |
152 | 152 | 5768 |
| QY140 | 140 (5 1/2) |
50 (2) |
NC38 | 1100 (250000) |
15 (11000) |
350 (78000) |
180 (40000) |
152 | 152 | 5768 |
| QY159 | 159 (6 1/4) |
57 (2 1/4) |
NC46 | 2000 (450000) |
30 (22000) |
700 (160000) |
350 (78000) |
152 | 152 | 5939 |
| QY165 | 165 (6 1/2) |
57 (2 1/4) |
NC50 | 2000 (450000) |
30 (22000) |
700 (160000) |
350 (78000) |
152 | 152 | 5939 |
| QY172 | 172 (6 3/4) |
57 (2 1/4) |
NC50 | 2000 (450000) |
30 (22000) |
700 (160000) |
350 (78000) |
152 | 152 | 5939 |
| QY178 | 178 (7) |
70 (2 3/4) |
NC50 | 2400 (540000) |
35 (25800) |
800 (180000) |
400 (90000) |
152 | 152 | 6000 |
| QY203 | 203 (8) |
76.2 (3) |
6 5/8REG | 2800 (630000) |
45 (33000) |
1000 (225000) |
500 (110000) |
152 | 152 | 6000 |
| QY216 | 216 (8 1/2) |
76.2 (3) |
6 5/8REG | 2800 (630000) |
45 (33000) |
1000 (225000) |
500 (110000) |
152 | 152 | 6000 |
| QY229 | 229 (9) |
76.2 (3) |
7 5/8REG | 3000 (630000) |
65 (26000) |
1200 (270000) |
600 (132000) |
152 | 152 | 6106 |
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