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Hydraulic drilling jars are expertly engineered, featuring dual pistons separated by a sophisticated valve system. As tension or compression acts on the armed hydraulic jar, fluid within one piston is energetically compressed, transferring to the other piston with high flow resistance. This regulated flow rate determines the arming duration-greater pulling or pushing forces equate to swifter arming times. The dynamic movement within, termed the stroke, reaches its pivotal point when the compressed fluid releases through an ingeniously designed bypass valve. This action propels the fluid towards the second piston, harmonizing pressure instantaneously. The more forceful the application, the greater the fluid compression, resulting in expedited arming and intensified jarring force.
In scenarios where the drill string is immobilized at the bottom during drilling, or twist offs occur, the jar demonstrates its prowess by delivering a potent upward release. Conversely, if the pipe is off-bottom stuck, for instance, in key seats or other causes, downward jarring becomes the solution. Subsequently, upward reaming techniques are employed to successfully retrieve the entire drill string, ensuring minimal disruption.
Encountering differential sticking necessitates strategic movement of the immobilized pipe to restore rotation and circulation, allowing the jars to operate in their usual up-and-down rhythm. Impressively, jar actuation maintains the directional orientation of the drillstring, proving these tools invaluable for downhole motor directional drilling and directional jetting, as they serve as neutral, non-intrusive aids.
Beyond drilling, jars find versatile applications in fishing and cutting tasks, cementing, coring operations, and a multitude of downhole procedures. Their indispensable functionality extends across the spectrum of drilling and production tools.
Introducing the Full Hydraulic Drilling Jar Type QY, designed with an innovative needle valve type structure, delivering both upward and downward hydraulic impact with seamless tonnage adjustments. This tool not only safeguards the drill string but also enhances its longevity. Equipped with a patented hydraulic energy storage mechanism, it offers remarkable stability. Experience a versatile delay time range from 30 to 240 seconds, and a broad operational temperature spectrum from -40ºC to 180ºC. The incorporation of advanced special materials enhances its performance and ensures higher safety standards. Widely acclaimed for its utility in drilling, coring, workover, 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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