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JYSZ Double Acting Hydraulic-Mechanical Drilling Jar
Introduction:
(The drilling jar is a double acting jar) This drilling jar is designed to deliver hydraulic delay when jarring in the up direction, and mechanical release when jarring in the down direction. It provides excellent functional stability and strong jarring forces in both jarring direction. It is used to free stuck drill string components and is recommended for directional/deep wells drilling application.
Working principle
●Up Jarring
Lower the drill stem to ensure that drilling jar is closed completely (in locking position). Up jarring is achieved by slowly increasing the lifting force on the drill stem, until there is sufficient pull force to overcome the spring resistance and initial hydraulic time delay. During the time delay, the overpull at surface can be adjusted to vary the desired impact force. When the mandrel reaches the trigger position, there is a sudden release in resistance, the elastic potential energy stored within the drill string will be transmitted to forward up jarring impact energy. After impact, apply a downward force sufficient to close jar in locking position, then repeat the jarring cycle as required.
●Down Jarring
Lift and lower the drill stem to ensure that the drilling jar is closed completely (in locking position). Down Jarring is achieved by applying sufficient downward force to compress the spring and store elastic potential energy. When the pressure of the jar is greater than the desired unlocking force, the grapple will slide away from the mandrel to release the locking, performing down jarring action. Repeat the procedures to produce continuous down jarring action.
Available model:
JYSZ121 JYSZ159 JYSZ165 JYSZ178 JYSZ203 JYSZ241
Specifications - JYSZ Double Acting Hydraulic-Mechanical Drilling Jar
1 JYSZ Double Acting Drilling Jar JYSZ121 121 51 NC38 4670 295 152 152 350 180 80 1600 1100 20 15 55 3555 8120
2 JYSZ Double Acting Drilling Jar JYSZ159 159 57.2 NC46 5300 620 152 152 700 400 180 3400 2000 51 25 100 4265 9450
3 JYSZ Double Acting Drilling Jar JYSZ165 165 57.2 NC50 5300 665 152 152 700 400 180 3400 2000 51 25 100 4265 9450
4 JYSZ Double Acting Drilling Jar JYSZ178 178 64 NC50 5880 740 152 152 800 400 180 3700 2400 60 30 110 3710 9460
5 JYSZ Double Acting Drilling Jar JYSZ203 203 71.4 6 5/8 REG 5830 1120 152 152 1000 420 190 4400 2800 100 35 176 3510 9210
6 JYSZ Double Acting Drilling Jar JYSZ241 241 76.2 7 5/8 REG 6250 1770 152 152 1250 440 200 5400 3500 129 40 238 3410 9530
