Medical Device Directory

SUPERFORCE Drilling Jars

Available from G-FORCE JARS, LLC

The hydraulic jar utilizes an oil reservoir with some type of metering orifice and a bypass area. When the string becomes stuck, overpull is applied. As the force is applied the sliding mandrel will begin to compress the oil in the reservoir, forcing the oil to bleed off slowly through the metering orifice. This allows time for the drill string to establish the strain energy required for the jarring effect. When the piston on the mandrel comes to the bypass area, the oil bleeds off almost instantly. The hammer then speeds toward the anvil, impacting and transferring the drill strings stored energy to the stuck point.


The SUPERFORCE JAR is a double acting hydraulic drilling jar. The SUPERFORCE JAR is delivered to location in the OPEN position (approximately 29 inches of mandrel exposed) and usually will be open when it is pulled out of the hole. This jar can be run in tension or compression. When in tension the jar should be run above the weight transition zone. NOTE: Always allow 20% available bit weight below the jar.

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