The HydraQuaker hydraulic drilling jar is capable of higher overpull and impact than conventional impact tools of the same size. The HydraQuaker jar’s impact action requires no torque buildup to fire, allowing its long free stroke to maximize impact, producing a consistent and reliable jarring force over a broad range of borehole conditions. To fire the jar, the driller simply raises or lowers the drillstring, and the proprietary metering mechanism sets the HydraQuaker jar to deliver an impact. And, there’s never any need to circulate or cool down the jar, because its proprietary design enables the jar to endure high pressures and operating temperatures of up to 300 degF and 450 degF when equipped with its optional high-temperature seals.