Hydraulic Mechanical Drilling Jar

The Challenger Hydraulic Mechanical Drilling Jar is an all-purpose Drilling jar suited for all drilling applications. This jar is equipped with a mechanical ‘safety” latch and hydraulic delay when jarring upwards, a Mechanical latch for jarring downwards.

The Challenger mechanical “safety” latch keeps the jar locked in the neutral position and eliminates unexpected jarring while tripping or racking the jar in the derrick. Latch release settings can be adjusted to expand the range of the jar placement in the drill string.

Hydraulic Delay while jarring upwards offers the operator the opportunity fire the jars harder or softer. Once the jar starts the delay sequence while jarring up wards the operator can increase the pull to hit harder if desired. It should be noted that the maximum pull during delay should not be exceeded, this limit is provided on our spec sheet.

When jarring up apply overpull to overcome the latch setting, which initiates the hydraulic delay. During this hydraulic delay sequence the jar can be pulled harder if required which increases the impact force. See the Jar specifications to determine maximum pull during delay.

Pick up string weight above the jar + any hole drag above jar + Jar’s latch setting, the jar will now come out of latch.

Example; String weight above jars 120,000 lbs. + hole drag above jars 20,000 lbs. + Jar’s latch setting 85,000 lbs. = 225,000 lbs. required to pull jar out of latch and begin hydraulic delay.

After impact, apply a down force to close jar re-engage latch, then repeat jarring cycle if needed.

When jarring down apply weight to Jars to overcome Down latch setting and pump open force, at this point the latch will release in the jar allowing it to fire downwards.

Example; Slack off drill string overcoming latch setting, Down Lock setting 45,000 lbs. + pump open force (if pumps are on) 20,000 lbs. = 65,000 lbs. Jars will fire down.

After impact, pick up drill string to re-latch jars and repeat if needed.