The advantage of the ULTIMATE Double-Acting Hydraulic drilling jar (UHJDA) is its ability to dramatically increase the allowable overpull force during detent. Our patented “Max Pull During Delay” feature is designed to take advantage of higher tensile forces available on modern rigs and with premium strength drill pipe that is currently used in industry. The proprietary ULTIMATE design can handle significantly higher overpull forces during delay than any other jar in the market.

The UHJDA is a bidirectional drilling jar that incorporates hydraulic delay without a latch mechanism. This allows the operator to apply variable impact in both the up and down directions in highly deviated or high-friction wells where conditions may prevent applying sufficient force to release a mechanical latch.

Operation

When jarring up:

• With the jar in neutral position, apply the desired overpull in excess of the free string weight, which will start the hydraulic delay sequence. At the end of the hydraulic delay, the jar will release, causing an upward impact force.
• If necessary, lower the drill string sufficiently to close the jar to the neutral position and it will be ready to jar up again.

When jarring down:

• With the jar in the neutral position, lower the drill string to apply the desired down force, which will start the hydraulic delay sequence. At the end of the hydraulic delay, the jar will release, causing a downward impact force.
• If necessary, raise the drill string sufficiently to open the jar to the neutral position and it will be ready to jar down again.