API Mechanical and Hydraulic-Mechanical Drilling Jar

BEIJING - March 1, 2022 - PRLog -- API Mechanical and Hydraulic-Mechanical Drilling Jar for Downhole Releasing Stuck

Jars provide a means of supplying powerful upward or downward blows to the stuck drillstring.A jar is a mandrel which slides within a sleeve. The free end of the mandrel is shaped in the form of a hammer to provide a striking action against the face of the anvil.Depending on the type of tripping mechanism, there are two basic types of jar: mechanical and hydraulic. Mechanical jars have a preset load that causes the jar to trip; hammer striking the anvil. They are thus sensitive to load being used and not to time.Mechanical jars are pre-set at surface.

Hydraulic jars use a hydraulic fluid to control the firing of the jar until the driller can apply the appropriate load to the string to give a high impact. This controlled action (delay) is provided by hydraulic fluid which is forced through a small port or series of jets. Hydraulic jar firing delay is dependent upon the combination of load and time. Hence hydraulic jars are adjustable according to downhole overpull.

Oil jars: provide means for applying upward blows to release a stuck pipe.

Accelerators: store energy above the drillcollars in order to increase the impact efficiency of oil jar.

Bumper jars: provide free travel to assist in engaging the fish and to allow downward blows to be transmitted to the fish.and for releasing overshots downhole and at surface.

In general, an increase in jar stroke length increases the jarring effect. With these obvious advantages, a long stroke hydraulic jar is preferable to a mechanical jar.

Up jarring
Lowering drill string to make drilling jar closed completely (in locking position),elevating drill string by the order of small tonnage to larger tonnage, which make spring and hydraulic cylinder delay, when mandrel move to a position and become release resistance, the spring force stored in drill string will transfer to upforward energy and up jarring. Repeating the above several times can force tool to produce continues up jarring.

Down jarring
Move up and down the drill string to make drilling jar closed completely (in locking position), lowering drill string to make spring compressed and stored energy. When pressure of jar is larger than the desired lower unlocking force, grapple will slide out from mandrel to release the locking and make down jarring. Repeating the above several times can force tool to produce continues down jarring.

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