Mechanical drill string jar

Details Mechanical drill string jar Mechanical drill string jar

1985-11-12

1987-08-25

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Resiliently biased

175304, 175305, E21B 406, E21B 410

Patent

active

046886494

ABSTRACT:
A mechanical jar used primarily on drill strings, in earth boreholes, to aid in freeing drill strings stuck in a well bore. A telescoping drill string component is constrained in a selected telescoped condition by a biased lock until enough axial stress is applied to the telescoped jar to release the lock. Energy stored in the stressed length of drill string then moves rapidly to strike a solid limit to the telescoping travel. The inertia of the moving part of the drill string applies a shock to the stationary, downwardly continuing part of the drill string. The shock is to aid in releasing the stuck string situation. The tension required to release the lock is adjustable, as a design alternative, by applying torque to the drill string. The jar can, by design alternative, be used to strike in either or both axial directions.

REFERENCES:
patent: 2008743 (1935-07-01), Black
patent: 2065135 (1936-12-01), Huddleston et al.
patent: 2144869 (1939-01-01), Boulter
patent: 2819877 (1958-01-01), Koppl
patent: 2978048 (1961-04-01), Walker
patent: 4376468 (1983-03-01), Clark

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