Jarring method and apparatus for well bore drilling

Details Jarring method and apparatus for well bore drilling Jarring method and apparatus for well bore drilling

1976-12-27

1978-07-04

Novosad, Stephen J.

Wells

Processes

Freeing stuck object, grappling or fishing in well

175297, 166178, E21B 110

Patent

active

040983382

ABSTRACT:
Well bore pressure is utilized to develop an activating pressure during telescoping movement between an outer drill string and an inner mandrel for momentarily locking the mandrel to the drill string. Locking is effected through laterally displaceable mechanical elements carried by the mandrel and held engaged for a predetermined period of time during which an axial tension is applied to the mandrel. A control circuit independent of the amount of axial tension load provides for sudden release of the locking elements at the end of said predetermined period which results in free travel of the mandrel to an impact position to deliver a jarring blow to the drill string for dislodging stuck elements or junk in the well bore.

REFERENCES:
patent: 2172480 (1939-09-01), Osmun
patent: 2678805 (1954-05-01), Sutliff
patent: 2690226 (1954-09-01), Comstock
patent: 3285353 (1966-11-01), Young
patent: 3349858 (1967-10-01), Chenoweth
patent: 3399741 (1968-09-01), Monroe
patent: 3851717 (1974-12-01), Berryman

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