Fluid Powered drilling jar

Details Fluid Powered drilling jar Fluid Powered drilling jar

1986-10-06

1989-02-28

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Fluid-operated

166178, E21B 100, E21B 31113

Patent

active

048077097

ABSTRACT:
A hydraulic drill string jar is powered and actuated by drilling fluid pressure controlled from the earth surface. By selective manipulation of drilling fluid flow, the jar can be conditioned to operate in drilling mode to avoid activation of the jars while normal drilling and fluid flow activities take place. By different fluid flow manipulations, the jar is conditioned to operate in the jarring mode. In the jarring mode, the jars will axially shock the drill string each time the flow rate is reduced below a preselected amount and then increased to a higher preselected amount.

REFERENCES:
patent: 3361220 (1968-01-01), Brown
patent: 3379261 (1968-04-01), Martini
patent: 3491838 (1970-01-01), Wilder et al.
patent: 3570611 (1971-03-01), Riziuc et al.
patent: 3735827 (1973-05-01), Berryman
patent: 4200158 (1980-04-01), Perkins
patent: 4478284 (1984-10-01), Tomm et al.
patent: 4655289 (1987-04-01), Schoeffler

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