Drill string shock absorbing apparatus

Details Drill string shock absorbing apparatus Drill string shock absorbing apparatus

1976-02-17

1977-10-25

Cherry, Johnny D.

Spring devices

Fluid

Expansible-contractible chamber device

64 23, 175321, 308 4A, E21B 1702, F16F 918

Patent

active

040553388

ABSTRACT:
Apparatus is disclosed for use in a drill string during rotary well drilling, especially of shallow holes such as blast holes, to absorb the shock loads imposed upon the drill bit and drill. A floating solid piston in an outer tubular body separates a gas chamber from a liquid chamber and equalizes the pressure between the two. A mandrel with large diameter bearing surfaces is carried reciprocally within the body, and has annular lubricating cavities separated from the liquid chamber. Lubricating passages include one in which a pressurized gas in a cavity supplies lubricant under pressure to the various bearing and sealing surfaces. Cylindrical pins inserted between the mandrel and the outer tubular body transmit torque between the body and mandrel.

REFERENCES:
patent: 3073134 (1963-01-01), Mann
patent: 3122902 (1964-03-01), Blair et al.
patent: 3225566 (1965-12-01), Leathers
patent: 3244459 (1966-04-01), Ortloff
patent: 3382936 (1968-05-01), Galle
patent: 3383126 (1968-05-01), Salvatori et al.
patent: 3746329 (1973-07-01), Galle

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