Drill string shock absorbing apparatus

Details Drill string shock absorbing apparatus Drill string shock absorbing apparatus

E - Fixed Constructions

21

B

255/28

E21B 17/02 (2006.01) E21B 17/06 (2006.01) E21B 17/07 (2006.01) F16F 9/18 (2006.01)

Patent

CA 1051863

Abstract of the Disclosure 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 man- drel with large diameter bearing surfaces is carried reci- procally 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. -2-

260826

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