Double acting shock absorbers for drill strings

Details Double acting shock absorbers for drill strings Double acting shock absorbers for drill strings

E - Fixed Constructions

21

B

255/28

E21B 17/10 (2006.01) E21B 17/07 (2006.01)

Patent

CA 1101831

DOUBLE ACTING SHOCK ABSORBERS FOR DRILL STRINGS ABSTRACT A telescopic shock absorber for incorporation in a drill string connected to a rotary bit for drilling a bore drill in earth formations, the shock absorber including a single spring assembly which is compressed downwardly when sufficient downwardly directed drilling weight is transmitted from the drill string through the shock absorber to the drill bit, and which is compres- sed upwardly when the internal drilling fluid pressure in the shock absorber fully overcomes the downwardly directed drilling weight, assuring that the spring assembly is in its compressed condition when the shock absorber is telescoped or extended, enab- ling it to absorb shocks and vibrations incident to the drilling operation and under both conditions.

320318

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