F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
255/28
F16D 3/06 (2006.01) E21B 17/04 (2006.01) E21B 17/07 (2006.01) F16F 9/18 (2006.01)
Patent
CA 1065300
DRILL STRING SHOCK ABSORBER ABSTRACT OF THE DISCLOSURE A drill string shock absorber having a depending tubular mandrel, for connection with a drill bit, slidably mounted in and drivingly connected to a tubular housing which is composed of upper, intermediate and lower tubular sections, preferably; the uppermost has a bore complementary to and slidably engaged by upper packing means on upper end of mandrel, intermediate section has a bore complementary to and in slidable engagement with mandrel, and the lowermost has an upper bore complementary to and slidably engaged by downwardly biased lower packing means slidably confined upon mandrel and a lower bore complementary to mandrel with slidable drive connection between mandrel and housing therein. Upper and lower packing means coact to provide upper annular sealed chamber therebetween composed of bores of housing sections and containing noncom- pressible fluid to cushion drill bit impacts; sealing means, at bottom of bore of lowermost housing section and in slidable engagement with mandrel, coacts with lower packing means to form lower annular chamber enclosing slidable drive connection and containing lubricant therefor; flow control means in lower portion of upper chamber to resist relative upward reciprocation of mandrel.
284609
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