Shock absorbing tool for a well drilling string

Details Shock absorbing tool for a well drilling string Shock absorbing tool for a well drilling string

E - Fixed Constructions

21

B

255/28

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

Patent

CA 1226274

ABSTRACT OF THE DISCLOSURE A shock absorbing tool for a well drilling string having a mandrel which connects to the well string, a telescoping barrel which connects to a rotary drilling bit and a fluid-filled annular chamber between the mandrel and the barrel enclosed at one end by a free-floating annular piston to maintain the chamber fluid pres- sure at ambient pressure, the chamber also containing a resilient shock absorbing element which is always placed under compression to dampen longitudinal movement of the mandrel and the barrel with respect to one another regardless of the direction of the longitu- dinal movement.

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