Technique for damping oscillations in a drill string

Details Technique for damping oscillations in a drill string Technique for damping oscillations in a drill string

E - Fixed Constructions

21

B

255/28

E21B 17/07 (2006.01)

Patent

CA 1150235

TECHNIQUE FOR DAMPING OSCILLATIONS IN A DRILL STRING Abstract of the Disclosure There is disclosed a shock sub for incorporation in the lower part of a drill string for damping oscillations of the bit and drill string during drilling. The shock sub incorporates a spring assembly including a multiplicity of substantantially annular ring springs that exhibit a spring rate of less than about 25,000 pounds per inch of deflection.

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