Shock attenuating apparatus and method

Details Shock attenuating apparatus and method Shock attenuating apparatus and method

E - Fixed Constructions

21

B

E21B 29/02 (2006.01) E21B 17/07 (2006.01) E21B 43/119 (2006.01)

Patent

CA 2066098

Abstract of the Disclosure An apparatus attenuates a shock, such as from an explosion, by undergoing plastic deformation and by serially dissipating energy from a plurality of surfaces. In a particular embodiment, the plastic deformation and serial energy dissipation occur in and from a hollow unitary body having a cylindrical wall in which are defined a plurality of longitudinally spaced circumferential grooves. A method of attenuating a shock wave from an explosion in an oil or gas well comprises: lowering into the well an explosive connected to a shock attenuating member; detonating the explosive whereby a shock wave is generated; and collapsing without severing the member in response to the shock wave and dissipating energy of the shock wave from a plurality of surfaces of the member so that the shock wave is attenuated along the member.

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