Explosive shock dissipater
AssigneeSchlumberger Technology Corporation
InventorsSteven W. Henderson, Larry Grigar
Life of this patent
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Abstract
A method of dampening stress waves propagated from the detonation of an explosive device in a wellbore to protect a device positioned downhole including the steps of positioning a shock dissipater between an explosive device and a package; detonating the explosive device propagating a stress wave toward the shock dissipater and the package; and reflecting a portion of the stress wave in the shock dissipater. The shock dissipater may have one or more interface formed between materials of dissimilar acoustic impedances. The shock dissipater may reflect a compressive portion of the stress wave at one interface and a tensile portion of the stress wave at another interface.
Claims21
An apparatus for dampening a stress wave, the apparatus comprising a first interface formed between a first layer of material and a second layer of material, the first and second layers of material having dissimilar acoustic impedances.
A wellbore tool string, the tool string comprising:
- an explosive device,
- a package;
- and
- a shock dissipater positioned between the explosive device and the package, the shock dissipater including a first interface formed between a first layer of material and a second layer of material, the first and second layers of material having dissimilar acoustic impedances.
A method of dampening stress waves propagated from the detonation of an explosive device in a wellbore to protect a device positioned downhole, the method comprising the steps of:
- positioning a shock dissipater between an explosive device and a package;
- detonating the explosive device propagating a stress wave toward the shock dissipater and the package;
- and
- reflecting a portion of the stress wave in the shock dissipater.
Dependencies are inferred from the claim text.