An apparatus and method for dissipating explosive shock/stress waves

An apparatus 10 and method for dampening stress waves propagated from the detonation of an explosive device 18 in a wellbore 16 to protect a device 22 positioned downhole. The method includes the steps of: positioning a shock dissipater 20 between an explosive device 18 and a package 22; detonating...

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Bibliographische Detailangaben
Hauptverfasser:	STEPHEN W HENDERSON, LARRY GRIGAR
Format:	Patent
Sprache:	eng
Schlagworte:	AMMUNITION BLASTING DETECTING MASSES OR OBJECTS EARTH DRILLING EARTH DRILLING, e.g. DEEP DRILLING EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION FIXED CONSTRUCTIONS GEOPHYSICS GRAVITATIONAL MEASUREMENTS HEATING LIGHTING MEASURING MECHANICAL ENGINEERING MINING OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR ASLURRY OF MINERALS FROM WELLS PHYSICS TESTING WEAPONS
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Beschreibung
Zusammenfassung:	An apparatus 10 and method for dampening stress waves propagated from the detonation of an explosive device 18 in a wellbore 16 to protect a device 22 positioned downhole. The method includes the steps of: positioning a shock dissipater 20 between an explosive device 18 and a package 22; detonating the explosive device 18 propagating a stress wave 36 toward the shock dissipater 20 and the package 22, the shock dissipater 20 reflecting a portion of the stress wave 36. The shock dissipater 20 may have two interfaces 32, 32ab, 32bc arranged between materials 30a, 30b, 30c of dissimilar acoustic impedances selected to reflect a compressive portion 36r of the stress wave at one interface 32ab and a tensile portion 36t of the stress wave at another interface 32bc.