Downhole pressure attenuation apparatus

摘要: A downhole pressure attenuation apparatus is provided by which the explosive and hydraulic peak quasi-static pulses generated perforating gun detonation are attenuated one or more fluid-free chambers having initially closed vent ports opened substantially contemporaneous with so as to provide free volume, absorbing cavities. The made up of at least chamber relief vents. Each includes charge port assembly a prestressed an filled shaped charge. number assemblies used in each determined surface area be size chamber. operatively connected common filled, detonating cord forms part cord, extension thereof depending on location attenuating respect guns. As fires, it causes sequentially fire blow out open holes leading amount charges limited that does not damage surrounding tubular bodies well.