An assembly for downhole drilling and milling, namely, an axial vibration generator and a vibration dampener that introduce axial vibrations to the drill string in order to reduce frictional drag and help transmit weight to the bit to improve rate-of-penetration

'assembl':2 'axial':10,19 'bit':37 'dampen':16 'downhol':4 'drag':30 'drill':5,23 'friction':29 'generat':12 'help':32 'improv':39 'introduc':18 'mill':7 'name':8 'order':26 'penetr':43 'rate':41 'rate-of-penetr':40 'reduc':28 'string':24 'transmit':33 'vibrat':11,15,20 'weight':34

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