Acoustic method and apparatus for drilling boreholes

摘要: 1,140,996. Boring earth c and the spacing is held by a pressure sensor or fingers depending from plate. The frequency of pulses may be high enough to cause cavitation fluid which sufficiently dense so that debris fro mdrilling floats upwardly entrained less drilling supplied through drill string slowly circulate entrain finally removed borehole faster flowing above A shock absorber comprising .a neoprene sleeve in spring embedded inserted string. first part bored conventional methods;