Earth loop installed with sonic apparatus

  • US 7,270,182 B2
  • Filed: 08/18/2006
  • Issued: 09/18/2007
  • Est. Priority Date: 07/03/2003
  • Status: Active Grant
First Claim
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1. A method for installing a heat exchange pipe loop in a borehole, the method comprisingdrilling a borehole from an earth surface down into earth using sonic apparatus with a sonic drill head, the sonic drill head having casing connected thereto, drill apparatus connected to a lower end of the casing so that movement of the casing by the sonic drill head drills the borehole down into a formation in the earth, the formation having voids, the casing having an interior, said drilling resulting in a displaced volume of earth displaced by advancement of the casing into the earth,pumping drilling fluid down into the casing during drilling, down through the casing and out through the drilling apparatus, and upwardly in an annular space between an interior surface of the borehole and an exterior surface of the casing so that drilled material flows upward through the annular space in the borehole preventing drilled material from flowing up into the casing'"'"'s interior, the drilling fluid pumped at a drilling fluid pumping rate,lowering a heat exchange pipe loop down into the casing,introducing grout into the casing around the heat exchange pipe loop, the grout displacing an amount of the mixture of drilling fluid from within the casing,extracting the casing from the borehole,maintaining the drilling fluid pumping rate so that a volume of pumped drilling fluid is greater than the displaced volume of earth, andvibrating the casing with the sonic drill head thereby facilitating flow of drilled material into the voids in the formation being drilled.

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