| 摘要 |
A method and system for drilling creating a wellbore which, in at least certain aspects, includes positioning a drilling apparatus at a desired location at the earth surface, the drilling apparatus having rotating and hammering apparatus for simultaneously rotating and hammering a dual tubular string into the earth, the dual tubular string with an outer casing string spaced apart by an annular space from an inner drill pipe string, both the outer casing and inner drill pipe string being hollow, a drill bit secured to a lowermost end of the inner drill pipe string and, optionally, a casing drill apparatus secured at a lowermost end of the casing string, drilling through the earth to form the wellbore by simultaneously rotating and hammering the dual tubular string with the drilling apparatus; and, in certain aspects, installing a geothermal heat loop and grouting the space around it.
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