| 摘要 |
A system for high-depth drilling of the ground aimed at reaching hot rocks for extraction of geothermal energy by means of introduction of a heat-conveying fluid and extraction thereof after adequate heating uses just one borehole containing two coaxial tubes: an internal tube ( 3, 11, 13 ), through which the cold fluid is introduced, and an external or coating tube ( 4, 6 ), through which said fluid returns to the surface after it has been heated by the hot rocks either directly or through said coating tube.
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