ausblenden:
Schlagwörter:
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Zusammenfassung:
To assess the ability to produce a borehole with jet drilling technology, several different rock properties were measured on a suite of rock types. Test include: Uniaxial Compressive
Strength (UCS); Acoustic wave speeds (vp & vs, unconfined); Triaxial deformation tests, Tensile strength tests; porosity measurements; and permeability measurements amongst others. The tests have been done at the rock deformation laboratories at GFZ, TU Delft and DTU. In some cases, duplicate tests have been done to check for consistency across facilities.
As the SURE project advanced, a focus to some specific rock types emerged. These include: Gildehaus (Bentheim) Sandstone, used as benchmark rock type; Flechtinger sandstone, lateral equivalent for the Rotliegend sandstone, a reservoir rock in the Netherlands and Germany; Kohlenkalk (limestone), a target for ultra-deep geothermal (UDG) projects; Interlayered sediments in lava-sequences, a target for jetting in a field-test in Iceland; and Buntsandstein (sandstone), particularly from Bad-Dürkheim, as analogue rocks for Triassic sandstone reservoirs in the Netherlands; and Austin and Welton chalk as analogue rocks for chalk reservoirs. However, more rock types have been tested, but not to the same level of completeness. The data itself might still be useful for other projects, and is therefore also reported here.
A comprehensive overview of all data (averaged when applicable) is depicted in the table below (section 2). This is followed by notes on the used methods and apparatuses (section 3), followed by detailed description of individual tests (section 4). In case of multiple tests, curves of representative tests are shown here.
