New Technology Drilling Rig - Stanford University
2007-10-30 · DRILLING To tab geothermal energy in Germany, boreholes of 2,500 up to 6,000 m depth have to be drilled. This is, depending ... system the cylinder drawwork allows to put extra pressure onto the drilling pipes and the bit instead of being limited to ... valve system braking is not dependent of several brake types anymore. Figure 4: Top drive ...
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