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DTH vs PDC in Volcanic Tuff and Basalt: How Bit Switching Strategy Controlled Cost and ROP Across 20 Boreholes in Java and Sulawesi


Staged bit strategy — PDC (20° back-rake) for tuff, DTH (parabolic inserts, 10% Co) for basalt — delivered 3.3× ROP in basalt and 37% lower cost per metre across 20 Java-Sulawesi wells.

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