Case History Benefits ? ? Reduced well development costs by increased time-on-bit ? ? Average drilling time to failure increased from 20.1 hr to 32.6 hr ? ? Average length drilled per bit was increased from 63.1 m (207 ft) to 79.9 m (262 ft) Background and challenges ? ? Cooper Basin, South Australia ? ? Drilled an 8½-in. diameter vertical well to 11,500 ft Baker Hughes solution and results ? ? 8½-in. Vanguard Geothermal tricone bit w

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