Reduce number of bit runs from 15
Oil and Natural Gas Corporation Limited (ONGC) in India needed to drill 300 m [984 ft] through a very hard and abrasive intertrappean basalt formation to complete a 2,000-m [6,562-ft] section of a well in the Kutch-Saurashtra block in Western Offshore, Mumbai High. The compressive strength of the formation ranged from 18,000 – 42,000 psi [124.1 – 289.7 MPa]. In two offset wells, the operator required 15 roller cone bits to drill through the same section. The average meterage achieved with roller cone bits was 100 m [328 ft] at an average ROP of 1.1 m/h [3.6 ft/h]. This poor ROP resulted in a high cost per meter.