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Unformatted text preview: ge on TFA combined with the reduction on the flow rate reduces
the bit hydraulic from 2.1 hp/ in.2 to 1.2 hp/in.2.
Fig. 14 shows ROP and DSE vs. depth for the field case No. 2 from 11,000 ft to 14,900 ft. The average ROP at the end of
the first bit (from 12,400 ft to 12,800 ft) is around 75 ft/hr, but the average ROP at the beginning of the second bit was only
around 35 ft/hr (from 12,800 ft to 13,200 ft). The average ROP drops to 15 ft/hr for the last 500 ft of the well. DSE has a
steady behavior for the first bit with an its average value progressively increasing from 30,000 psi at 11,000 ft to 70,000 psi
at 12,800 ft. DSE becomes increasingly erratic since the beginning of the second bit with values above 600,000 psi from
14,000 ft to 14,500 ft. The trend for the average DSE shifts to the right on the second bit.
Fig. 15 shows the drilling parameters (ROP, WOB, RPM, torque, and HSI) for the same section included on Fig. 14. The
average WOB increased from 8,000 lb for the first bit, to 13,000 lb for the second bit. The...
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