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The Carboniferous in the Well 47 area is dense and hard, with strong abrasiveness and low mechanical drilling speed. According to the correlation between the logging and the completed drilling data in the Carboniferous system, the lithology distribution of the strata in the Che 47 well area was determined, and the bit selection was carried out in combination with the bit wear and broken teeth. At the same time, the optimized drill bit was applied on site. The field data shown that the lithology of the Carboniferous strata in the Well 47 was complex. The upper strata are soft and hard, and the lithology of the lower stratum was dense and hard. The optimized drill bit could increase the drilling speed of the whole well by 4.63 times and the average drill bit increase by 3.84. It achieved the purpose of drilling speed increase, and achieved good application results.

Bit Optimization for Che 47 in Carboniferous Stratum