SUPPLEMENTAL TABLES

Table 1

Ratios of the areas cut by hole openers compared to areas cut by pilot bits for the major hole opener/bit pilot combinations

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TABLE 2

Weight & RPM Recommendations for Hole Openers (Wt. in 1000 lbs.)

Soft shale, sand, red bed, etc.

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Table 3

Medium Shale, Sand, Lime

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Table 4

Hard Lime, Dolomite, Quartzite