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144 Part II Gas Drilling Systems

SUMMARY

This chapter provided a method and a procedure for selecting compres-
sors for air and gas drilling. It involves predictions of the minimum required
gas injection rate, the minimum required gas injection pressure, and the mini-
mum required compressor power. The minimum kinetic energy criterion is
recommended for hole cleaning evaluations. Local ambient pressure, tempera-
ture, and air humidity should be considered when selecting air compressors.

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