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Index Terms Links

Gas drilling systems (Cont.)
downhole equipment in 114
flat-bottom bits 114 115

float valves 115 116
gases used in 109 119 147
See also Natural gas drilling system
rotating head 113 113
schematic diagram of, 110
surface equipment in 109
Gas flow. See also Flow

in deviated holes 125
mechanics of 119
through the bit 127
in vertical holes 120
Gas holdups 174
Gas injection methods

drill string 214 214
parasite casing 217 217
parasite string 215 216
through completion 217 218
Gas injection pressure 138
Gas injection rate
hole cleaning criteria 128

low 128
minimum 138
mud rings and 151
requirements 128
water removal 154

wellbore washout and 159

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