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Line 55:
Line 55: − +
→Gas detection
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| Trip gas
| Trip gas
| Formation gas that enters the wellbore when the drill string is being “tripped” or pulled out of the wellbore. The contributing formation must be underbalanced at some point within the wellbore; such underbalance is due to the “swabbing” effect caused by pulling the drill string out of the hole.
| Formation gas that enters the wellbore when the drill string is being “[[trip]]ped” or pulled out of the wellbore. The contributing formation must be underbalanced at some point within the wellbore; such underbalance is due to the “swabbing” effect caused by pulling the drill string out of the hole.
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| Recycled gas
| Recycled gas