Flag:
1.A piece of cloth, rope or nylon strand used to mark the wireline when swabbing or bailing.
2.
An indicator of wind direction used during drilling or workover operations where hydrogen sulfide (sour) gas may be encountered.
3.
In swabbing or bailing, to attach a piece of cloth to the wireline to enable the operator to estimate the position of the swab or bailer in the well.
