Well Control - Primary Control Techniques
The following precautions should be observed to ensure that primary control is maintained, whilst tripping, circulating bottoms up after a trip, drilling and circulating on bottom.
Accurate records of all operations shall be maintained, particularly of any unusual occurrences. These shall describe all flowline shows. The duration of the occurrence, mud return gradients, chloride content, etc. shall be also noted.
The hole shall be kept full at all times.
When tripping the drillstring or running the casing, the trip tank must be used for accurate . . .