Barytes sag - treatment, prevention and causes
Generally, barytes sag is linked to a rapid change in mud properties, for operational reasons: Increase mw because of kick, reduce mw because of diff sticking pb, thinning mud at TD for the cement job, etc.
- POBM systems are usually very thin and often run at low gels 5/20 and low "low end" rheology. This give very good drilling performance but makes the system sensitive to changes.
- When mud properties are specificaly engineered wells can be suspended for months without sag occuring.
- The procedure to change . . .