Drilling Losses Remedial Techniques
In general, to cure lost circulation, you have to follow two major steps:

- First, Make an assessment of the severity of a loss zone. ( see table-1)
- Second, Match the remedial material and below techniques to it in terms of both the size of the material and its function.

Prevention of mud loss is critical, but because lost circulation is such a common occurrence (check also: causes of mud losses), effective methods to cure lost circulation are also a high priority.
https://www.drillingmanual.com/remedial-curing-lost-of-circulation/