A little sprinkle of Barite also helps control downhole pressure
Bentonite also provides viscosity to transport cutting from the hole, reduces fluid loss by caking the hole wall, and forms a gel (as you mentioned) to suspend cuttings when pumping needs to stock (e.g. drill pipe connection) rather than all the dirt falling back to the bottom of the hole!
Is this 5 letter word really that scary?, page-60
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