Hello everyone,

I have few questions about lost circulation.I would love it if anyone can throw light on it and help me solve these issues.

How much magnitude of mud lost classifies it under lost circulation?
If the mud weight is too high does the rock fail in tension?

does shear failure also occur in form of breakouts in it? what is shear failure by breakout?

does hole diameter reductions also happen due to swelling clays in it? what is the process of diameter reduction called and what it causes if it doesnt effect lost circulation in any way.

Thankyou.