These are spontaneous mud loss into development given that the development is exposed to drilling fluid in advance of filter cake is Make up on wall of wellbore. Higher the permeability much more will be spurt losses. Peak of fracture: width of fracture entrance = six: 1, the coincidence https://drillingfluidformulation55420.thebindingwiki.com/9144995/not_known_facts_about_lost_circulation_in_drilling