... seems to go away if the wells are drilled with water based mud systems. However, certain geological and drilling constraints such as high wellbore temperatures, high deviation directional drilling programs, and differential sticking problems preclude the use of water based muds in certain cases...

... conclusions to be drawn about the density behavior of drilling fluids downhole. thermal gradient average density drilling fluid management & disposal solid content ib gal drilling fluid property drilling fluid formulation wellbore upstream oil & gas water base mud mud column equation...