and other weighting agents they are used over a broad temperature range they are used to make stable slurries of solid additives after the use of any fluids but especially gelled oils in many of these applications including remedial treatments in cases in which solids are left in the wellbore or in surface or subsurface equipment or lines it may be appropriate to use a recyclable gelled oil system to remove the solids from the wellbore or elsewhere gelled oils are also used outside of wellbores for example as slugs or u201c pigs u201d for cleaning out coiled tubing or surface or seafloor pipelines or conduits gelled oils are also used outside the oilfield for example in pharmaceuticals in cosmetics for protection of electrical devices and optical cables and in some applications for example cleaning equipment after manufacture recyclable gelled oils may be useful a typical conservative coiled tubing ct cleanout with recyclable gelled oil is conducted as follows the well for example approximately 1850 m approximately 6070 feet deep is completed with perforated 7 30 cm 2 u215e inch tubing and 67 m 220 feet of solids must be cleaned out 3 8 cm 1 u00bd ct is used the ct is filled with diesel and run in hole without circulating the well is then opened to flow at about 0 69 mpa 100 psig above the trunkline pressure washing the fill is started while advancing the ct and circulating diesel to a depth about 15 2 m 50 feet below the top of the fill the tubing is pulled to about 6 1 m.