MIL -SEAL is a lost – circulation material containing a blend of granular,
flicker, and fibrous material available in three different grind size (Coarse,
medium, and fine).
MIL – SEAL is added to combat a severe lost
– circulation problem. Pretreatment of the mud is sometimes done but not
generally recommended as screens must be bypassed facilitating a buildup of low
– gravity solids. The fine ground product can be added in low concentration of
5.7 to 14.3 kg/m3(2.0 to 5.0 lb/bbl) to aid in sealing
microfissures. This product will pass though maximum of a 20 – mesh screen.
MIL – SEAL is normally recommended in
concentration of 57.0 to 85.5 kg/m3 (20.0 to 30.0 lb/bbl) Mixed s a
slug of 15.9 to 31.8 m3 (100.0 to 200.0 lb/bbl) and spotted next to
the zone of loss. This slurry is placed at a reduced pump rate with large
nozzle bit or open – ended pipe.