Mica

MICA is used to control lost circulation in water and oil base drilling fluids. MICA is made available in fine (F), medium (M), and coarse (C) grades.
MICA is inert and can be used both in water and oil-based drilling fluid with no negative effect on drilling fluid properties.
The fine grade of MICA can be circulated through a 20 mesh screen. Larger grades will be removed from the system unless the solids control equipment is bypassed.

Category:
Requirement Standard
Density 4.10gr/ml, minimum
Water-soluble alkaline metals as calcium 250 mg/kg, maximum
Residue greater than 75 Maximum mass fractin,3.0%
Particles less than 6 in equivalent spherical diameter Maximum mass fractin,30%
TEST No. unit Specification
pH at room temp & 180 F – 6.5
Specific Gravity – 4.2
Residue on ASTM sieve No.200 – 3
Residue on ASTM sieve No.325 % 10 ± 5
Water Soluble Solids % 0.1 Max
Apparent viscosity before/after Adding Gypsum cPs 125 Max
Soluble alkaline earth metal as calcium PPM 250 Max