BAKER HUGHES - Drilling Fluids Reference Manual

Oil / Synthetic Fluids
OMNI-MUL ®
OMNI-MUL ® is a high-temperature, environmentally safe, polyamide used as a non-ionic emulsifier
and wetting agent in synthetic and oil-base fluid systems. It readily stabilizes fluids under minimal
shear, is compatible with a wide range of internal phase salinities, and can be used to emulsify calcium
chloride and sodium chloride brines, seawater, and freshwater. OMNI-MUL is substantive (adsorbs
on) to mineral surfaces, reducing interfacial surface energy and is a synthetic wetting agent for MIL-
BAR, drilled solids, etc. Synthetic-base fluid systems usually require 0.5 to 1.5 gal/bbl (11.9 to 35.7
L/m 3 ) of OMNI-MUL (used as the primary emulsifier), depending on the bottomhole temperature,
density, and drilled solids content.
Table 5-21 Typical Physical Properties – OMNI-MUL
Appearance
Dark brown
Specific Gravity 0.928
Flash Point
> 200° F (93.3° C) (PMCC)
Pour Point 40° F (4.4° C)
pH (5% solution) 3.75
OMNI-PLEX ®
OMNI-PLEX ® is an anionic synthetic polymer supplied in emulsion form. It can be used alone or in
conjunction with amine-treated organophilic clays. It is compatible with most additives commonly
used in low toxicity mineral oil- and synthetic-base drilling fluids and is not affected by gas kicks or
H 2 S contamination. OMNI-PLEX is thermally stable at temperatures exceeding 400° F (204° C).
OMNI-PLEX increases viscosity levels in low toxicity mineral oil- and synthetic-base invert emulsion
drilling fluids. It contributes primarily to YP and gel strength to provide carrying capacity for cuttings
and suspension of weighting materials. OMNI-PLEX is added as needed to control low shear
rheology. Normally, 1 to 4 ppb is adequate.
Table 5-22
Appearance
Typical Physical Properties – OMNI-PLEX
White liquid
Flash Point > 250° F (121° C)
Specific Gravity 1.08 - 1.12
Baker Hughes Drilling Fluids
Reference Manual
5-40 Revised 2006