VERSACOAT HF High-Flashpoint OBM Emulsifier | SLB


High-flashpoint oil-based mud emulsifier

Schlumberger Oilfield Services

VERSACOAT HF emulsifier has a much higher flash point, ideal use in areas that require this added safety feature. Secondary benefits include improved thermal stability and high-pressure, high-temperature (HPHT) filtration control. The product is effective over a wide temperature range, in the presence of contaminants, and for reducing the adverse effects of water contamination.

Typical Physical Properties  
Physical appearance Dark amber, viscous liquid
Specific gravity 0.90–1.00
Flash point 170 degF [76.7 degC] (Pensky–Martens closed-cup test)
Pour point –20 degF [–28.9 degC]


VERSACOAT HF emulsifier functions as a wetting agent and secondary emulsifier when used in conventional, low fluid-loss, high-lime systems in combination with VERSAMUL versatile emulsifier package. In this application, the product oil-wets barite and drill solids to prevent water-wet solids; improves thermal stability, rheological stability, filtration control and emulsion stability; and improves the fluid’s resistance to contamination.

Concentrations for initial formulations range from 1 to 3 lbm/bbl [2.85 to 8.6 kg/m3] when used as a wetting agent, with occasional daily treatments of ~0.063 lb/bbl [0.18 kg/m3]. VERSACOAT HF emulsifier functions as the primary emulsifier when used in relaxed-fluid-loss, lower-lime systems, in combination with VERSAWET oil-based mud surfactant. In this application, the product forms a stable, oil-in-water emulsion and provides a degree of oil-wetting.

Concentrations for initial formulations range from 2 to 8 lbm/bbl [5.7 to 22.8 kg/m3] when used as the primary emulsifier, with daily treatments of ~0.125 lbm/bbl [0.36 kg/m3]. High-temperature applications and some light mineral oils require higher concentrations of VERSACOAT HF surfactant.

The recommended treatment levels depend on the oil-water ratio, anticipated temperatures, desired properties and the other products used in the formulation.

The VERSA system family includes


  • Improves emulsion stability
  • Improves oil-wetting and prevents water-wet solids
  • Maintains stable oil-in-water emulsion and helps prevent water in HPHT filtrate
  • Improves thermal stability, rheological stability, filtration control and contamination resistance of oil-base muds
  • Effective at counteracting the adverse effects of water contamination such as high viscosity, low-emulsion stability and water-wet solids


  • Over treatment with VERSACOAT HF surfactant may thicken VERSAPORT systems under certain conditions.
  • Environmental restrictions concerning the use of oils and oil-base fluids should be considered since VERSACOAT HF surfactant is used in conjunction with oil.

Toxicity and handling

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions as described in the Material Safety Data Sheet [MSDS].

Packaging and storage

VERSACOAT HF surfactant is packaged in 55-galUS [208-L] drums. Store in a cool, well-ventilated area away from heat, sparks and flame. Keep containers closed and tightly sealed.