MEGADRIVE S Secondary OBM Emulsifier | SLB


Secondary high-performance OBM emulsifier

Schlumberger Oilfield Services

The MEGADRIVE S secondary high-performance OBM emulsifier is a concentrated and powerful emulsifier with drill solids wetting capability designed to be paired with the MEGADRIVE P primary high-performance OBM emulsifier for nonaqueous drilling fluids. The MEGADRIVE S emulsifier aids in stabilizing emulsions, which leads to better emulsion stability, oil wetting of drill solids, and HPHT fluid loss reduction. It is also useful as an oil-wetting agent for drill solids, thereby reducing the adverse effects of water and drill solids contamination.

Typical Physical Properties 
Typical Physical Properties Physical appearance   Dark-amber, viscous liquid
Typical Physical Properties Specific gravity   0.98
Typical Physical Properties Flash point via the Pensky-Martens closed-cup method (PMCC)   200 degF [93.3 degC]
Typical Physical Properties Pour point   14.8 degF [–26.0 degC]


  • Reduces initial mixing and maintenance costs by reducing the amounts of other surfactants needed
  • Helps prevent water in HPHT filtrate, results in reduced HPHT fluid loss
  • Counteracts the adverse effects of water and solids contamination
  • Improves thermal stability, rheological stability, filtration control, and contamination resistance of oil-base mud


Concentrations for initial formulations range from 1 to 3 lbm/bbl [2.85 to 8.5 kg/m3], but a pilot test is required for optimal results. The recommended treatment levels depend on the oil-water ratio, anticipated temperatures, desired properties, and the other products used in the formulation.


There should be a 3:1 ratio of MEGADRIVE P emulsifier to MEGADRIVE S emulsifier in typical applications. Because the MEGADRIVE S emulsifier is used in conjunction with oil, environmental restrictions concerning the use of oils and oil-based fluids should be considered.

Toxicity and handling

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions described in the Safety Data Sheet (SDS).

Packaging and storage

The MEGADRIVE S emulsifier is packaged in 55-galUS [208-L] drums and 275-galUS [1,000-L] totes. Store in a dry, well-ventilated area. Keep container closed. Keep away from heat, sparks, and flames. Store away from incompatibles.