VERSATROL Asphaltic Resin | SLB


Asphaltic resin

Schlumberger Oilfield Services

VERSATROL resin is a naturally occurring asphalt used for high-pressure, high-temperature (HPHT) filtration control in all VERSA oil-based systems. It is often used to seal low-pressure and depleted formations.

Typical Physical Properties
Physical appearance Black powder
Specific gravity 1.04–1.06
Bulk density ~34 lbm/ft3 [540 kg/m3]
Melting point >400 degF [204 degC]
Ash content <3%


VERSATROL resin reduces both API and HPHT fluid loss in all oil-based muds. It helps improve the overall emulsion stability, thermal stability, and suspension characteristics of most oil-based formulations. VERSATROL resin also increases viscosity, especially at lower temperatures due to its partial solubility.

Typical concentrations range from 2 to 8 lbm/bbl [5.7 to 23 kg/m3], with occasional daily additions in the 0.25 to 0.5 lbm/bbl range [0.71 to 1.43 kg/ m3]. High-temperature situations and special applications require higher concentrations, as much as 10 lbm/bbl [29 kg/m3].

When used in the initial formulation, it is recommended to add VERSATROL resin last. For existing systems, the product can be added at any time, mixed slowly during at least one complete circulation. Monitor solids control equipment for several circulations to ensure product is not discarded. Pilot testing is advised to determine the necessary treatment to achieve the desired results and to observe the change in mud properties.


  • Reduces API and HPHT fluid loss in all VERSA oil-mud systems
  • Enhances emulsion and thermal stability
  • Effective at all temperatures


  • Environmental restrictions concerning the use of oils and oil-based fluids should be considered since VERSATROL resin 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 described in the Material Safety Data Sheet (MSDS).

Packaging and storage

VERSATROL resin is packaged in 50-lbm [22.7-kg] and 55-lbm [25-kg] multiwall paper sacks. Store in a dry, well-ventilated area. Keep container closed. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink-wrapping, and stacking.