VERSATROL M Asphaltic Resin | SLB


Asphaltic resin

Schlumberger Oilfield Services

VERSATROL M resin is a naturally occurring asphalt used for high-pressure, high-temperature (HPHT) filtration control in VERSA oil-based systems.

VERSATROL M resin has a lower softening point than the regular VERSATROL resin, which makes it suitable for use over a wide range of temperatures. 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]
Softening point 350–400 degF [177–204 degC]
Ash content <3%


VERSATROL M resin is designed to be used in applications where the anticipated bottomhole static temperature does not require the higher limits of the regular VERSATROL resin. VERSATROL M 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 M 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 M 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 after initial addition to ensure the product is not being discarded. Pilot testing is advised to determine the necessary treatment to achieve the desired results and to observe the change in mud properties.


  • Works in a wide range of applications with bottomhole static temperature  (BHST) up to 350 degF [177 degC]
  • Reduces API and HPHT fluid loss in all VERSA oil-mud systems
  • Enhances emulsion and thermal stability


  • Environmental restrictions concerning the use of oils and oil-based fluids should be considered since VERSATROL M resin is used in conjunction with oil
  • Temperature limitation of 350–400 degF [177–204 degC]
  • Exceeding softening point temperature may increase rheological properties

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.

Packaging and storage

VERSATROL M resin is packaged in 50-lbm [22.7-kg] and 55.1 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.