A generic name widely used for a black, lustrous, carbonaceous resin classified as an asphaltite. An important characteristic of gilsonite is its softening-point temperature . In oil-base muds, it is used as a fluid-loss control agent. Being a hydrocarbon, it is naturally wetted by the oil. In water-base muds, it is used as a shale-stabilizing additive and is difficult to evaluate unless tested at or above its softening point. As a hydrocarbon, the powder must be coupled to water by using a glycol or similar water-wetter.

  • natural bitumen
  • natural asphalt rock
  • gilsonite