The purpose of using Gilsonite in cementing oil wells is mainly to lighten the slurry and increase its volume. Gilsonite is a solid hydrocarbon that belongs to the category of asphalts. The type of this mineral used in cementing wells has fine and coarse black grains. Gilsonite used in cementing oil wells is a mixture of fine and coarse black grains. This mixture should be such that it does not block the grout channels and at the same time, it should not be too small that it cannot fill the seams and gaps of the formations. Gilsonite grain size is in range of 200-325Mesh, because these grains have low shear strength, they break under high pressure.


Gilsonite in Cementing Oil Well