In this century, Gilsonite is known as a lost circulation material (LCM) and one of the components that can be used for primary cementing operations in a special environment and tough drilling zones. When Gilsonite is added to cement during drilling operations it enhances the characteristics that are critical to effectively cementing the wellbore, isolation of formation fluids and preventing annular gas flow.
PUB-LTD Gilsonite has unique physical and chemical properties that provide various important benefits for slurry and cementing. Seven benefits in slurry and eight benefits in set cement are as follows:
Cement Slurry Benefits:
Yield increase
Reduction of slurry weight
Control of Free Water
Slurry Water Ratio Reduction
Lower ECDs
Lost Circulation Inhibition
Improvement of Mud Removal and Wellbore Washout

Gilsonite in Oil Well Cementing
The researchers conducted tests and found out that gilsonite performed highest in compressive strength testing under conditions of 100 -150 ˚C and up to 3000 psi. Gilsonite prevents the leaking of formation fluids when it is used as an additive in well cementing. It is generally polymer based. It acts as a shale stabilizer, preventing wellbore instability problems.

Set Cement Benefits:
Maintainance of Compressive Strength
Cracking Reduction
Increase in Flexibility
Improvement of Microfissures
Permeability Reduction
Strengthening of The Correlation Between Formation and Casing
Minimization of Environmental Risks
Strengthening of Zonal Isolation

Gilsonite Fixes Free Water Problems:
PUB-LTD Gilsonite helps the stabilization of the slurry and eliminates the need for additional free water control agents and extra costs as well. Also, it plays an important role as a lost circulation material (LCM) to prevent water channeling and improve zonal isolation.

Gilsonite Maintains Isolation by Self-Healing:
Gilsonite manufactured by PUB-LTD has an amazing self-healing property that results in its flexibility, deformability, swelling ability, impermeability, and non-porous structure. With these properties and abilities, it can mend microfissures in the cement sheath.