Lost Circulation Material & Zonal Isolation | American Gilsonite


American Gilsonite


As the challenges presented by today’s wellbore configurations increase, a properly designed cementing process is critical to keeping the wellbore isolated, protected and environmentally sound. 

For more than 50 years, the industry has depended on Gilsonite® as a lost circulation material and a critical component for primary cementing operations in some of the world’s toughest drilling environments.

Adding Gilsonite during cementing operations enhances the characteristics that are critical to effectively cementing the casing, isolating hydrocarbon formations and preventing annular gas flow.

With its unique physical and chemical properties, Gilsonite provides a range of important benefits in slurry and set cement that are unmatched by any other single additive.

Cement slurry benefits

Increases yield
Reduces slurry weight
Controls free water
Lowers slurry water ratio
Promotes favorable rheologies resulting in lower ECDs
Prevents lost circulation
Scours wellbore/enhances mud removal

Set cement benefits

Maintains compressive strength, unlike coal or fly ash
Increases flexibility
Reduces cracking
Heals microfissures
Reduces permeability
Strengthens bond to the formation and the casing
Reduces environmental risk
Assures zonal isolation

Gilsonite eliminates the problems of free water
By controlling free water, Gilsonite helps stabilize slurry and eliminates the need for – and cost of – additional free-water-control agents. As a lost circulation material, it also improves zonal isolation by preventing water channeling on the upper side of the wellbore.

Lost circulation material Gilsonite controls free water, improves zonal isolation

Self-healing properties help maintain zonal isolation
Gilsonite is flexible, deformable, swellable, impermeable and non-porous. These characteristics give Gilsonite self-healing properties that can plug induced microfissures in the cement sheath.

Lost circulation material Gilsonite heals microfissures, maintains zonal isolation



See where Gilsonite is used as a lost circulation material to enhance zonal isolation

See where Gilsonite is used as a lost circulation material to enhance zonal isolation

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