Schlumberger

D500 GASBLOK LT

Low-Temperature Applications

The D500 GASBLOK LT cement additive, a suspension of polymeric microgels, creates an impermeable barrier to prevent annular gas migration into the cement slurry during the critical hydration period. The microgels form an impermeable cement filtercake that blocks gas flow.

The ability of the slurry to stop gas migration is directly related to additive concentration, which depends on two factors: bottomhole circulating temperature and slurry solid volume fraction.

Applications can be designed using fresh water and seawater.

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