https://www.slb.com/zh-cn/products-and-services/innovating-in-oil-and-gas/well-construction/drilling-fluids/drilling-fluid-additives/wellbore-strengthening-materials/sack-black-asphaltite-shale-inhibitor
SACK BLACK Asphaltite Shale Inhibitor | SLB
Helps reduce HPHT and dynamic fluid losses, torque, drag, and filter-cake thickness.
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