Ven-Phalt S™ is a premium sulphonated asphalt additive for shale inhibition and fluid loss control in water based fluid system applications. Ven-Phalt S™ is a multi purpose drilling mud conditioner providing enhanced fluid lubricity, preventing the  water wetting of drilled clays, minimizing the instances of bit balling, promoting good filter cakes and sealing of wellbore micro fractures. Ven-Phalt S™ has a thermal stability up to 500 °F in drilling applications.