Case History

STAR SHIELD® Extends Mud Weight & Eliminates Intermediate Casing in the Permian Basin

United States

Delaware Basin wells have a high potential of encountering an influx of gas and water while drilling through the Bone Springs Formation. Mud weights typically are increased to control the risk of influx. However, higher mud weights may exceed the fracture gradient of the fragile Cherry/Brushy Canyon Formations, resulting in costly whole mud losses.


The operator utilized STAR SHIELD® through the active system with concentrations ranging from 8-10 lb/bbl. STAR SHIELD creates a fast, effective barrier or shield across permeable formations. The operator drilled through the formation without influx of gas and water, while eliminating the intermediate casing string.


The operator drilled to total depth with extended mud weights. Maintaining the concentration of STAR SHIELD throughout the circulating system. The operator safely eliminated the intermediate casing string and drilled to total depth with full returns.