Design Considerations for an Inhibitive, Stable Water-Based Mud System

Abstract

Summary This paper discusses the technique of using high-molecular-weight organic polymers to stabilize troublesome shales through the adsorption of a protective polymer layer. It specifically covers the performance of a partially hydrolyzed Polyacrylamide (PHPA) in respect to shale preservation and in the retardation of cuttings dispersion. Other design factors—e.g., pH control, rheological stability, and lubricity—are also covered.