Rheological Design of Cementing Operations

Abstract

Hydraulic analysis of the wellbore has become increasingly important for designing cementing operations and selecting equipment, materials and techniques to complement modern well-completion practices. Non-Newtonian fiuid technology has advanced beyond the point where former empirical methods of analysis adequately define the hydraulic system and fluid properties. In view of these factors, this paper describes a series of rheological calculations which have been found practical , through field usage, for assistance in selecting a cementing program. A relatively simple laboratory method using standard viscometric equipment is suggested for determination of the rheological properties of slurries, and data are presented on some of the more common cementing compositions. A criterion for divergence from laminar-flow characteristics has been proposed. Usefulness of the calculations is indicated by examples of cementing operations where they have been used.