New Design of High-Performance Cement Systems for Zonal Isolation: Influence on Porosity, Rheological Parameters and Chemical and Mechanical Resistance

Abstract

Abstract High-Performance Cement Systems consist of cement slurry designs based on engineered particle size distributions that aim to achieve improved mechanical properties and higher chemical resistance compared to traditional cement slurry compositions. The methodology used to obtain High Performance Cement Systems for Oilwells is based on the Compressive Packing Model, where higher content of solids is achieved by using materials having specific particle size distributions. With these higher solids content slurries, a lower proportion of water is required, and thus improved mechanical properties and better chemical resistance can be obtained. The High-Performance Cement Systems, also called High-Packing Cement Systems, in the present work were designed using the Compressive Packing Model, which was developed to design high performance concretes. Various systems for oilwells were designed in this work using Class G Portland Cement, Silica Fume and Hollow Microspheres. The high-performance cement system properties, such as rheological parameters, compressive strength, porosity and acid resistance are shown and compared to traditional cement systems properties.