Shear rate has greater influence on cement slurry properties than total mixing energy

Paul Padgett Halliburton Energy Services Duncan, Okla. New laboratory and field-scale research reveals the shear rate that a mixing system provides to a cement slurry has a greater influence than total mixing energy on slurry properties. Because field mixing equipment operates at significantly lower shear rates than typical laboratory equipment, slurry properties in the field frequently do not match the laboratory values, which can lead to a variety of cement-job problems. Slurries designed under high-shear laboratory mixing conditions can result in the wrong combinations of additives or the wrong additive proportions. Several years ago, researchers investigated the problem of...

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