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Effect of Micro-MgO-based Expanding Agent on Rheological and UCS Properties of Well Cement at Early Age

Well integrity issue is a major concern not only in the Oil and Gas industry but in the geo-storage field. For CO 2 sequestration, in particular, poor quality cement jobs render wells to suffer from possible CO 2 and formation fluid migration issues. In some cases, this migration issue maybe caused by the micro-fracture or micro-channel created during the chemical shrinkage and bulk shrinkage processes. Using some expandable cement system to cope with this issue is a promising way to mitigate this issue. In this study, we are exploring the effect of a kind of micro-MgO based expanding material on some principal properties of CO 2 sequestration well cement.