Paper: New Expansive Cement System For High Temperature

Expansive cements have been used in oilfield operations to produce better cement bonding which has been reported to help control annular flow, reduce water:oil ratios, and increase casing life by minimizing corrosion from well brines. Previously used chemical cement admixtures have been limited to bottomhole temperatures below 170F, with best results seen at lower temperatures (80 to 120_F). A new cement additive has been developed which produces significant linear expansion in laboratory tests at temperatures above 170F, with quicker expansion development seen as temperature increases. Expansion data for this cement system and field results will be presented to introduce this expansive additive.