LIGHTWEIGHT THERMALLY STABLE CEMENT COMPOSITIONS AND METHOD OF USE

摘要

A lightweight thermally stable cement composition and slurry, suitable for lining a borehole having setting temperatures at or below 40 DEG C and anticipated extended anticipated use temperature in excess of 200 DEG C. The cement composition has a lime to silica ratio less than or equal to 1, and the silica has an average particle size less than or equal to about 15 microns. The composition preferably includes silica flour and silica fume and may include 30 % to 100 % by weight of cement blast furnace slag (BFS).