| abstract |
High-specific-gravity micronized particulates, added to cement slurries in conjunction with certain high-molecular-weight water-soluble polymers, improve fluid-loss control of cement slurries during placement in subterranean wells. The particulates may have a specific gravity higher than 3, and a median particle size smaller than 3 μm. The particulates may include barite, manganese tetraoxide, titanium oxide, iron titanium oxide and aluminum oxide. |