Development and Evaluation of a Compound Set Cement for Well Cementing

Cement slurry of different densities were prepared and studied on their pumpability, mechanical properties, contamination tolerance, bonding strength and cleaning at different temperatures. Compound set cement with densities ranging from 0.8 g/cm³ to 1.80 g/cm³ can be made by adding light weight agent or weighting agent and epoxy, combined with settling preventer. Using solidifying agents such as aromatic amines of different activity, and solidification accelerator to treat cement slurry, the cement slurry can be pumped at 45-125℃. The compound set cement has mechanical property much better than that of the elastic tough set cement modified with rubber powders. The compound set cement is resistant to oil base mud contamination, and has higher bonding strength. The residue compound cement slurry can be readily cleaned with 20% alcohol.