Oil-well cement with silica to produce light weight cement

Details Oil-well cement with silica to produce light weight cement Oil-well cement with silica to produce light weight cement

C - Chemistry, Metallurgy

04

B

31/12

C04B 7/26 (2006.01) C04B 18/14 (2006.01) C09K 8/42 (2006.01) C09K 8/46 (2006.01)

Patent

CA 1140324

ABSTRACT OF THE DISCLOSURE A cement slurry of low specific density for cementation of oil-and gas wells is produced by mixing oil-well cement with finely divided emission products comprising amorphous silica dust which has been obtained during the electro- thermal preparation of ferrosilicon and/or silicon metal, water, and any desirable dispersion components, the emission products being added in an amount in the range of 1-50% of the total weight of dry material. The emission products can either be mixed with the cement while both components are in the dry state whereupon there is added a sufficient quantity of water in order to obtain a desired specific weight of the slurry or first mixed with water and any other desired dispersion components and this slurry is mixed with the oil well cement.

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