Cementing composition containing a dispersing agent and its application for cementing wells petroleum

摘要

A composition for cementing an oil, gas, water, geothermal, or analogous well includes as its dispersing agent a salt of polyvinyl sulfonic acid in which 0% to 20% of the monomer groups are replaced by acrylic or methyacrylic monomers. The composition is particularly suitable for use in cementing wells in which the temperature does not exceed 85{C. The molecular weight of the salt is in the range 1,500 to 10,000 and it may be used as an aqueous solution.