Development of cement slurries for oil and gas wells lining in aggressive environment

The paper presents the results of laboratory studies of the influence of aggressive fluids containing MgSO₄, Na₂SO₄, MgCl₂ and CaCl₂ as well as porosity of hydrated cement have on its strength. Cement samples had been put into brine and after a fixed period of time were tested to measure ultimate compression strength and ultimate flexural strength.

This work represents data on physical and mechanical properties of polymer–cement slurries and cement stone formed on that basis, suitable for cementing wells in conditions of brine aggression. In order to increase corrosion resistance of produced concrete, plug-back mixtures were made with lowered water to cement ratio.