Patent ID: 6874578

Claim:
A method of cementing an oil well or the like, comprising: a) forming a cement slurry comprising: i) a solid fraction constituted by 35% to 65% by volume particles with an average diameter in the range 200 μm to 600 μm, 20% to 45% by volume ordinary Portland cement, and 5% to 25% by volume particles with an average diameter in the range 0.5 μm to 5 μm; ii) a surfactant; and iii) water, the water content of the slurry being less than 50% by volume of the slurry; b) foaming the slurry by introduction of gas; and c) injecting the slurry into the well and allowing it to set; characterized in that the water content of the slurry is less than 50% by volume before foaming.