Low-density and low-porosity cementing slurry for oil wells or the like
OwnerBruno Drochon, Andre Garnierinventors
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Abstract
The invention relates to a cement slurry for cementing an oil well or the like, the slurry having a density lying in the range 0.9 g/cm3 to 1.3 g/cm3, and being constituted by a solid fraction and a liquid fraction, having porosity (volume ratio of liquid fraction over solid fraction) lying in the range 38% to 50%. The solid fraction is constitued by a mixture of lightweight particles, microcement and optionally portland cement and gypsum. Such cements have remarkable mechanical properties due to their very low porosity in spite of having very low density.
Claims27
A well cementing slurry, comprising a solid fraction and a liquid fraction and having a density in the range 0.9 g/cm3 to 1.3 g/cm3 and a porosity from about 38% to about 50%, wherein the solid fraction comprises:
- 70% to 85% by volume of the solid fraction of a first component comprising particles having a mean size lying in the range 20 microns to 400 microns and a density of less than 2 g/cm3;
- and
- 15% to 30% by volume of the solid fraction of a second component having a mean particle diameter lying in the range 0.5 microns to 5 microns and comprising cement.
A well cementing slurry, comprising a solid fraction and a liquid fraction and having a density in the range 0.9 g/cm3 to 1.3 g/cm3 and a porosity from about 38% to about 50%, wherein the solid fraction comprises:
- 50% to 60% by volume of the solid fraction of a first component comprising particles having a mean size lying in the range 100 microns to 400 microns and a density of less than 2 g/cm3;
- 30% to 45% by volume of a second component comprising particles having a mean size lying in the range 20 microns to 50 microns;
- and
- 5% to 20% by volume of the solid fraction of a third component having a mean particle diameter lying in the range 0.5 microns to 5 microns and comprising cement.
A well cementing slurry, comprising a solid fraction and a liquid fraction and having a density in the range 0.9 g/cm3 to 1.3 g/cm3 and a porosity from about 38% to about 50%, wherein the solid fraction comprises:
- 60% to 90%o by volume of the solid fraction of a first component comprising particles having a mean size lying in the range 20 microns to 350 microns and a density of less than 2 g/cm3;
- and
- 10% to 30% by volume of the solid fraction of microcement having a mean particle diameter lying in the range 0.5 microns to 5 microns;
- 0% to 20% by volume of the solid fraction of Portland cement having particles with a mean diameter lying in the range 20 microns to 50 microns;
- and
- 0% to 30% by volume of the solid fraction of gypsum.
Dependencies are inferred from the claim text.