Composition for a lightweight cement slurry for cementing oil and gas wells
AssigneeDowell Schlumberger Incorporated
InventorsPhilippe Parcevaux, Patrick Sault
Life of this patent
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Abstract
A lightweight cement slurry composition having a density in the range of 1.2 to 1.6, containing a solid extender agent and an SBR latex. The ratio of the liquid volume to the slurry volume should be less than 70% and preferably less than 63%. The lightweight slurry then presents a most attractive set of properties which could not be obtained previously, and in particular gas channelling is controlled.
Claims16
A homogeneous lightweight cement slurry for cementing the annulus of an oil or gas well, comprising:
- cement, an extender in the form of solid particles, a styrene-butadiene latex, and water, having a specific gravity lying substantially in the range from 1.2 to 1.6 and having a volume ratio of the liquid phase of the slurry to the total volume of the slurry of less than about 70%.
A method of cementing the annulus of a wellbore by pumping an aqueous cement slurry through the wellbore and into the annulus said aqueous cement slurry comprising
- cement, an extender in the form of solid particles, a styrene-butadiene latex, and water, having a specific gravity lying substantially in the range from 1.2 to 1.6 and having a volume ratio of the liquid phase of the slurry to the total volume of the slurry of less than about 70%.
Dependencies are inferred from the claim text.