초록 ▼

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 se

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.

대표청구항 ▼

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

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%.