A system for non-destructively measuring the strength of a cement slurry sample includes an elongate sample container for receiving a cement slurry sample.

The vibrational energy may be used, for example, to free a stuck tubular, consolidate a cement slurry and/or detect voids within a cement slurry prior to the curing thereof.

The cement slurry may further include cement, water, and a salt that is soluble in the water such as potassium chloride.

A method for determining the density of cement slurry in undersea drilling is disclosed.

A cement slurry containing water, cement kiln dust, and the above-described additive is also described as well as apparatus for recycling the cement kiln dust.

The universal well cement additives improve the properties of a well cement slurry and can be comprised of iron chloride, a dispersing agent, an organic acid, a hydratable polymer and an ultra-fine particulate hydraulic cement.

The weighting agents are usually finely divided to help keep them suspended in the cement slurry.

The cement slurry therefore continues flowing down through the casing and up through the annulus where it sets and forms a strong cement column.

A cement slurry composition comprising a plugging agent polymer with a low Tg point.

Pressure pulses may be applied to fluid in the bore, which fluid may be cement slurry.

Setting of a cement slurry containing one of these additives can be induced at the desired moment by adding a lithium salt.

The invention provides a method of cementing an oil well or the like comprising injecting a cement slurry comprising a surfactant, and foaming said slurry before allowing the cement to set.

The swelling agent substantially inhibits a cement slurry subsequently pumped into the subterranean formation from passing through the permeable zone.

The tool of the present invention shortens or eliminates delays in well operations, thereby improving integrity of cement liners formed by placing cement slurry in a targeted interval.

The cement slurry is formed by mixing together an hydraulic cement, 12 to 24% of silica based on the weight of cement, and water; wherein the silica comprises 1/3 to 2/3 microfine silica and 2/3 to 1/3 silica flour.