It is very important think about the traits (density, rhea.agy) of the drilling fluid in place earlier than cementing. The fluid greatest displaced by the cement slurry is water.

Any improve in density or rheology of the drilling fluid is unfavorable to its displacement. To attenuate these displacement defects, the density and rheological properties of the cement slurry have to be suitably adjusted, taking account of these of the drilling fluid.

To forestall any slurry contamination that impacts cementing high quality, a spacer is used between the mud and the slurry. This fluid should even have the density and rheology traits enabling it to:

(a) Displace the mud.

(b) Be displaced by the slurry.

To favor the displacement of 1 fluid by one other in an annulus, changes are made on:

(a) The density.

(b) The rheology.

(c) The annular velocity.

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