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Basic Knowledge
5.8 The spacer
  • Detailed description

Generally, after the washing liquid and the cement slurry is mixed, they will pollute each other. In order to prevent the pollution, usually injected a certain amount of spacer after the washing liquid is injected, the spacer will not have reaction with the washing liquid and the slurry. The spacer with a certain mount of additives will have a bigger viscosity and also have suspension. It can replace efficiently the drilling mud and can prevent the slurry and drilling fluid mixing. Also it has good compatibility with the drilling fluid and additives.
The kelioil CS210S series spacer has good thickening effect is remarkable. And it has a high viscosity with a low density. It has good suspension for the weighting agent and insoluble solid or oil drop. It has high stability in saline or acid/ alkaline solution. It has a higher viscosity and can soluble in cold water.
Strictly, the spacer and washing liquid is not well cement admixture, but generally the spacer and washing liquid can make the slurry replacement efficiency increasing and inhancing the cementing quality, so t the two products are also called oil well cement additive.
Table 8-1 is the kelioil CS series spacer’s performance index
Table 8-1 the spacer’s properties requirements

Item

Technical index

Marsh funnel viscosity, s

≥200

Viscosity , mPa·s        

≥5000

Note :1:The Marsh funnel viscosity is the time of 946ml spacer running off from the marsh funnel.
2:In the brackets is the test condition.