Spacers for cementing

Spacers for cementing

Spacers are any fluids other than cement slurry or mud, pumped ahead (preflush) or behind (postflush) the cement slurry.

Preflushes are used to:

  • prevent contamination of cement slurry with mud
  • improve mud displacement and mud cake removal.

Postflushes are used to prevent:

  • the plug from spinning when it will be drilled out (cement on top)
  • contamination with the fluid used for displacement.

General Guidelines

The following guidelines shall be adhered to during the use of spacers: