Cement Preflushes and Spacers
A cement preflush or spacer fluid separates the incompatible drilling mud from the cement slurry. Preflushes and spacers remove drilling mud from the annulus ahead of the cement. They are compatible with water and/or oil based mud, provide fluid-loss control where applicable, and leave the pipe and formation water-wet to enhance the cement bond.
Alpha-Clean™ W - Biodegradable, anionic, environmentally friendly, water-soluble surfactant used to clean oil, wax, dirt, and grease deposits, and allow wetting, penetration & lifting of solids from pipe walls and other metal surfaces. Leaves the surfaces water-wet. Normally diluted 5 to 15% by volume in freshwater and then run as a spacer volume of 500 to 1,000 gallons (1,892 to 3,785 L).
CWS-280 - Powdered blend that can be mixed with freshwater and weighted with barite to produce a variable density cement spacer that remains viscous and supports solids up to 300°F (149°C). Concentration can be varied from 1.5 to 3.0% by weight depending on the desired spacer density.
Mud Clear 48 - Synergistic, anionic blend of surfactants specifically formulated for water-based spacer fluids to improve the cleaning action of the spacer and leave the casing water-wet. Allows water-based spacers to clean holes containing oil-based or emulsion muds. Typical concentrations are 10 to 40 gal/1,000 gal (10 to 40 L/m3) of mixing water for water-based mud and 40-70 gal/1,000 gal (40 to 70 L/m3) for oil-based or emulsion muds.
SWEEP-LC - Specially-treated 100% virgin synthetic monofilament fiber used as chemical wash/spacer fluid additive to increase the suspension and enhance the hole cleaning ability without increasing the fluid’s viscosity. Can also be added to cement slurries to prevent lost circulation in highly porous zones. The typical loading in spacers is 15 lb (6.8 kg) per 30 barrels (4.8 m3).
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