Aubin's green spacer products CSP-500 and CSS-01 prevent compatibility problems between the cement slurry and the drilling mud, greatly improving mud removal and cement performance. Aubin spacers can be tailored to suit all types of drilling fluid.
The principal purpose of these products is as a pre-treatment for cementing operations to improve bonding to casing and formation through improved mud removal and water wetting. This function is key to achieving a strong cement bond for well integrity.
Example: During cementing operations CSS-01 would typically be deployed at a volume that provides a 500ft long column in the annulus ahead of the cement slurry.
The efficient removal of drilling fluids is essential to successful cementing operations. Mud remaining on pipe or formation surfaces, or present as channels through the cement commonly cause loss of isolation of permeable zones under different pressures. The well bore must be cleared to remove drilling fluids and leave surfaces water wet. This in turn leads to a good cement bond.
Cement spacer CSP-600 is normally mixed at wellsite using CSP-600 plus water and weighting agent to provide a finished spacer fluid with range of fluid densities.
Improves mud removal & zonal isolation
Prevents mud/slurry incompatibility problems
Wide range of fluid density, depending on weighting agent 1.0 – 2.4 g/ml (8.6 – 20 lb/gal)
Good fluid loss control properties, depending on final spacer composition
Water-based, mixed using freshwater, seawater or brine
Stable up to 149°C (300°F).
Due to the variation in drilling mud and cement slurry composition, laboratory fluid compatibility tests should always be run prior to performing a cement job
Anti-settling Agent CAS-04 is a powder additive designed to prevent sedimentation of slurries at bottomhole temperatures lower than 150°C (302°F).
CAS-04 by its nature will increase the rheology of a cement slurry. The magnitude of the increase depends on the cement type, slurry design and density, always run lab tests using representative samples & conditions prior to job execution.