Xpacer-450-Spacer-Cement Additives

The most important function of oil & gas well primary cementing is to isolate the various zones within the wellbore.
In others words, the cement must prevent fluids or gases in one particular zone from mingling with those of another. A properly designed and placed cement slurry accomplishes this by creating the necessary seal between the casing and the formation. The cement must prevent migration or fluid channeling throughout the cement.
Today’s well cement systems must perform in a variety of down hole conditions, from 0 °C – over 350 °C., and at bottom hole pressures in excess of 30,000 psi.
PEPCO has developed a complete line of cement additives, which modify the characteristics and performance of the cement slurry. This means that a slurry can be designed to function over the wide range of conditions that occur in the wellbore.

Xpacer-450 was developed for use at temperatures to 450 Fahrenheit (232.2 Celsius). Xpacer-450 is thermally stable and yields a non-settling fluid at service temperature. Thermal stability of the extreme-temperature synthetic polymer allows modification of both the rheological properties (Yield Point) and density of Xpacer-450 at service temperature for project-specific well conditions and specific applications. By optimizing the rheological properties of Xpacer-450, the drilling fluid can be displaced while eroding the filter cake from the formation. This helps prepare the wellbore to receive cement to allow for bonding and effective zonal isolation. Based on an extreme-temperature synthetic polymer, Xpacer-450 offers technical advantages over traditional clay mineral or natural polymer spacers including very fast hydration and greater thermal stability. Xpacer-450 is not limited to drilling fluid (mud) type and acts similar to typical water-based spacers for wettability and compatibility, though the surfactant package should be verified whenever the mud is changed.