Lightweight Additive

BW-707 (Lightweight Additive)

Product Information

Description

BW-707 is a lightweight, inert, hollow sphere filled with inert air or gas, typically produced as a byproduct of coal combustion at thermal power plant. BW-707 are now used as fillers in cement to produce low density concrete.

BW-707 consists of inert hollow inorganic spheres which can provide a route for preparing lightweight cement slurries of 9 to 12 lbs/gal that will produce acceptable compressive strengths in short periods. The compressive strengths are normally higher than those produced by equivalent density slurries containing bentonite, gilsonite or silicate extenders.

Applications

BW-707 have been used in oilfield cementing for quite some time. During a cementing job, BW-707 act to decrease the slurry density without increasing the water content. This in turn provides better compressive strength to the cement.

BW-707 is limited by pressure in its application, but the material is competent up to 6000 psi. As the pressure increases, some of the spheres fail and the density increases.

BW-707 improves early compressive strength development. Set cement has improved heat insulation properties. It functions as a lost-circulation aid. It increases slurry volume yields because of the bulk density of BW-707.