As high-quality bentonite reserves become scarcer, it is common practice to add a small amount of polymer to the ore during milling, in order to guarantee that the bentonite will meet the API specification of minimum barrel yield without compromising fluid loss control.
Long-chained anionic polymers will increase mud viscosity by linking clay platelets together, thus these polymers are used as dry extenders to improve the yield of bentonite to API and OCMA specification; or as wet-extenders for use in low-solids, freshwater non-dispersed mud systems. Wet extension is particularly useful when spudding a well or prior to logging operations when extra carrying capacity is required.
Alcomer® 1771 brings additional benefits due to its superior bead form, which gives easy mixing, less dust, good solubility and reliable efficient performance.
Alcomer® 1771 is a low-medium molecular weight, fully anionic polyacrylate produced in BASF’s unique microbead form. The microbead form exhibits excellent handling characteristics and rapid dissolution. It is used primarily in low-solids, non-dispersed fluids to extend the yield of bentonite.
Alcomer® 180 provides bentonite extension and can be more efficient on some clays, but should not be used on low grade ores and is in powder form.