Methylene Blue Capacity MBT
The Methylene Blue Test in combination with assumed or measured drilled-solids MBT, is used to further divide the low-gravity solids into inert (drill solids) and active low-gravity solids (bentonite). Soil scientists measure clay activity as cation exchange capacity (CEC); but, in drilling fluid testing, the clay activity is measured as MBT. For practical purposes, MBT (methylene blue, cm 3/cm3 whole mud) is the same number as CEC (meq/100 g solids). Splitting low-gravity solids into drill solids and bentonite is an imprecise classification because the calculated bentonite is based on activity (CEC) and may not actually be commercial API-grade bentonite.
Note: See Section 3 - Testing for additional information.
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