DISADVANTAGES OF TREATED BENTONITE
HIGH COST
LESS YIELD
FLOCCULATION
EXCESSIVE VISCOSITY
Adding treated bentonite to cement, causes unacceptable increases in viscosity.
FERMANTATION
While adding biopolymers like starch and xhantum gum to the bentonite, polymers ferment under the affect of bacteria depending the conditions. As a result , polymers loose their function and treated bentonite definitely can’t perform as desired. Furthermore by-products formed as result of fermentation , may negatively affect bentonite too.
In cases of long term stocking, depending the heat and moisture of environment, bacteria from surrounding infects the bentonite.
Moreover, there may be directly in the bentonite itself but because of the reason that bentonite is inorganic , these bacteria can’t directly affect bentonite on the other hand these bacteria may destroy the properties of bentonite thanks to existence of said additives in the bentonite. In conclusion, bacteria affect no bentonite but treated ones.
DISEASES AND ENVIRONMENTAL CORRUPTION
In the first stages of drilling especially in the levels, where surface water exists , the drilling mud being used is very important for human health and environment. Slurries being applied in these stages and levels, definitely mustn’t harm the human health and environment. If the drilling mud of these levels are prepared by treated bentonite chemical escapes in treated bentonite injects surface water by filtration and causes corruption . The chemical and / or biological corruption of surface water is a serious treat for human health and environment.
INCAPABILITY OF PLASTERING
During the drillings performed with soda – treated bentonite, when it is reached to aquifer, soda in the circulating mud melts , salinity of circulation fluid increases and plastering capability of mud decreases. Soda-activated bentonite can’t perform a normal plastering in drillings in brine zones.
LOW CARRYING CAPACITY
When treated bentonite is added to cement excessive gel formation occurs and this decreases the carrying capacity of.