BENTONITE::KAR-YBEN

 

It is difficult to procure large amount of natural bentonit with a convenient price because of limited reserve in the world and in our country. Because of that, some additives are added to the low grade calcium baset bentonite, to get, desired properties. These treated bentonites known as bentonite in the market.

 

1. PROPERTIES

          Our company is very sensitive when gets these type of bentonite orders. We make minimum the  known disadvantages by adding 01- 05 % (by weight) special polimer, to the bentonite. Such a yielded / treated bentonite, of our company called  KAR-YBEN and is conforming to TS 977 type 1.  or API bentonite of which  Specification giving below.

22,5 gr KAR-YBEN , Bentonite 350 ml of distilled water suspension, test results,

 

600 RPM Reading, Fann 35 viscometer min.  30
Filitrate Volume max. 15 ml
Yield min.  90 bbl 
Moisture content max. 10 %  (by weight)
Residue on 200 M. wet screen analysis max. 2,5 % (by weight)
Yield Point/Plastic viscosity ratio (YP/PV) max. 3

 

2. APPLICATION

            Treated bentonite, KAR-YBEN, is used as natural  bentonite KAR-BEN for preparing drilling fluids only. But it is very important  to know what  kind  and how much addtive is there in the treated bentonite. KAR-YBEN is being prepared by adding very few  (0,1-0,5 %) special polymer to the low grade bentonite.

3. PACKING  

          50 kg multilayer paper bags, and 1000 kg  big-bags available. The  bentonite KAR-YBEN  is dry, and, easily flowable  grinded form.

 

DISADVANTAGES OF THE TREATED BENTONITES;

* There are two methods to increase the quality of the bentonites, (1) ion exchange (2) adding chemicals. If it is  well washed after prosessing, first method is ok. But additives, especialiy polymeric additives can cause unexpected problems.

* At least it’s impossible to get good quality with treated bentonites as natural bentonites .Under tough drilling   conditions, (high temperature, presence of bivalent cations, bacterial activity etc.) the treated bentonite can show an unexpected deterioration in quality owing to polymer break down, or incompatibiliy with the mud chemicals or formation materials.This, also causes  excess chemical treatment usage which   means drilling problems and more money.

* Another problem in using  treated bentonite is to exceed the treating rate. Additives are usefull up to a critical point. But after this point they are unwill and may be dangerous.

* In a mud system, if an extended bentonite is used together with a polymer similar to the extender; the optimum consentration will be surpassed resulting a significant reductýon (as happens to KCL/polyacrylamide mud)

*Another problem is unwanted flocculations. Natural bentonite, Sodium montmorillonite, KAR-BEN is so strongly hydrated that does not cause distinct flocculations.Addition of treated bentonite adding to cement cause detrimental increase in viscosity

* If soda ash is used as an extender, soda ash interferes to the  circulatýon water and increases its salinity ratio. This causes a negative effect in making filter cake of the mud

 
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