Bentonite API-11 (OCMA) is high grade sodium bentonite specially selected and its characteristics meet API SPEC 13A Section 11 (Eighteenth Edition Aug 2010) specifications. The purity of its basic mineral and its high Montmorillonite content give a good stability to all the drilling fluids produced with Bentonite API-11. The product is particularly designed for water and oil drilling.
Properties of Bentonite API-11 (Bentonite)
Viscometer dial reading at 600 rpm
Yield Point / Plastic Viscosity Ratio
Max. 16 Cm3
Residue greater than 75 µm (200 Mesh)
Application : –
Bentonite API-11 (OCMA) is used for providing viscosity in fresh water mud systems in oil well drilling.
Bentonite API-11 (OCMA) reduces fluid loss and water seepage into permeable formations.
Bentonite API-11 (OCMA) is a cost effective means of achieving viscosity, fluid loss control and filter-cake quality in freshwater and seawater muds.
As with all bentonite products, the yield decreases as the salinity increases. In drilling muds containing more than 5000 mg/L chlorides, the performance of bentonite (API-11) is significantly reduced unless it is pre-hydrated in fresh water, before adding it to the mud system.