Bentonit, Alüminyum ve magnezyumca zengin volkanik kül , tüf ve lavların kimyasal ayrışması ile veya bozulmasıyla oluşmuş çok küçük kristallere sahip kıl minerallerinden ( başlıca montmorillonit ) oluşan ve ağırlıklı olarak kolloidal silis yapıda, yumuşak, gözenekli ve kolayca şekil verilebilir açık bir kayadır
A highly plastic clay originating in the decomposition of volcanic ash Up to 2% can be added to all bodies to improve plasticity Up to 3% can be added to glazes and engobes to help keep them in suspension It is best to add the bentonite to the water and mix thoroughly before adding it to the batch
A relatively soft rock formed by chemical alteration of glassy, high silica content volcanic ash This material shows extensive swelling in water and has a high specific surface area The principal mineral constituent is clay size smectite
Absorbent aluminum silicate clay formed from volcanic ash When thoroughly mixed with water, bentonite breaks down into small particles called platelets The platelets plaster, or shingle, cover the wall of the borehole and form a filter cake that cuts off the flow of water from the drilled hole into the surrounding formation BIT SUB The component that connects the bit to the component immediately above BOX END The half of a threaded connections having internal (female) threads CROSSOVER SUB A short component with different threads on either end, used to convert sections of the drill stem from one threaded connection to another
A colloidal clay, composed of montmorillonite, which swells when wet Because of its gel-forming properties, bentonite is a major component of drilling muds See gel and mud
Commercially processed clay used for drilling; bentonite forms naturally from decomposition of volcanic ash, consists of aggregates of flat platelets, and contains sodium montmorillonite, which is important in building viscosity
An aluminosilicate clay formed from volcanic ash decomposition and largely composed of montmorillonite Used as a thickening agent in former PQ quaternary ammonium silicate products
highly plastic clay consisting of the minerals montmorillonite and beidellite that swells when wet and is often used as a lining material to seal landfills and lagoons
A collodial clay (hydrated aluminium silicate that has the property of forming viscous suspensions (gels) with water) that is used as a carrier in pesticide dusts to increase their adhesive properties
a clay, formed from decomposed volcanic ash, with a high content of the mineral montmorillonite; has the capacity of absorbing a considerable amount of water, and swells accordingly
A sodium hydrous aluminum silicate clay mineral (montmorillonit) commercially available in powered, granular or pellet form which is mixed with potable water and used for a variety of purposes including the stabilization pf borehole walls during drilling, the control of potential or existing high fluid pressures encountered during drilling below a water table, and to provide a seal in the annular space between the well casing and the borehole well