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Home > Products > Oil well drilling fluid & Mud > Mica Flakes

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Mica Flakes


MICA FLAKES have been preferably used in water-based and oil based oil-well drillings operations as an additive mud chemical to prevent loss of circulation and seepage. Mica is specially added to seal-off the lost circulation zones. The platy structure of mica facilitates the overlapping of particles to form a layer or wall and acts as a sealent that bridges the openings. The use of mica helps to seal porous formations and contributes to regain circulation keeping the solids in suspension.

The technique adopted is to mix quantities of mica flakes and granular bentonite into special batches of mud which is pumped down the hole. The drill pipe is then withdrawn and the hole left undisturbed for a time being. Mica flakes tends to plate out on the walls at the lost zones and reduce the size of the holes through which the mud can pass. After a short interval, the plug is strong enough to permit circulation to resume without loss. Drilling then proceeds normally until a depth well below the lost circulation zone.

What is Mica and Mica Flake?
Mica is a non-toxic silicate mineral that has been used for centuries. Most mined mica is in blue and green colors, but iron oxides and other additives are used to make it different in color. Heat-treating is sometimes used to increase the metallic appearance of mica. Mica Flakes is mica slices ground into sizes ranging from 0.5 Millimeter to 7 Millimeter. This material is prepared mainly by the means of rotary hammer crushing machine in which the mica is literally beaten till some time that the required size is not achieved and the material passes out from graded sieves. When ground into a powder, mica displays a translucent shine that has made it a favored ingredient in cosmetics since ancient times. Its ability to reflect light means that it is used in small amounts for items such as face powders and highlighters. It’s used in larger quantities in lipstick and eye shadow, where it’s a key coloring ingredient. Mica powders are one of the foundational ingredients in most mineral makeup.

“Micro-Silica usage in cement”
Micro-Silica is very high in fineness and in silica content, and a very effective pozzolanic material depending on free lime content of cement use. On the other hands, it is known as a reducer of the permeability of concrete and increaser of the concrete strength and durability. On the negative side, it effects color, water demand. Because of its extreme fineness, micro silica presents handling problems, slump loss, stops bleeding of concrete. The dosage rate depending on what you are trying to achieve, typically around 5-15% of by weight of cement.

Coarse Mica Flakes

Suitably used for sealing openings. Apparent density = 0.17kg/ltr. Particle Size : Max 10% retained on 9.50mm B.S.Sieve. Material retained on Sieve 4.75mm + material passed through 1.70 mm = 30-40% Max.

Medium Mica Flakes

Generally used to combate mild circulation in porous formations. Apparent density=0.18 kg/ltr. Particle size: Max 10 % retained on 3.35 mm B.S.Sieve. Material retained on 1.70 mm + material passed through Sieve 0.425 mm = 30-40% Max.

Fine Mica Flakes

Suitable for use when a sealing agent is needed to be small enough to pass through a shaker screen without interfering with the operations. Apparent density=0.20 kg/ltr. Particle size : Nil retained on 0.850 mm B.S.Sieve. Matertial retained on Sieve 0.425 mm + material passed through sieve 0.15 mm = 30-40% Max.