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Bentonite

1.DESCRIPTION

Bentonite is a ground clay consisting of hydratable minaral Montmorillonite.

2.APPLICATION

Bentonite is used as a effective viscosifier and fluid loss reducing agent.It is most effective in fresh water but can be used in sea water or salt brines if it is prehydrated.

Bentonite may be protected contamination by the addition of thiners or dispersants. The compounds also minimise the high temperature gellation tendency shown by bentonitic drilling fluids.

Due to the flat platelike shape and small size of its particles, bentonites form a high level of lubricity, thus reducing the torque on the drill string.

3.PHYSICAL AND CHEMICAL PROPERTIES

Appearance : Ligh yellow powder

PH : > 7

Solubility : Soluble in water

Toxicity : Non-toxic

Bulk density : 800-950 kg/m3(50-60lbs/ft3)

4.RECOMMENDED TREATMENT

Bentonite is used as required to obtain the desired properties of drilling fluid. When drlling through different zones and sections.

5.AVALUATION AS PER API-SPECIFICATION

SPECIFICATION

REQUIRED

OBTAINED

(Thuan Phong)

Viscometer dial reading at 600 RPM

Yield Point/Plastic Viscosity Ratio

Filtrate Valume

Residue greater than 75 micrometer

Moisture

30 min

3 max

15 ml max

4.0 wt% max

10.0 wt% max

34

2.7

13.5

1.45 %

9.80

6.PACKAGING.

Bentonite is packaged in net 50 kg/sack or as required.

 
 
 
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