Lignite Supplier and Manufacturer

LIGNITE

Lignite is a naturally occurring material used to reduce fluid loss and deflocculate water base muds. lignite is a partially soluble additive which provides thin, low permeability filter cakes. It is an excellent emulsifier for oil in water emulsions as well as a secondary deflocculant and is especially effective in high‐temperature applications. It performs exceptionally well in dispersed systems as a synergistic additive with lignosulfonates. It can be used in virtually any water‐base fluid.

CHARACTERISTICS AND PROPERTY

(1).    Physical State : The material shall be in the form of powder, free from lumps and visible impurities.
(2). Physical appearance.......................................................................Black powder. 
(3). Specific Gravity...............................................................................1.6 - 1.8(S.G).
(4). pH (1% solution)..............................................................................4 - 5(PH Scale). 
(5). Bulk Density...................................................................................52 lb/ft3 (833 kg/m3)
(6). Typical Grind..................................................................................90 - 95 % <20 mesh. 
(7).    Moisture Content at 105 ± 2 °C percent by mass :..............................12.0 (Maximum). 

(8).    Dry Screen Analysis :
Fraction Passing through 72 Mesh BSS or Equivalent Sieve, percent by mass :.............95 (minimum).
(9). Performance Test : 
(a) Preparation of Sodium Lignite Solution :

Take 50 g of 72 Mesh (BSS or equivalent) Powdered Lignite (on dry basis) and dissolve in 350 ml of Distilled Water containing 10 g of Caustic Soda (AR/GR grade) with the help of Hamilton Beach Mixer, stirring at high speed for 30 minutes. Transfer it to 500 mtvolumetric flask. Age this Solution for 24 hours at 24 ± 2°CC and make the volume to 500    ml. Mix the Solution thoroughly to make it homogenous before use.

(b) Preparation of Base Mud :

Prepare a Bentonite Suspension containing a maximum of 7.5 g VISION approved Bentonite per 100 m/ Distilled Water by stirrer with laboratory stirrer (3000- 4000    rpm) for 15 minutes. Age it for 24 hours at 24 ± 2°CC and load it to 1.50 - 1.53 Specific Gravity with Barytes. This Mud should have the following parameters at 24 ±2 °C :
(i)    Apparent Viscosity ( cP) : 40 ± 5.
ii)    Gel10 ( lbs / 100 sq. ft ) : To be determined.
(iii) API Filtration Loss (    ml / 30 minutes ) : To be determined.
(c) To 1-litre (1000 ml) of above Base Mud 4(b), add 200 ml of thoroughly mixed Solution of Sodium Lignite 4(a) with stirring. Stir it for 15 minutes with Hamilton Beach Mixer at high speed. Finally reload the Mud up to 1.50 - 1.53 Specific Gravity. Adjust the pH of this Mud to 9.0 -9.5. This Mud should have the following properties at 24 ± 2°C :
(i)    Apparent Viscosity (cP) : 30 (Maximum).
(ii) Gel 10 ( lbs / 100 sq. ft ) : Should not be more than half the value obtained for base mud 4 (b) (ii).
(iii)    API Filtration Loss ( ml/ 30 minutes ) : 10 (Maximum).

APPLICATIONS


Lignite additive can be used for rheology and filtration control in all water‐base muds. It is especially effective in stabilizing the properties of muds exposed to high temperatures and contaminants such as CO2 andcalcium. Lignite additive is especially effective when treating cement contamination. It reduces the high viscosity and pH of cement‐contaminated muds and reacts with calcium to lessen the contaminating effects. 

Normal treatments of lignite range from 1 to 8 lb/bbl (2.85 to 22.8 kg/m3). Due to their low pH, lignite treatments require additional caustic soda or an alternative alkaline material, to maintain a consistent pH. A normal ratio is one sack of caustic soda for every four sacks of lignite. In high salinity systems, it is preferable to premix the lignite in medium‐pH freshwater to enhance dispersibility then add the premix to the active system. It is most effective in mud systems with an alkaline pH in the range of 9 to 11.


 ADVANTAGES

Provides improved filtration control.
Reduces viscosity and gel strengths.
Significantly extends the temperature stability of water‐base fluids.
Resists the effects of contamination.
Improves filtercake quality by reducing its thickness and permeability.
Reduces wall-sticking tendencies.
Stabilizes rheological properties.
Compatible with a wide range of water base systems.
Especially effective when treating cement contamination.


LIMITATIONS


Less effective at pH levels below 9.5. 


TOXICITY AND HANDLING

Bioassay information is available upon request. Handle as an industrial chemical, wearing protective equipment and observing the precautions as described on the Transportation and Material Safety Data Sheet (MSDS).

PACKING AND STORAGES
Lignite is packaged in 50-lb (22.7-kg), multi-wall, paper sacks. Store in a dry, well ventilated area. Keep container closed. Store away from incompatibles. Follow safe warehousing practices regarding palletizing, banding, shrink wrapping and/or stacking.

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