Introduction
In the initial stage of filtration loss of oil-based drilling fluids, fine particles bridge and plug in the wellbore to form a thin mud cake. Subsequently, emulsion droplets deform under the pressure difference to seal the pores between solid particles. Finally, colloids such as filtration loss reducers-notably the Organophilic Lignite Filtration Control additive-dissolved in the oil-based drilling fluids fill the areas between solids and emulsion droplets. The combined action of these three aspects achieves the effect of reducing filtration loss. Therefore, as an oil-soluble humic acid filtration loss reducer, this Organophilic Lignite Filtration Control agent forms a bridge plug through adsorption and cross-linking interaction with clay particles during the instantaneous filtration loss of the drilling fluid. Meanwhile, the lipophilic humic acid colloid will form an oil film on the surface of the mud cake. The oil film forms a liquid resistance effect on the surface of the mud cake, preventing the filtration loss of oil. For modified humic acid particles with the same lipophilic ability, the smaller the particle size, the larger the proportion of the space occupied by the formed oil film, the narrower the actual passage of the filtrate, the greater the resistance, and the lower the permeability of the formed mud cake. Tests have proved that the minimum permeability of the oil-based drilling mud cake can only be obtained when there is an excessive amount of wide and narrow particle sizes in a certain proportion, and it cannot be obtained when the sizes are in a linear relationship. Therefore, the uniform grading of the modified humic acid particle size is particularly important for the Organophilic Lignite Filtration Control performance in oil-based drilling fluids.
Applications
Effective filtration control alternative to asphalt and gilsonite products.
Promotes stability of invert emulsion fluids.
Advantages
Helps increase thermal stability of drilling fluids at temperatures up to 350°F.
Effective in all oil and invert emulsion systems.
Disperses easily when added through a hopper.
Compatible with other additives.
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