Sodium Bentonites and Lignites/LCM'S
The main functions of Bentonite drilling fluids include providing hydrostatic pressure to prevent formation fluids from entering into the well bore, keeping the drill bit cool and clean during drilling, carrying out drill cuttings and suspending the drill cuttings while drilling is paused and the drilling assembly is brought in and out of the hole.
Leonardite is used to stabilize and thin fluids used in the drilling of wells for hydrocarbon exploration/extraction and geothermal drilling. It has very good temperature stability and prevents solidification of lime muds near 150°C.
Oil-Based Drilling Muds
Organoclay, is recommended as a rheological additive in oil based fluids and drilling muds.