Bentonite is mainly used as a drilling mud & part oil-well cement formation.
The best type of bentonite is obtained via bentonite that has high sodium montmorillonite. If a bentonite does not have a high sodium montmorillonite, the filter cake permeability, viscosity build-up will be adversely affected especially when bentonite is used a drilling fluid.
A bentonite with the required specification for the oil & gas industry will be able to provide
- Lightweight cementing system
- Good fluid loss control
- Good rheological properties
- Adequate compressive strengths
- High Plasticity
- Absorb large amount of Water
Bentonite, when mixed with water, forms a fluid that is pumped through the drill stem, and out through the drill bit. It then extracts the drill cuttings from around the bit, which are then floated to the surface.
The drilling mud, or gel also serves too cool and lubricate the drill bit as well as seal the drill hole against sea page and to prevent wall cave-ins.