Secondary Emulsifier is added to oil-based drilling fluids to help primary emulsifiers build a water-in-oil emulsion to operate better. The HLB value of the secondary emulsifier is higher, allowing it to stabilize the emulsion while simultaneously wetting the solid phase. It's a versatile substance that can be utilized in a variety of oil mud systems. Secondary Emulsifier is a highly stable and effective emulsion and oil wetting agent. It maintains temperature stability while controlling viscosity and filtration. It acts as a secondary wetting agent and increases emulsion stability.