Why is it that water is not used during drilling as a coolant?

Water is not typically used as a coolant during drilling because it can cause several issues.

1. Corrosion: Water can cause corrosion of the drilling equipment and tools, leading to damage and reduced lifespan of the equipment.

2. Formation damage: Water can interact with the formation being drilled, causing swelling or other changes that can hinder the drilling process.

3. Contamination: Water can introduce contaminants into the drilling process, affecting the quality of the drilling fluid and potentially causing problems with the wellbore.

Instead, drilling fluids are used as coolants during drilling operations. These fluids are specifically designed to provide lubrication, cooling, and other necessary functions without the negative effects associated with water.

This is not correct. Water is commonly used as a coolant during drilling, especially in applications with high heat generation. It helps to keep the drill bit and the workpiece cool, preventing overheating and extending the tool life.