👉 The well fluid, also known as drilling mud, is a complex mixture used in the oil and gas industry to facilitate drilling operations. It serves multiple critical functions: it lubricates the drill bit, removes cuttings from the wellbore, maintains wellbore stability, and provides cooling and chemical protection to the drill string. Composed of water, sand, polymers, and various chemicals, well fluid helps prevent corrosion, control pressure, and ensure the safety and efficiency of the drilling process.