Drilling fluid defoamers change the physical properties of foam by interfering with and destroying the surface tension of the foam, thereby rapidly disintegrating the foam into liquid form. The main components of defoamers usually include surfactants, anti-bubbling agents, and foam disruptors. These ingredients adsorb to the surface of the foam, reducing the surface tension of the foam and causing the foam bubbles to burst and break away from the liquid phase.

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