Well-drilling anti-foaming agent

A well-drilling anti-foaming agent is characterized in that: the agent is composed of in parts by weight: 10-30 parts of poly(sodium silanolate), 50-80 parts of water glass, 5-25 parts of aluminum stearate and 80-120 parts of diesel oil; and the preparation of the agent comprises: mixing poly(sodium silanolate) solution, water glass, aluminium stearate and diesel oil, stirring at 70-85 DEG C for 60-90 min to prepare the product. The well-drilling anti-foaming agent has the advantages of being easily available in raw material, low in cost, green and environment-friendly, convenient to use and good in effect.