(1) Drilling: ethyl silicone oil (or methyl silicone oil layer emulsion) is used as a mud additive. (2) Oil recovery: oil and gas separation, defoaming rod. The melting point is 2.8¬13.9℃ higher than the wellhead foam temperature. (3) Natural gasoline absorption: Use gasoline to mix dimethyl silicone oil into 2% solution. (4) Oil and gas separation and demulsification: A, oil and gas separation, adding 0.025 ~ 0.0065mg/Kg of crude oil can improve production capacity; B, demulsification: oil and gas separation of crude oil is generally micro W/O emulsion, adding about 0.2mg/Kg of appropriate defoamer, can achieve the effect of demulsification and defoamer. (5) Refining: vacuum distillation adds defoamer, the color of the fraction is improved, the range of the fraction is relaxed, and the diesel solution with silicone oil is commonly used. (6) High energy fuel (internal combustion, jet fuel, aviation fuel) with cyanide alkyl polysiloxane dispersed in high flash point kerosene, and then added to the high energy fuel as a high efficiency defoaming agent. (7) Asphalt and residual oil: the amount of silicone oil added is 0.2×10-6 ~ 2.0×10-6 (8) Delayed coking, coke removal, scale elimination: reference amount of defoamer addition: 0.05 ~ 100×10-6 (9) Defoamating drilling fluid: high viscosity sulfonate metal salt (petroleum calcium sulfonate: sulfonated asphalt sodium = 1:1), the amount of siloxane added about 100 ~ 400×10-6 or 5 ~ 15mg/Kg, sulfonate: siloxane close to 1:1 is better. (10) Lubricating oil: such as internal combustion engines, automotive lubricants, metal working fluids, compressor oil, etc., when silicone oil is added for defoaming, it is because of the following advantages: A, insoluble in lubricating oil, in a dispersed state, is conducive to adsorption on the bubble film bubble breaking; B, there are similar to mineral oil alkyl, can squeeze into the bubble film, weaken the molecular gravity; C, low surface tension, good penetration, adsorption on the surface of the bubble film to reduce the local surface tension, due to the surface tension of the bubble film is not uniform and burst. Heavy oil is selected with small viscosity silicone oil, and the addition amount is 1 ~ 10×10-6. In addition, alkyl polyacrylates are also better and have better gas release. Branched chain amine added to crude gasoline, naphtha, and then added to the lubricating oil, can also be used as a defoamer, adding a small amount of 0.05 ~ 1%, this defoamer can be added to the metal cutting fluid.

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