Lubricant for drilling fluid and preparation method thereof

The invention discloses a lubricant for drilling fluid and a preparation method thereof. The lubricant for drilling fluid is prepared from long-chain fatty acid, light diesel oil and stearate, the long-chain fatty acid is one or a mixture of at least two of oleic acid, palmitic acid and stearic acid in any proportion, the light diesel oil is one or a mixture of at least two of 5 # diesel oil, 0 # diesel oil and-10 # diesel oil in any proportion, and the stearate is one or a mixture of at least two of aluminum stearate, magnesium stearate, calcium stearate and barium stearate in any proportion. The lubricant for the drilling fluid has the advantages of being good in lubricating property, low in fluorescence level, low in foaming rate and good in compatibility with various common drilling fluid additives, the preparation method of the lubricant is simple, the production cost is low, and industrial production is easy. 本发明公开了一种钻井液用润滑剂及其制备方法，由长链脂肪酸、轻质柴油和硬脂酸盐组分制备而成，其中长链脂肪酸为油酸、棕榈酸、硬脂酸中的一种或至少两种以任意比例的混合，轻质柴油为5#柴油、0#柴油