Fluorescence-free lubricant for petroleum drilling fluid and preparation method of fluorescence-free lubricant

The invention discloses a non-fluorescent lubricant for a petroleum drilling fluid and a preparation method of the non-fluorescent lubricant. The non-fluorescent lubricant comprises the following components in parts by mass: 85-90 parts of vegetable oil, 5-10 parts of modified graphite, 1-2 parts of sodium hydroxide, 1-2 parts of an extreme pressure lubricant, 0.5-1 part of span 80 and 0.5-1 part of a defoaming agent. The lubricant prepared in the invention has the advantages of good lubrication effect, difficult precipitation, no fluorescence, no pollution, no toxicity, no negative influence on geological logging, and no influence on the discovery of a new hydrocarbon reservoir. 本发明公开了一种石油钻井液用无荧光润滑剂及其制备方法，按照质量份数计包括如下组分：植物油85-90份、改性石墨5-10份、氢氧化纳1-2份、极压润滑剂1-2份、司盘80 0.5-1份、消泡剂0.5-1份。本发明制备出的润滑剂不仅润滑效果好，不易出现沉淀，而且无荧光、无污染、无毒，对地质录井无负面影响，不会影响发现新油气层。