A anti-freezing water-based nanoemulsion-type lubricant AF-Lube was produced with polyols aqueous solution, vegetable oil and compounded emulsifiers (monoolein and polyglyceryl-10 momooleate) by phase inversion composition method. The optimal experi-mental conditions are the mass fraction of polyols aqueous solution was 30 ％～60 ％, the mass fraction of vegetable oil was 35％～60％, the HLB of compounded emulsifiers was 11～12. The freezing point of AF-Lube is below -30 ℃ and the stability of nanoemulsion is good. AF-Lube 30 kg/m3 could reduce the torque value for both fresh water and sea water based bentonite by more than 80 ％. The performance of AF-Lube was further evaluated by PEM and PEC drilling fluid systems used in offshore oilfields. The results showed that the lubrication factor for test systems were reduced from 0.24～0.26 to 0.13～0.16 and the mud rheologies were impacted little.%选用植物油酯为内相,多元醇水溶液为外相,单油酸甘油酯和十聚甘油单油酸酯为复合乳化剂,通过相转变组分法制备了一种水基纳米乳液润滑剂AF-Lube.通过室内实验研究确定了多元醇水溶液质量分数为30％～60％,植物油酯质量分数为35％～60％,复合乳化剂HLB值为11～12.所制备的水基纳米乳液润滑剂AF-Lube凝固点低于-30℃且稳定性良好.在加入30 kg/m3AF-Lube后,淡水基浆和模拟海水基浆扭矩均降低80％以上.在海上油田使用的PEM和PEC钻井液中加入30 kg/m3AF-Lube后,润滑系数由0.24～0.26降至0.13～0.16且加入AF-Lube对PEM和PEC钻井液流变性能影响不大.
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