环境友好型水基润滑剂GreenLube的研制与应用

Development and Application of Environment-Friendly Water-Based Lubricant — GreenLube

夏小春 胡进军 孙 强 郝彬彬 项 涛

XIA Xiao-Chun HU Jin-Jun SUN Qiang Hao Bin-Bin XIANG Tao

以植物油酯作内相、多元醇水溶液作外相、失水山梨醇三油酸酯/聚氧乙烯失水山梨醇单油酸酯复合表面活性剂为乳化剂，制备了一种水包油型钻井液用润滑剂GreenLube。多元醇水溶液质量分数50%~80%，植物油酯质量分数33%，复合乳化剂最佳HLB值6~7。其BOD5/COD值为0.95，96 h LC50值为35981 mg/L，是一种易生物降解、无毒的水基润滑剂。GreenLube加量为30 kg/m3时，淡水基浆扭矩降低69%，模拟海水基浆扭矩降低47%。在海上油田使用的JFC、PEM和PEC钻井液中加入30 kg/m3 GreenLube，可使钻井液润滑系数由0.24~0.26降至0.14~0.16，且加入前后钻井液的流变性变化较小。GreenLube已在渤海油田数口井的钻探中得到应用，效果良好，泥饼摩擦系数和钻具的扭矩显著降低。

A water-based drilling fluid, GreenLube, was produced through O/W emulsion with 33% vegetable oil, 50%~80% polyols aqueous solution and compounded surfactant (sorbitan trioleate and polyoxyethylenesorbitan monooleate, HLB=6~7). GreenLube was a readily biodegradable and low toxicity material with 0.95 BOD5/COD and 35981 mg/L 96 h LC50. Compared with based slurry, GreenLube (30 kg/m3) could reduce the torque value for fresh water and sea water based bentonite by 69% and 47%, respectively. The properties of GreenLube were further evaluated by JFC, PEM and PEC drilling fluid systems currently used in offshore oilfield. The results showed that the lubrication factor for test systems were reduced from 0.24—0.26 to 0.14—0.16 without influence of the mud rheologies. GreenLube had been successfully used in several wells of Bohai oilfield. The friction coefficient of mud cake and torque of drilling tool were notably reduced.