破乳耦合减压蒸馏工艺处理非水基钻井液的资源化及节能降耗特性

Resource recovery and energy-saving characteristics of non-aqueous drilling fluid treatment by demulsification coupled with vacuum distillation process

本文提出了一种破乳耦合减压蒸馏工艺,用于处理多次使用后的非水基钻井液,以实现其资源化,探究了该工艺对非水基钻井液的处理效果及系统能耗,并分析了其破乳协同降耗特性。结果表明:多种破乳剂中,丙二醇嵌段聚醚类破乳剂BASF-L64的热稳定性和降黏效果最佳,在最优添加量1.0%(以钻井液质量计)条件下,液相回收率高达93.51%,剩余固体含油率低于1%,满足《海洋石油勘探开发污染物排放浓度限值》(GB 4914—2008)要求,可达标排放,系统能耗降低9.86%;回收油的烃组分碳数分布与白油基本一致,主要集中于C_(13)~C_(14),可进行钻井液的回配;添加BASF-L64后,体系油水界面张力下降,剩余固体亲油性降低,导致系统能耗和剩余固体含油率下降。

Non-aqueous drilling fluid after multiple uses was treated by employing a demulsification coupled with a vacuum distillation process to achieve resource recovery.The treatment effect of the process on the non-aqueous drilling fluid and the system’s energy consumption were investigated,and the synergistic consumption reduction characteristics of demulsification were analyzed.The results show that among multiple demulsifiers,the propylene glycol block copolymer demulsifier BASF-L64 exhibits the best thermal stability and viscosity reduction effect.Under the optimal dosage of 1.0%(by drilling fluid mass),the recovery rate of the liquid phase reaches 93.51%,and the oil content in the remaining solid is below 1%,which meets the requirements of GB 4914—2008.Additionally,the discharge standard was satisfied,with the system’s energy consumption reduced by 9.86%.The hydrocarbon component distribution of the recovered oil is similar to that of white oil,mainly concentrating in C_(13)-C_(14),making it suitable for conducting the drilling fluid remixing.After the addition of BASF-L64,the decreased oil-water interfacial tension,and oleophilicity of the remaining solid result in lower energy consumption of the system and oil content in the remaining solid.