海上油田用清水剂制备及应用研究

Research on water clarifier synthetizing and field application in offshore oilfield

为开发性能优异的二硫代氨基甲酸盐(Dithiocarbamate,DTC)清水剂产品,提升海上油田水处理能力,在室内分别采用有机胺中间体(YF-02)、聚醚胺(T-403)及四乙烯五胺在碱性条件下,用CS_(2)改性得到3种DTC清水剂NQ-101、NQ-102和NQ-103,并对3种DTC清水剂进行了红外光谱表征,在油田现场与在用清水剂Q-30A进行了瓶试对比,同时对性能优异的产品进行了现场中试和常规应用。结果显示,3种DTC清水剂与在用清水剂Q-30A的性能排序为:NQ-101>Q-30A>NQ-103>NQ-102;对NQ-101进行现场中试时,2个旋流气浮处理装置(Compact Flotation Unit,CFU)出口水中含油浓度(OIW)平均值分别由20.1 mg/L和17.5 mg/L降至12.9 mg/L和11.2 mg/L,清水效果明显优于Q-30A的清水效果;在进行油田提产及NQ-101注入点后移时,外排水OIW仍保持在20 mg/L内,满足现场生产要求。对生产流程中各种离子进行检测,验证了DTC清水剂的作用机理;常规应用发现,NQ-101生产流程稳定,现场应用效果良好。通过清水剂合成和现场应用,成功开发出了性能优异的DTC清水剂产品,有效提升了海上石油平台含油污水处理能力。

In order to improve the water treatment capacity in offshore oilfield,a Dithiocarbamate(DTC)water clarifier product with good performance needs to be developed.This research synthetized three DTC water clarifiers as NQ-101,NQ-102 and NQ-103 by modifying YF-02,T-403 and tetraethylenepentamine(TEPA)with CS_(2)in laboratory alkaline condition.The research characterized these three DTC water clarifiers with IR spectroscopy,compared their bottle test results with presently used water clarifier Q-30A in the oil field,and carried out on-site pilot test and routine field application for the product having the best performance.The results show that the performance ranking of all 4 water clarifiers is NQ-101>Q-30A>NQ-103>NQ-102.When implementing on-site pilot test and application of NQ-101,the Oil-in-Water(OIW)discharging from the two Compact Flotation Units(CFU)CFU-A and CFU-B decreased from 20.1 mg/L and 17.5 mg/L to 12.9 mg/L and 11.2 mg/L,clearly showing that NQ-101 has better performance than Q-30A.After increasing field production and moving back injection point of NQ-101,the OIW of overboard discharge is still under 20 mg/L,meeting the requirements of field production.Furthermore,the mechanism of DTC water clarifier actions was proven by detecting every kind of ion.When NQ-101 was routinely applied in the oilfield,the production process is stable and the result is consistently good.This research successfully developed a DTC water clarifier with high performance through synthetizing and field application,which improved oily wastewater treatment capacity in offshore oilfield.