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目的 通过化学防腐技术,解决油田生产中高温油井腐蚀结垢影响油田正常生产的难题. 方法 进行挂片失重实验和容量分析实验,开展现场水质分析和垢样分析,通过正交实验研究不同种类缓蚀阻垢剂在不同添加量、不同温度下对缓蚀效率、阻垢效率的影响. 结果 在明确油井腐蚀结垢原因的基础上,有针对性地研制出了以咪唑啉衍生物和有机膦酸盐等为主,以耐高温的氟碳咪唑啉为辅的HZG系列缓蚀阻垢剂. 其缓蚀阻垢效果较好,缓蚀率达90%以上,阻垢率达95%以上,有效缓解了高温油藏(大于100 ℃)油井井筒腐蚀、结垢的问题. 经10口井现场应用,铁离子下降率平均达到82%,钙离子浓度明显上升,平均检泵周期延长了2 . 2倍. 结论 氟碳咪唑啉的加入有效提高了缓蚀阻垢剂的耐温性. HZG系列缓蚀阻垢剂用于现场的缓蚀阻垢效果较好,解决了高温油井腐蚀结垢的难题.

Objective To solve the problem of corrosion and scaling affecting the normal production in the high temperature oil well during the oilfield production by chemical corrosion technology. Methods The weight loss test and the capacity analysis experi-ment were carried out and the on-site analyses of water quality and scale samples were performed. The effects of different kinds of corrosion and scale inhibitors on the corrosion efficiency and scale efficiency were studied by orthogonal test at different additive a-mounts and different temperatures. Results Based on clarifying the causes of the corrosion and scaling of oil well, the HZG series of corrosion and scale inhibitors were developed composed of imidazoline derivatives and organic phosphonic acid salt with supple-ment of high temperature-resistant fluorocarbon imidazoline. The inhibition effect on scale and corrosion was great, the corrosion in-hibition rate was above 90% and the scaling inhibition rate was above 95%, effectively alleviating the corrosion and scaling prob-lem of well bore under the high temperature oil reservoir ( greater than 100℃) , and the on-site applications achieved good effects in the testing of 10 wells, the average decreased rate of calcium ions reached 82%, the calcium ion concentration was also in-creased significantly, the average pump detection period extended 2. 2 times. Conclusion Addition of components of fluorocarbon Imidazoline could effectively improve the heat resistance of corrosion and scale inhibitors. On-site usage of HZG series of corrosion and scale inhibitors obtained great inhibition effect on corrosion and scale, and solved the corrosion and scale problems of the high temperature oil well.