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注水开发是保持油田高产稳产的有效措施之一,注水井用的油管因长期浸于水中且受到温度、压力及酸、碱、盐等介质的影响,使油管受到严重腐蚀。从胜利油田未经防腐处理的注水井油管使用情况来看,一至二年就有腐蚀穿孔现象。油管被腐蚀破坏不仅耗掉大量管材,而且腐蚀物进入地层后成为胶泥状的氢氧化铁,降低了油层的渗透率,给油井后期生产造成困难。近几年来国内各油田在注水井采用偏心活动配水器新工艺,常常出现腐蚀物堵塞配水器水嘴和埋设打捞头的问题,更需对注水井的油管进行防腐蚀处理。涂料油管就是在油管内外壁涂上涂层,起到防腐蚀作用。本文试对涂料油管的生产原理、工艺流程和主要设备作以全面介绍,希望能起到抛砖引玉的作用。
Water injection development is one of the effective measures to maintain high and stable production in oilfield. Tubes for injection wells are severely eroded due to the long-term immersion in water and the influence of temperature, pressure, acid, alkali and salt. From Shengli Oilfield uncorrolated injection well tubing use case, one to two years there is corrosion perforation. Corrosion of the tubing is not only consumed a lot of pipe corrosion, and corrosion into the formation of clay after the iron hydroxide, reducing the permeability of the reservoir, resulting in difficulties in the late production wells. In recent years, all oilfields in China have used eccentric water dispensers in water injection wells. Corrosion often clogs the spout of the water distributor and buries the fishing head. In addition, the tubing of the water injection well needs anti-corrosion treatment. Coating tubing is painted on the inner and outer tubing coating, play a role in anti-corrosion. This paper tries to make a comprehensive introduction to the production principle, process flow and main equipment of paint tubing, hoping to play a valuable role.