侏罗系油藏油井用固体缓蚀剂适用性研究  

Applicability Study on a Solid Corrosion Inhibitor in Oil Well of Jurassic Reservoirs

作　　者：吕祥鸿[1] 谢登峰 徐建国[2] 张鑫鑫 王晨辉 王晨 LYU Xianghong;XIE Dengfeng;XU Jianguo;ZHANG Xinxin;WANG Chenhui;WANG Chen(Xi'an Shiyou University,School of Material Science and Engineering,Xi'an 710065,China;No.2 Oil Production Plant,PetroChina Changqing Oilfield,Qingyang 745100,Gansu,China)

机构地区：[1]西安石油大学材料科学与工程学院,西安710065 [2]中国石油长庆油田第二采油厂,甘肃庆阳745100

出　　处：《焊管》2024年第3期35-40,共6页Welded Pipe and Tube

基　　金：国家自然科学基金青年科学基金项目“W/B4C纳米多层涂层的界面结构和强韧化机理研究”(项目编号51902254);陕西省自然科学基础研究计划“Al掺杂FeMn/TiN纳米涂层的相变行为和强韧化机理研究”(项目编号2018JQ5108)。

摘　　要：依据相关标准及模拟工况的腐蚀速率和电化学性能测试,对固体缓蚀剂的理化性能、缓蚀效果和缓蚀作用机理进行评价分析,探讨固体缓蚀剂在长庆油田侏罗系油藏开发过程中的适用性。研究结果表明,固体缓蚀剂具有良好的理化性能,在现场水介质中溶解性良好,并且无乳化倾向,但大量油相的存在会降低固体缓蚀剂的长期有效性;添加固体缓蚀剂后,在较短释放周期内,J55钢的均匀腐蚀速率明显下降,缓蚀效率高达85.64%;固体缓蚀剂长时间释放后,缓蚀作用明显减弱,其释放60 d后的缓蚀效率仅为7.37%;综合固体缓蚀剂均匀和局部腐蚀缓蚀性能以及释放率的测试结果,其投加周期不应超过60 d;固体缓蚀剂的电化学作用机理主要表现为阴极阻滞型缓蚀,但当固体缓蚀剂长时间释放后,J55钢的阳极过程明显活化,缓蚀剂吸附膜阻急剧减小,固体缓蚀剂的缓蚀效果显著降低。Based on relevant standards and corrosion rate and electrochemical performance test in simulated working conditions,the physical and chemical properties,inhibition performance as well as function mechanism were evaluated and analyzed,and the applicability of solid corrosion inhibitor in the development of Jurassic reservoirs in Changqing Oilfield was studied.The results show that the solid corrosion inhibitor possesses good physical and chemical properties and good solubility in on-site water medium,and no tendency to emulsification.However,the existence of a large amount of oil phase will reduce the long-term effectiveness of solid corrosion inhibitor.After adding the solid corrosion inhibitor,the uniform corrosion rate of J55 steel decreases significantly in a short release period,and the inhibition efficiency can reach 85.64%.After the solid corrosion inhibitor releases for a long time,the corrosion inhibition is obviously weakened,and the inhibition efficiency is only 7.37%after 60 days.Based on the test results of uniform and local corrosion inhibition performance and release rate,the dosing period of solid corrosion inhibitor shall not exceed 60 days.The electrochemical function mechanism of the solid corrosion inhibitor is mainly cathodic reaction inhibition.When the solid corrosion inhibitor releases for a long time,the anodic reaction of J55 steel will to be activated obviously and the resistance of the inhibitor adsorption film decreases sharply,and the inhibition effect of solid corrosion inhibitor reduces significantly.

关 键 词：固体缓蚀剂 侏罗系油藏 理化性能 缓蚀作用机理 

分 类 号：TG174[金属学及工艺—金属表面处理]