油酸咪唑啉缓蚀剂对三高气井碳钢110S管材的生产适应性研究  

Production Adaptability of Oleic Acid Imidazoline Corrosion Inhibitor to Gas Well 110S Carbon Steel Under High Temperature,High Pressure,High Acid Conditions

作　　者：张智[1] 吕祎阳 桑鹏飞 侯铎[1] 谢涛 霍宏博 李金蔓 ZANG Zhi;LV Yi-yang;SANG Peng-fei;HOU Duo;XIE Tao;HUO Hong-bo;LI Jin-man(State Key Laboratory of Oil and Gas Reservoir Geology and Development Engineering,Southwest Petroleum University,Chengdu 610500,China;Engineering Technology Research Institute of Petrochina Southwest Oil and Gas Field Copany,Chengdu 610017,China;Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)

机构地区：[1]西南石油大学油气藏地质及开发工程国家重点实验室,四川成都610500 [2]中国石油西南油气田分公司工程技术研究院,四川成都610017 [3]中海石油(中国)有限公司天津分公司,天津300459

出　　处：《材料保护》2021年第4期46-52,共7页Materials Protection

基　　金：油气藏地质及开发工程国家重点实验室西南石油大学资助项目(PLN 201925);国家自然科学基金(52074234);四川省青年科技创新研究团队专项计划(2020JDTD0016)。

摘　　要：三高(高温、高压、高酸性)气井极端恶劣的工况条件使井筒管材腐蚀失效问题凸显,对管柱生产安全及其服役寿命构成了严重危害。为此,研究了油酸咪唑啉缓蚀剂在三高气井H_(2)S/CO_(2)多相流腐蚀环境中对碳钢110S的缓蚀性能及其生产适应性。以西南地区某三高气井碳钢110S为研究对象,运用70 MPa、200℃高温高压釜开展循环流动腐蚀试验模拟三高气井生产时油管内多相流工况环境,进行腐蚀性能评价。使用SEM观察试验后产物膜的形貌变动特征,借助等温吸附模型探讨了缓蚀机理。结果发现:当缓蚀剂浓度在0~1150 mg/L之间时,缓蚀剂浓度为650 mg/L时的缓蚀效率最高。当流速较高时,较大的剪切力会破坏吸附膜,从而降低缓蚀剂性能。在该工况条件下,油酸咪唑啉缓蚀剂在碳钢110S表面的吸附行为符合Langmuir吸附等温式。在井筒流速为1.7 m/s时,650 mg/L浓度下该缓蚀剂在气井非积液层段中表现出优异的缓蚀效果,缓蚀效率可达99%;气井一旦产生积液,建议选取合适的排水采气工艺以降低管柱腐蚀,延长管柱服役寿命。The extremely bad working conditions of three-high(high temperature,high pressure,high acid conditions)gas wells make the corrosion failure of wellbore pipes prominent,which has a serious impact on the production safety and service life of the string.For this,the corrosion inhibition performance and production adaptability of oleic acid imidazoline inhibitor to carbon steel 110 S in H_(2)S/CO_(2) multiphase flow corrosion environment of a three-high gas well were studied.The carbon steel 110 S of a three high gas well in Southwest China was taken as the research object,the 70 MPa,200℃high temperature autoclave was used to simulate the multiphase flow working environment of three-high gas wells during production.The corrosion performance evaluation experiment was carried out.The characteristic changes of corrosion product film were observed by SEM,the mechanism of corrosion inhibition was discussed by isothermal adsorption model.Results showed that when the concentration of inhibitor was set in the range of 0 to 1150 mg/L,the inhibition efficiency of the inhibitor was the highest at the concentration of 650 mg/L.When the flow rate was higher,the larger shear force would destroy the adsorption film,thus reducing the performance of corrosion inhibitor.Under this condition,the adsorption behavior of oleic acid imidazoline inhibitor on carbon steel 110 S surface conformed to Langmuir adsorption isotherm;when the wellbore flow rate was 1.7 m/s,the corrosion inhibitor with 650 mg/L concentration showed excellent corrosion inhibition effect in the non-effusion interval of gas well,and the corrosion inhibition efficiency could reach 99%.Once the gas well has liquid accumulation,it was recommended to select appropriate drainage gas production technology to reduce the corrosion of the pipe string and prolong the service life of the pipe string.

关 键 词：腐蚀 咪唑啉类缓蚀剂 碳钢110S 三高条件 吸附 缓蚀率 

分 类 号：TG174.42[金属学及工艺—金属表面处理]