摘要
套管腐蚀严重影响着油田的安全生产和经济效益。针对镇340区块具有腐蚀代表性的油井开展了套管腐蚀机理研究:首先对油井采出水的水样进行分析,结果表明镇340区块的水样矿化度较高并伴有一定含量的CO2,在腐蚀介质中含有CO2的情况下,钢片的腐蚀速率出现了明显的增加,而且腐蚀介质中CO2的含量越高其对金属腐蚀的促进作用越强;再借助电化学测试手段,评价缓蚀剂MH-46在腐蚀介质中对金属的缓蚀效果,结果表明加入缓蚀剂后腐蚀电流密度出现了明显地降低,当缓蚀剂浓度达到10×10^-4mol/L时,对钢片的缓蚀效率达到了98.4%,有效地阻隔了腐蚀性离子与金属基体的接触,降低了金属基体的腐蚀速率,从而延长了使用寿命。
Casing corrosion seriously affects the safety production and economic benefit of oil fields.The study of casing corrosion mechanism was carried out towards the corrosively representative oil wells in block 340.The water sample from the oil wells was first analyzed and the results show that the water sample from block 340 has a high salinity,accompanied by a certain amount of CO 2.In the case of CO 2 in the corrosive medium,the corrosion rate of steel sheet increases obviously,and the higher the content of CO 2 in the corrosive medium,the stronger the promoting effect on metal corrosion.Then,by means of electrochemical measurement,the inhibition effect of corrosion inhibitor MH46 on metal in corrosion medium was evaluated.The results show that the corrosion current density decreases obviously after the addition of corrosion inhibitor.When the concentration of inhibitor reaches 10×10-4 mol/L,the corrosion inhibition efficiency of steel sheet reaches 98.4%,which effectively blocks the contact between corrosive ions and metal matrix,reduces the corrosion rate of metal matrix and thus extends its service life.
作者
王尚卫
魏磊
杨焕英
Wang Shangwei;Wei Lei;Yang Huanying(Research Institute of Oil&Gas Technology,Changqing Oilfield Company,CNPC,National Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields,Xi’an 710018,Shaanxi;Research Institute of Geological Exploration&Development,Chuanqing Drilling Engineering Company Limited,CNPC,Chengdu 610051,Sichuan;Research Institute of Petroleum Exploration and Development,Changqing Oilfield Company,CNPC,National Engineering Laboratory for Exploration and Development of Low Permeability Oil&Gas Fields,Xi’an 710018,Shaanxi)
出处
《长江大学学报（自然科学版）》
CAS
2020年第3期56-60,I0004,I0005,共7页
Journal of Yangtze University(Natural Science Edition)
基金
国家科技重大专项“大型油气田及煤层气开发”(2017ZX05013)。
关键词
腐蚀机理
二氧化碳
腐蚀速率
腐蚀电流密度
缓蚀效率
镇340区
长庆油田
corrosion mechanism
CO 2
corrosion rate
corrosion current density
corrosion inhibition efficiency
block 340
Changqing oilfield
