韩城区块煤层气井井下管杆缓蚀剂研制  

Development of Corrosion Inhibitor for Underground Pipe Rod for Coalbed Methane Well in Hancheng Block

作　　者：万里平 晋国栋 肖东 姚金星 WAN Li-ping;JIN Guo-dong;XIAO Dong;YAO Jin-xing(College of Petroleum Engineering,Southwest Petroleum University,State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation,Chengdu 610500,China)

机构地区：[1]西南石油大学石油与天然气工程学院,“油气藏地质及开发工程”国家重点实验室,成都610500

出　　处：《科学技术与工程》2018年第33期41-45,共5页Science Technology and Engineering

基　　金：国家科技重大专项(2011ZX05038-002)资助。

摘　　要：针对韩城区块煤层气井长期存在的井下管杆腐蚀问题,通过对现场采出气、液及腐蚀产物进行分析,判断韩城区块主要腐蚀因素为CO_2、H_2S在高矿化度环境下多组分协同作用。通过腐蚀失重法和电化学方法对缓蚀剂进行了筛选、复配及最佳添加浓度等实验研究,研制出了适合该区块的缓蚀剂。室内实验结果表明,该缓蚀剂在韩城区块腐蚀环境下取得了很好的缓蚀效果,使管材年均腐蚀速率降到0. 045 mm·a^(-1),能经济高效地解决该区块煤层气井下管杆腐蚀问题。In allusion to the long-standing tubing sucker rod corrosion of coalbed methane well in Hancheng block,an analysis of gas production,liquid production and corrosion products produced in the field was maken,a judgment was maken that the corrosion factors in Hancheng block are mainly CO 2,H 2S,and multi component synergy in high salinity environment.Through the corrosion weight loss method and electrochemical method,the corrosion inhibitor was screened,compound and the best addition concentration was studied.The corrosion inhibitor suitable for the block was developed.The results of laboratory experiments show that the corrosion inhibitor has achieved good corrosion inhibition effect under the environment of Hancheng block,and the annual average corrosion rate is reduced to 0.045 mm·a-1.The corrosion problem of the lower pipe rod in the coalbed gas well can be solved economically and efficiently.

关 键 词：煤层气井 井下管杆 CO2/H2S腐蚀 缓蚀剂 

分 类 号：TE983[石油与天然气工程—石油机械设备]