摘要
目的减少注水井管柱结垢腐蚀现象的发生,解决常用的水质评价方法存在测量困难、人为经验影响大等问题,提出一套以抑制注水管柱发生结垢腐蚀为目标的注水井水源选择方法。方法基于渤海油田7个水样分析结果,以水质的结垢腐蚀趋势为参考序列,水质成分(HCO3^–、Cl^–、Ca^2+、Na^++K^+、Mg^2+、SO4^2–的离子浓度)为比较序列,通过灰色关联度的方法研究各个离子成分对结垢腐蚀现象的敏感性。在此基础上,利用模糊物元的方法,对注水井水源选择的方法进行研究。结果得到了渤海油田水质成分(HCO3^–、Cl^–、Ca^2+、Na^++K^+、Mg^2+、SO4^2–)对注水管柱结垢的最优影响权重(0.1964、0.1785、0.1753、0.1748、0.1706、0.1044),在此基础上,形成了一套注水井水源的快速选择方法。利用该方法对渤海A油田某注水井的三个水源(1号、2号和3号水源)的水质进行了分析,计算得到的水源优劣排序为2号水源>1号水源>3号水源,通过SI指数测定实验和挂片腐蚀实验验证了该选择方法的准确性。结论该方法可应用于未来渤海油田注水井水质的选择,对减少注水管柱发生结垢腐蚀现象具有较好的指导意义。
The work aims to propose a set of water source selection methods for water injection well aiming at inhibiting scaling and corrosion of pipe string, in order to reduce the occurrence of scaling and corrosion and solve the problems in the commonly used evaluation methods for water quality, such as difficulty in measurement and great influence of human experience. Based on analysis results of seven water samples in Bohai oilfield, the sensitivity of each ion component to scaling corrosion phenomenon was studied by grey correlation degree with the scaling and corrosion trend of water quality as reference sequence and the ion concentration of water quality components(HCO3^–, Cl^–, Ca^2+, Na^+, K^+, Mg^2+, SO4^2–) as comparison sequence. Based of this, the method of water source selection for water injection wells was studied by means of fuzzy matter element method. The optimal influence weights(0.1964, 0.1785, 0.1753, 0.1748, 0.1706, 0.1044) of water quality components(HCO^3–, Cl^–, Ca^2+, Na^+, K^+, Mg^2+, SO4^2–) on scaling of water injection string were obtained. On this basis, a set of rapid selection method of water sources for water injection wells was formed, and the water quality of three water sources(No.1, No.2 and No.3) of a water injection well in Bohai A oilfield was analyzed by this method. The ranking of the water sources was "No.2 > No.1 > No.3" after calculation. Through SI index measurement experiment and scraper corrosion test, the accuracy of the selection method was verified. This method can be applied to water quality selection of injection wells in Bohai oilfield in the future, and has a good guiding significance for reducing scaling and corrosion of injection pipe string.
作者
张启龙
许杰
高斌
李进
龚宁
ZHANG Qi-long;XU Jie;GAO Bin;LI Jin;GONG Ning(State Key Laboratory of Offshore Oil Exploitation,Tianjin Branch of CNOOC Ltd.,Tianjin 300459,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2019年第11期290-296,311,共8页
Surface Technology
基金
“十三五”国家科技重大专项(2016ZX05058-002)
国家自然科学基金项目(51490652)~~
关键词
注水井
水质成分
结垢腐蚀
灰色关联度法
模糊物元法
water injection well
water quality components
scaling corrosion
grey correlation analysis method
fuzzy matter-element method
