CO_2驱采油井中D级抽油杆的腐蚀特征  

Corrosion Behaviors of Grade D Sucker Rods in the Production Wells of CO_2 Flooding

作　　者：刘建新[1] 张瑞霞[1] 杨洁[1] 王卫明[1] 刘东清 

机构地区：[1]中石化胜利油田分公司采油工艺研究院,山东东营257000 [2]中石化胜利油田分公司海洋钻井公司,山东东营257000

出　　处：《石油天然气学报》2014年第10期199-201,12,共3页Journal of Oil and Gas Technology

基　　金：国家科技支撑项目(2012BAC24B03)

摘　　要：CO2驱开发过程中,抽油杆腐蚀是一个严重的问题。利用高温高压反应釜模拟CO2腐蚀环境,研究了不同井深和不同含水率条件下D级抽油杆的腐蚀行为。通过失重法测量平均腐蚀速率,用扫描电镜(SEM)和X射线衍射(XRD)研究腐蚀产物膜的形貌和结构。结果表明,井深超过1200m时,D级抽油杆腐蚀速率快速增加,到2000m时腐蚀速率出现最大值,之后腐蚀速率快速下降。在含水率30%以下,平均腐蚀速率低于0.01mm/a,处于耐蚀状态,含水率超过30%以后,腐蚀速率快速上升。腐蚀产物膜主要由Fe(Ca,Mn)CO3复盐构成。In the development of CO2 displacement,sucker rod corrosion was a serious problem.A high temperature and pressure autoclave was used to simulate the corrosive environment of CO2,the corrosion behaviors of Grade D sucker rods were studied for different well depths and different water contents,the average corrosive rate was measured by using weight-loss method.And the morphology and structure of the corrosive product's film were investigated by using SEM,XRD.Experimental results show that when the well depth exceeds 1200 m,its corrosive rate increases,and when the well depth exceeds 2000 m,the corrosion rate is up to a maximum value,and then it decreases quickly.The average corrosion rate is below 0.01mm/as water cut is below 30%.Vice versa,it increases rapidly.Meanwhile,the examination reveals that the corrosive product's film is mainly composed of the complex salts of Fe(Ca,Mn)CO3.

关 键 词：腐蚀 二氧化碳 含水率 抽油杆 

分 类 号：TE933.2[石油与天然气工程—石油机械设备]