渤海油田水源井腐蚀结垢破坏及防治研究  

Research on the Causes and Prevention of Corrosion and ScalingDamage in Water Source Well of Bohai Oilfield

作　　者：周欢[1] 杜福云 刘正伟[1] 王圣虹[1] 庞明越 Zhou Huan;Du Fuyun;Liu Zhengwei;Wang Shenghong;Pang Mingyue(Production Optimization of China Oilfield Services Co.,Ltd.,Tianjin,300459,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300459

出　　处：《天然气与石油》2020年第6期97-103,共7页Natural Gas and Oil

基　　金：中海油田服务股份有限公司科技项目“渤海水源井出砂原因分析及改进措施研究”(YSB13YF008)。

摘　　要：随着渤海油田的开发,部分水源井出现了严重的腐蚀、结垢和冲蚀等破坏现象,导致了停泵检修作业频繁,水源供应不稳定的情况,严重影响到正常的注水开发。依据渤海油田水源井腐蚀结垢现状的主要特征,通过模拟井下条件,采用相同规格的P 110腐蚀挂片,进行了不同水样、不同温度、不同压力、矿化度及与同规格的S 314材质挂片捆绑的腐蚀模拟实验,并进行了垢样分析及结垢趋势预测。实验结果表明:水样、压力及矿化度对腐蚀速率影响不大,材料的不配伍会导致腐蚀速率相比单片实验腐蚀速率快1.5~4倍;分析了腐蚀结垢的主要原因及其影响因素得出,水源井筛管的破坏主要是由腐蚀、结垢、冲蚀的协同作用导致,优选了防砂方式及防砂筛管,能够有效防止筛管的腐蚀结垢及冲蚀破坏;提出了井下酸洗清垢及微管投放防腐防垢剂的防治措施,能够大大延长水源井生产周期,对渤海油田注水开发提高采收率具有重要意义。With the development of Bohai Oilfield,serious corrosion,scaling and erosion occurred in some of the water source wells,resulting in frequent pump shutdown and maintenance.The instability of water supply seriously affected the normal production enhancement via water injection.This paper presents corrosion experiments carried out for different water samples,at different temperatures,different pressures,salinities based on the main characteristics of the current corrosion and scaling status of the water source wells in the Bohai Oilfield,by simulating downhole conditions and using P110 corrosion coupons and S314 coupons with the same specification.Scale sample analysis and prediction of scaling trends are performed.The experimental results show that the water sample,pressure and salinity have little effect on the corrosion rate,and the incompatibility of the materials will cause the corrosion rate to be 1.5 to 4 times faster than the single-sheet experiment.The primary causes and influencing factors of corrosion and scaling are analyzed.The comprehensive analysis shows that the damage to the sand screen of the water source well is mainly caused by the synergy of corrosion,scaling and erosion.The sand control solution and sand screen selection are optimized;the preventive measures of underground pickling and descaling and injecting corrosion inhibitor and anti-fouling agent via micro-tube are proposed.The above proposals can greatly extend the production cycle of water source well and is significant in enhancing the recovery of shallow water development in Bohai Bay.

关 键 词：水源井 筛管腐蚀 结垢 冲蚀 防治措施 

分 类 号：TE985[石油与天然气工程—石油机械设备]