钻杆溶解氧腐蚀影响因素分析.pdf

验与研究
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钴杄溶解氧腐蚀影响因素分析
赵鹏',于杰2,郭金宝2
(1.宝山钢铁股份有限公司钢管条钢事业部,上海201900;2.宝钢研究院钢管条钢技术中心,上海201900)
摘要:溶解氧腐蚀是钻杆使用寿命下降的最重要的原因。通过试验研究和文献分析,论述了钻井施工过程
中服役环境、溶解氧浓度、泥浆pH值、井下温度、压力、钴井液、钴杆材质等诸多因素对钴杆溶解氧腐蚀的影
响。分析认为,氧浓度对钻杆腐蚀起主导作用,钴杆腐蚀速度随着氧浓度的增加而加快;防止钻杆氧腐蚀最简便
的措施是提高钻井液的pH值,最有效的办法是采用除氧剂对钻井液进行除氧。
关键词:石油钻井;钻杆;溶解氧腐蚀;影响因素
中图分类号:TE9211.2文献标识码:B文章编号:1001-2311(2010)02-0029-05
Analysis of Influencing Factors on Dissolved
Oxygen Corrosion of Drill Pipe
Zhao Peng, Yu Jie2, Guo Jinbao?
( 1. Tube, Pipe& Bar Business Unit, Baoshan Iron Steel Co, Ltd, Shanghai 201900, China; 2. Tube
Pipe &Bar Technology Center of Research Institute, Baoshan Iron Steel Co, Ltd, Shanghai 201900, China
Abstract: Dissolved oxygen corrosion plays the most critical role in service-life reducing of the drill pipe
Influencing factors responsible for the said corrosion are identified by means of relevant experimental studies and
literature analysis. The factors include the field service conditions of the drill pipe, concentration of dissolved
oxygen, PH value of drilling fluid, well temperature, well pressure, drilling fluid and drill pipe material, etc
Based on the analysis, it is concluded that oxygen concentration acts as the leading factor responsible for the
drill pipe corrosion, and such corrosion is speeding up along with the growth of the oxygen concentration. Accord
ingly, the co-authors put forward that for the purpose of preventing oxygen corrosion of the drill pipe, the simplest
way is to enhance the PH value of the drilling fluid, while the most effective way is to remove the oxygen from the
drilling fluid with the deoxidant
Key Words: Oil well drilling; Drill pipe; Dissolved oxygen corrosion; Influencing factors
0引言
其中因腐蚀而造成的损失占20%~50%,每年钻井
钻杆腐蚀是钻井工程中普遍存在的问题,在深进尺按1500万m计,腐蚀损失达0.9-2.5亿元人民
井超深井、深海井、高腐蚀性井中更显突出。在钻币。有关资料统计表明,在我国钻井行业每年发
井作业中,为适应各种钻井工艺的需要,使用了盐生的约500起钻井事故中,有60%是源于腐蚀,
水、钾基聚合物等钻井液体系,并含有多种添加处理这些事故所花费用与直接损失相当。
剂,在井下高温高压作用下具有强烈的腐蚀性。我
20世纪60~70年代,美国的 B W Bradley发
国石油钻井工程中,每钻进1m消耗4kg钻杆,表了一系列钻杆氧腐蚀的研究成果2。研究认为,
溶解氧腐蚀是钻杆使用寿命下降的最重要原因,都
赵鹏(1974-),男,高级工程师,中国石油学会石
是在中性和碱性环境中发生的,其腐蚀形式主要为
油管材专业委员会委员,主要从事油井管质量管理与
点蚀。
新产品开发工作。
20世纪80年代,前苏联的萨阿基扬丌C、叶
STEEL PIPE Apr 2010, Vol39, No. 2
钢質2010年4月第39卷第2期