西南石油大学学报(自然科学版) ›› 2007, Vol. 29 ›› Issue (2): 110-113.DOI: 10.3863/j.issn.1000-2634.2007.02.030

• 油气化学工程与化工 • 上一篇    下一篇

S135钢在含CO2聚合物钻井液中腐蚀研究

万里平1,2 孟英峰2 杨 龙1 王锦江3   

  1. (1.中国石油天然气集团公司管材研究所博士后科研工作站,陕西 西安 710065; 2.“油气藏地质及开发工程”国家重点实验室·西南石油大学,四川 成都 610500; 3.西安市天然气总公司用户工程部,西安 710068)
  • 收稿日期:2006-04-29 修回日期:1900-01-01 出版日期:2007-04-20 发布日期:2007-04-20
  • 通讯作者: 万里平

CORROSION OF S135 STEEL IN POLYMER DRILLING FLUIDS CONTAINING CO2

WAN Li-ping 1,2 MENG Ying-feng 2 YANG Long 1 et al.

  

  1. (Tubular Goods Research Center of CNPC, Xi′an Shanxi 710065,China)
  • Received:2006-04-29 Revised:1900-01-01 Online:2007-04-20 Published:2007-04-20
  • Contact: WAN Li-ping

摘要: 利用高温高压反应釜研究油田常用的四种S135钢在含CO2聚合物钻井液中腐蚀行为。结果表明,平均腐蚀速率随温度或CO2分压增大而先增大然后降低;随流速增大而升高。S135钢在动态液相中的平均腐蚀速率远大于动态气相,无论在液相还是气相S135钢平均腐蚀严重情况依次为S135(A)>S135(B)>S135(C)>S135(D)。该实验条件下(温度为100℃,CO2分压为3MPa,流速为2m/s,腐蚀时间为96h),S135钢气相局部腐蚀比较轻微,其点蚀系数介于1.12~1.49,液相局部腐蚀比较严重,其点蚀系数介于1.40~5.22。用聚合物钻井液钻遇高含CO2气层时,建议采用S135(D)钻杆,最好不用S135(A)或S135(B)钻杆。

关键词: S135钢, CO2腐蚀, 聚合物钻井液, 均匀腐蚀, 局部腐蚀, 钻杆

Abstract: Corrosion behavior of four kinds of S135 steel in polymer drilling fluids containing CO2 is investigated using high temperature high pressure autoclave. The results shows the average corrosion rate increases initially and then decreases as the rise of temperature or CO2 partial pressure; and increase as the flow velocity goes up. Average corrosion rate of S135 steel in dynamic liquid phase exceedes that in dynamic gas phase, and corrosion severity of S135 steel is listed as S135(A)>S135(B)>S135(C)>S135(D). In this corrosion environment(temperature100℃, CO2 partial pressure 3MPa, velocity of flow 2m/s, exposed time 96h), local corrosion of gas phase of S135 steel is mild and pitting corrosion coefficient is 1.12~1.49, while that of liquid phase of S135 steel more serious and its coefficient 1.40~5.22. S135(D)drill pipe is recommended to use in polymer drilling fluids containing high CO2 concentration, and S135(A)or S135(B)abandoned.

Key words: S135 steel, CO2 corrosion, polymer drilling fluids, general corrosion, local corrosion, drill pipe

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