西南石油大学学报(自然科学版) ›› 2020, Vol. 42 ›› Issue (2): 103-109.DOI: 10.11885/j.issn.1674-5086.2019.05.08.01

• 石油与天然气工程 • 上一篇    下一篇

用于CO2注气驱的油井缓蚀剂加注工艺优化研究

张德平1,2,3, 马锋2,3, 吴雨乐4, 董泽华4   

  1. 1. 东北石油大学石油工程学院, 黑龙江 大庆 163318;
    2. 国家能源CO2驱油与埋存技术研发(实验)中心, 吉林 松原 138000;
    3. 中国石油吉林油田公司, 吉林 松原 138000;
    4. 华中科技大学化学与化工学院, 湖北 武汉 430074
  • 收稿日期:2019-05-08 出版日期:2020-04-10 发布日期:2020-04-10
  • 通讯作者: 董泽华,E-mail:zhdong@hust.edu.cn
  • 作者简介:张德平,1980年生,男,汉族,四川营山人,高级工程师,硕士,主要从事油气田开发和CO2驱油与埋存工程技术研究、现场应用及技术管理工作。E-mail:Zhangdepjl@petrochina.com.cn;马锋,1982年生,男,汉族,陕西榆林人,高级工程师,主要从事三次采油防腐防垢技术方面的研究工作。E-mail:mafeng@petrochina.com.cn;吴雨乐,1994年生,男,汉族,安徽六安人,硕士研究生,主要从事集输管网垢下腐蚀、监测与抑制等方面的研究工作。E-mail:m201770325@hust.edu.cn;董泽华,1968年生,男,汉族,湖北仙桃人,教授,博士生导师,主要从事金属腐蚀与防护、腐蚀电化学、电化学科学仪器以及工程结构的腐蚀与安全监测等方面的研究工作。E-mail:zhdong@hust.edu.cn
  • 基金资助:
    国家科技重大专项(2016ZX05016-002)

Optimization of Injection Technique of Corrosion Inhibitor in CO2-flooding Oil Recovery

ZHANG Deping1,2,3, MA Feng2,3, WU Yule4, DONG Zehua4   

  1. 1. School of Petroleum Engineering, Northeast Petroleum University, Daqing, Heilongjiang 163318, China;
    2. National Energy and CO2 Flooding and Sequestration Technology Research(Experiment) Center, Songyuan, Jilin 138000, China;
    3. Jilin Oilfield Company, CNPC, Songyuan, Jilin 138000, China;
    4. School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China
  • Received:2019-05-08 Online:2020-04-10 Published:2020-04-10

摘要: 吉林某油田CO2注气驱油井受CO2分压、温度、采出液含水率以及细菌含量等诸多因素影响,造成井下管柱的严重腐蚀。为减缓腐蚀,当前主要采用井筒加注咪唑啉缓蚀剂来保护油井井筒和井下设备。通过研究CO2、SRB等多因素条件下的腐蚀规律和腐蚀主因素,从降低防腐蚀成本的角度考虑,考察了缓蚀剂类型、加药方式、加药浓度、加药周期对井下油套管腐蚀的抑制效率和长期有效性,并根据现场情况制定了合理的加药制度,提高了缓蚀剂的作用效率,延长其服役寿命,使区块整体腐蚀速率低于0.076 mm/a,实现了井下腐蚀的防护效率与成本的最优化。通过工艺优化,不仅延长井下设备的服役寿命,也降低了防腐蚀成本。

关键词: CO2驱油, 提高采收率, CO2腐蚀, 缓蚀剂, 加注工艺

Abstract: Severe downhole corrosion occurred during Jilin CO2 flooding in an oilfield in Jilin due to the high pressure of CO2, high concentration of saline water and sulfate reducing bacteria (SRB) in the produced fluid. Currently, addition of corrosion inhibitors is one of the common methods to protect the oil well and tubes. Through studies of corrosion mechanism and main factor analysis, the effects of inhibitor type, concentration, and injection technique on their filed inhibition efficiency and long-term durability were investigated, aiming at lowering the cost of corrosion management. Then a suitable injection regulation of inhibitor is proposed based on the filed situation in order to improve the long-term efficacy of inhibitor. Injection optimization tests indicate that the corrosion rate has been decreased to <0.076 mm/a. This optimized injection technique of inhibitor not only increases the service life of downhole device and tubes but also decrease the cost of corrosion management.

Key words: CO2 flooding, enhanced oil recovery, CO2 corrosion, corrosion inhibitor, injection technique

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