特种油气藏 ›› 2024, Vol. 32 ›› Issue (5): 167-174.DOI: 10.3969/j.issn.1006-6535.2025.05.020

• • 上一篇    

低温固化型甲基丙烯酸甲酯树脂井筒修复体系的优选与评价

毕卫宇1,2,3, 何治武1,3, 王智勇4, 周佩1,3, 王小勇1,3, 刘笑春1,3   

  1. 1.中国石油长庆油田分公司,陕西 西安 710021;
    2.咸阳师范学院化学与化工学院,陕西 咸阳 712000;
    3.低渗透油气田勘探开发国家工程实验室,陕西 西安 710021;
    4.中国石油长庆油田分公司采油一厂,陕西 延安 716000
  • 收稿日期:2024-10-24 修回日期:2025-08-01 出版日期:2025-09-25 发布日期:2025-10-30
  • 作者简介:毕卫宇(1975—),男,高级工程师,1997年毕业于抚顺石油学院化学工程专业,2009年毕业于西北大学化学工程专业,获博士学位,现从事提高采收率方面的研究工作。
  • 基金资助:
    中国石油科技专项“低渗/致密油藏大幅提高采收率关键技术研究”(2023ZZ17)

Optimization and evaluation of low-temperature curable methyl methacrylate resin wellbore repair system

BI Weiyu1,2,3, HE Zhiwu1,3, WANG Zhiyong4, ZHOU Pei1,3, WANG Xiaoyong1,3, LIU Xiaochun1,3   

  1. 1. PetroChina Changqing Oilfield Company, Xi′an, Shaanxi 710021, China;
    2. College of Chemistry and Chemical Engineering, Xianyang Normal University, Xianyang, Shaanxi 712000, China;
    3. National Engineering Laboratory for Exploration and Development of Low-Permeability Oil and Gas Fields, Xi′an, Shaanxi 710021, China;
    4. PetroChina Changqing Oilfield Company, No.1 Oil Production Company, Yan′an, Shaanxi 716000, China
  • Received:2024-10-24 Revised:2025-08-01 Online:2025-09-25 Published:2025-10-30

摘要: CO2驱油与封存过程中,受力学因素影响,可能导致井筒完整性缺失,出现气体窜逸和泄漏现象。针对该问题,以甲基丙烯酸甲酯为主剂,添加氧化还原引发剂和交联剂,研制了低温(30~45 ℃)固化型甲基丙烯酸甲酯(MMA)树脂井筒修复体系,并进行了性能评价。研究表明:在40 ℃条件下,该树脂修复体系的初凝时间为8.2 h,固化时间为10.4 h;修复体系具有良好的注入性能和黏结性能,表面张力为27.1 mN/m,与砂岩、N80钢片以及油井水泥的接触角均小于30°,与水泥柱-钢管界面的黏结强度较未修复前提高13.15倍。修复体系具有良好的CO2封窜性能和耐CO2老化性能,对水泥柱-钢管界面修复后,CO2突破压力为26.78 MPa;在CO2老化条件下,石英砂固结体的抗压强度及CO2渗透率在30 d内变化幅度小于5.0%;该树脂修复体系可以进入尺寸为20~100 m的微孔隙中,并在固化后对其进行紧密充填。该井筒修复体系对于低温储层开展CO2驱油与封存具有重要应用价值。

关键词: CO2驱油与封存, 井筒完整性, 井筒修复, 甲基丙烯酸甲酯, 树脂

Abstract: During CO2 flooding and storage, influenced by mechanical factors, wellbore integrity may be compromised, leading to gas channeling and leakage. In response to this problem, a low-temperature (30-45 ℃) curable methyl methacrylate (MMA) resin wellbore repair system was developed using methyl methacrylate as the main agent, with the addition of redox initiators and cross-linking agents. Performance evaluation of the system was subsequently conducted. The study shows that at 40 ℃, the initial setting time of this resin repair system is 8.2 hours, and the curing time is 10.4 hours; the repair system has good injection performance and adhesion performance, with a surface tension of 27.1 mN/m, and contact angles with sandstone, N80 steel sheet, and oil well cement are all less than 30°. The bonding strength at the cement-steel pipe interface is increased by 13.15 times compared to before repair. The repair system has good CO2 channeling sealing performance and CO2 aging resistance. After repairing the cement-steel pipe interface, the CO2 breakthrough pressure is 26.78 MPa; under CO2 aging conditions, the compressive strength and CO2 permeability of the quartz sand consolidated body change by less than 5.0% within 30 days; this resin repair system can enter micro-pores with sizes of 20-100 μm and tightly fill them after curing. This wellbore repair system has important application value for CO2 flooding and storage in low-temperature reservoirs.

Key words: CO2 flooding and storage, wellbore integrity, wellbore repair, methyl methacrylate, resin

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