Integrity Challenges and Countermeasures of the Offshore CCUS Based on CO2-EOR
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摘要:
利用CO2提高海上油气田的采收率，既能提高油气资源利用率，又有利于区域CO2的捕捉封存，但海上油气井长期安全性是CCUS的关键因素，理论和技术亟待完善。在分析、总结国内外海上油气田CCUS井筒完整性关键技术的基础上，分析了制约浅海油田CCUS井筒完整性的技术挑战，研究了碳封存井固井、碳封存套管外腐蚀研究及预防、碳封存水岩反应井筒堵塞及井筒环境监测诊断等方面的技术，并从国家“双碳”目标、EOR/EGR技术需求及国内外新进技术经验等方面展望了我国浅海油气田CCUS的开发前景。虽然我国已初步具备开展海上CCUS的能力，仍需要在高韧性防CO2腐蚀水泥浆体系、低成本防腐选材、井筒高效除垢解堵工艺、CO2泄漏监测技术和地下圈闭三维应力场研究等方面加强技术攻关，以提高我国的CCUS应用水平。
Abstract:CO2 can be used to improve the recovery efficiency of offshore oil and gas fields. Not only does it increase the utilization rate of oil and gas resources but it also helps capture and store regional CO2. The long-term safety of offshore oil and gas wells is a key factor for carbon capture, utilization, and storage(CCUS), but corresponding theories and technologies need to be improved. By analyzing and summarizing key technologies of CCUS wellbore integrity in offshore oil and gas fields both in China and abroad, the technical challenges that restrict CCUS wellbore integrity in shallow offshore oil fields were analyzed. The studies covered cementing of carbon sequestration wells, research and prevention of carbon sequestration casing corrosion, carbon sequestration wellbore plugging caused by water-rock reaction, wellbore environment monitoring and diagnosis, and other technologies. In addition, the development prospect of CCUS in shallow offshore oil and gas fields was predicted in consideration of the national target of carbon peaking and carbon neutrality goals, enhanced oil recovery(EOR)/enhanced gas recovery(EGR) technology requirements, and experience of new domestic and foreign technologies. Although China is preliminarily capable of carrying out offshore CCUS, technology research should be strengthened in the aspects of high-strength CO2 corrosion-resistant cement slurry systems, low-cost anticorrosive material selections, high-efficient wellbore descaling and plugging processes, CO2 leakage monitoring technology, and three-dimensional stress field research of underground traps, so as to improve its CCUS application level.
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Keywords:
- offshore oil and gas field /
- CCUS /
- CO2 /
- EOR /
- wellbore integrity /
- technical challenges /
- development direction
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