含杂质超临界CO_(2)管道止裂分析及控制方案  

Crack Propagation Analysis and Arresting Control Scheme of Pipeline for Transporting Supercritical CO_(2)with Impurities

作　　者：陈兵[1] 毕鉴 齐文娇 王香增[2] 徐梦林 CHEN Bing;BI Jian;QI Wenjiao;WANG Xiangzeng;XU Menglin(College of Mechanical Engineering,Xi’an Shiyou University,Xi’an,Shaanxi 710065,China;Shaanxi Yanchang Petroleum(Group)Co.,Ltd.,Xi’an,Shaanxi 710000,China)

机构地区：[1]西安石油大学机械工程学院,陕西西安710065 [2]陕西延长石油(集团)有限责任公司,陕西西安710000

出　　处：《西安石油大学学报（自然科学版）》2024年第1期106-113,共8页Journal of Xi’an Shiyou University（Natural Science Edition）

基　　金：国家重大工程子项“延长石油碳捕集和驱油封存一体化示范项目”(ycsy2015ky-B-02);陕西省科技重点研发计划项目“基于CCUS的含杂质CO_(2)管道输送安全关键技术研究”(2022SF-233);西安石油大学研究生创新立项项目“含杂质超临界CO_(2)管道止裂分析及控制方案”(YCS22213118)。

摘　　要：管道输送作为CCUS技术的关键环节,在超临界高压环境下输送CO_(2)时,由于含杂质CO_(2)特殊的相特性,一旦发生泄漏,压力会维持较高值且温度急剧下降,输送管道易发生裂纹扩展,造成断裂事故。基于延长油田一期36×10^(4)t/a超临界CO_(2)管输预研方案,根据减压波速度计算模型和管道裂纹延性扩展止裂判据,采用修正后的Battelle双曲线法对管道进行止裂分析,对无法满足止裂要求的设计方案进行增加壁厚试算。结果表明:材质为X80、尺寸为Φ140 mm×6.0 mm的L12管线韧性值满足工况下裂纹控制的要求;而同样材质等级、壁厚组合为Φ168 mm×6.0 mm的L11管线所提供的止裂压力低于平台压力,无法保证管线发生裂纹延性扩展时能够自行止裂。对于L11管线,通过将管道壁厚增加至7 mm,其他设计参数不变,可以实现裂纹自行止裂。该研究可为实际工况下Battelle双曲线法在超临界CO_(2)管道断裂控制的应用提供理论基础与实际范例。Pipeline transportation is a key link in CCUS technology.When transporting CO_(2) in supercritical and high-pressure environments,due to the special phase characteristics of CO_(2) containing impurities,once a leak occurs,the pressure will maintain a high value and the temperature will sharply decrease.The transportation pipeline is prone to crack propagation,causing fracture accidents.In the preliminary research for the supercritical CO_(2) pipeline transportation plan of 36×10^(4) t/a in the first phase of Yanchang Oilfield,based on the calculation model of pressure reduction wave velocity and the criteria for pipeline crack propagation and crack prevention,the crack prevention of the pipeline is analyzed by using the modified Battelle hyperbolic method.For design schemes that cannot meet the crack prevention requirements,wall thickness of pipeline is increased by trial calculation.The results show that the toughness value of L12 pipeline with material X80 and sizeΦ140 mm×6.0 mm meets the requirements of cracking control under working conditions;while the crack arresting pressure provided by L11 pipelines with the same material grade and sizeΦ168 mm×6.0 mm is lower than the platform pressure,which cannot guarantee the automatic cracking arresting of pipeline when the pipeline experiences ductile crack propagation.The L11 pipeline can achieve automatic cracking arresting by increasing wall thickness to 7 mm and keeping other design parameters unchanged.This study can provide theoretical basis and practical examples for the application of Battelle hyperbolic method in fracture control of supercritical CO_(2) pipelines under actual working conditions.

关 键 词：CCUS 超临界CO_(2) Battelle双曲线法 止裂 控制 

分 类 号：TE973[石油与天然气工程—石油机械设备]