孔隙率对埋地超临界CO_(2)管道泄漏扩散的影响  

Influence of the Porosity on the Leakage and Diffusion of the Buried Supercritical CO_(2) Pipeline

作　　者：陈兵[1] 赵琼 郭焕焕 CHEN Bing;ZHAO Qiong;GUO Huan-huan(College of Mechanical Engineering, Xi'an Shiyou University, Xi'an 710065, China)

机构地区：[1]西安石油大学机械工程学院,西安710065

出　　处：《科学技术与工程》2022年第19期8313-8319,共7页Science Technology and Engineering

基　　金：中国石油天然气股份有限公司重大科技攻关项目(2019E-25);国家重大工程延长石油碳捕集和驱油封存一体化示范项目子项(ycsy2015ky-B-02);陕西省科技计划项目(2022SF-233);西安石油大学研究生创新与实践能力培养计划(YCS20213181)。

摘　　要：长输管道中的超临界CO_(2)流体一旦发生泄漏并扩散到周围环境中,将会造成极大的经济损失并对生命体构成潜在的生理危害。针对不同土壤孔隙率下埋地超临界CO_(2)管道发生小孔泄漏初期的扩散规律展开研究。根据中国土壤特点选用0.35、0.45、0.55、0.65四种孔隙率,结合中国某油田超临界CO_(2)埋地管道的输送工况参数,依据相关的基础理论建立三维土壤-管道模型,使用FLUENT专业模拟软件,模拟埋地CO_(2)管道发生泄漏初期CO_(2)在不同孔隙率的土壤中扩散情况,通过分析计算得到其以均匀扩散为主的扩散规律。以所选最大孔隙率为例,以5%为CO_(2)危险浓度,确定以泄漏口为中心的2 m范围内的地表为危险区域,相关结论为施工人员提供技术参考。Once the supercritical fluid of CO_(2) transported in the pipeline leaks and diffuses into the surrounding environment,it will pose potential physiological hazards to humans and animals and cause huge economic losses.Based on the influence of soil porosity on the initial diffusion law of buried CO_(2) pipeline,small pore leakage was studied.The porosity rate of 0.35,0.45,0.55,0.65 was choosen according to the soil characteristics of China and combine the parameters of the transportation condition of the supercritical CO_(2) buried pipeline in a domestic oil field.Based on the relevant theories,the three-dimensional soil-pipeline model was established and the professional simulation software FLUENT was used to simulate the diffusion of buried CO_(2) pipeline in soil with different porosity at the initial stage of leakage.It is obtained that the main form of diffusion is uniform diffusion.Taking the selected maximum porosity as an example,with 5%as CO_(2) hazardous concentration,the surface within 2 m centered on the leakage port is determined as the hazardous area,and the relevant conclusions provide technical reference for the construction personnel.

关 键 词：超临界CO_(2) 埋地管道 孔隙率 泄漏 扩散 

分 类 号：TE832[石油与天然气工程—油气储运工程]