大管径天然气管道预装冻芯局部冷冻封堵  

Pre-installation of cold core for local frozen plugging of large diameter gas pipeline

作　　者：梁政[1] 兰洪强[1] 邓雄[1] 刘继银 李莲明 

机构地区：[1]西南石油大学石油天然气装备教育部重点实验室,四川成都610500 [2]中国石油西气东输管道分公司苏浙沪管理处,江苏南京210002 [3]中国石油集团长庆油田分公司采气二厂,陕西西安710016

出　　处：《油气储运》2011年第10期778-780,717,共3页Oil & Gas Storage and Transportation

基　　金：中国石油天然气集团公司长庆油田分公司;石油天然气装备教育部重点实验室资助项目"大管径天然气管道冷冻封堵技术研究";2010STS06

摘　　要：针对现阶段大管径天然气管道焊接动火置换作业存在的问题,提出了哑铃状冻芯局部冷冻封堵技术,向预冻成型的哑铃状冻芯与管道内壁之间的环形空间注入固水乳化剂,利用固水乳化剂在低温下与管道内壁的冻粘效应实现油气隔离。试验研究表明:该技术可以通过外加冷源将固水乳化剂冻透,使之与预置冻芯和管壁成为一个整体,从而有效隔离管内油气,并可承受不超过2.2MPa的压力,可操作性强,安全性高。The local frozen plugging technology with dumbbell-shaped cold core is presented to solve the existing problems in current welding-replacement operation of large diameter gas pipeline.The solid-water emulsifier is injected into the annular space between the frozen dumbbell-shape cold cores and internal wall of pipe,the oil and gas isolation can be realized when the solidwater emulsifier is stuck onto the internal wall of pipe at low temperature.Experiment results indicate that the technology can make the solid-water emulsif ier,preset cold core and internal wall of pipe become a whole by making the solid-water emulsif ier frozen by using additional cold source,and then the oil and gas within pipeline will be isolated at<2.2 MPa.This method has higher safety with sound maneuverability.

关 键 词：大管径 天然气管道 冻芯 局部封堵 安全动火 隔离油气 

分 类 号：TE88[石油与天然气工程—油气储运工程]