
doi:10.3969/j.issn.16715152.2012.08.005
邝月芳·西江定向钻穿越管道外防离层保护的经验探讨
西江定向钻穿越管道外防腐层保护的经验探讨
口佛山市天然气高压管网有限公司(528000)邝月芳
摘要:随着城市燃气管网建设不断增加,水平定向钻穿越的应用越来越广泛。如能在地质条件复杂、穿
越难度大的工程中保护穿越管道的防扇层不受损伤,将会延长管道的实际使用寿命,从而减少通气运营的压力及运管费用的投入。在实际应用中,通过分析保护材料及保护方式,选择了性价比高的实施方案。本文将从使用环境,价格对比、施工工艺等方面对西江定向钻穿越管道的外防扇层保护应用经验进行探讨。
关键调:定向钻穿越地质条件管道防离层保护
ExploreonTheOuterCoatingProtectingExperienceofThe
DirectionalDrillingCrossingPipeinWestRiver
Foshan Natural Gas HighPressure Pipelines Co,Lid Kuang Yuefang
Abstract:With the increasing construction of city gas pipeline networks, the crossing of horizontal directional drlling is
used more and more widely. If the crossing pipe coating is protected from damage in the project with complex geological conditions and great crossing difficult, the life of pipeline will be prolonged, the operating pressure and operational costs will be cut down. In practical application, the best costeffective scheme was selected through the analysis of protective material and protection. This paper was written to explore the application experience of the outer coating protects of the directional drilling crossing pipe in West River project from the factors such as the environment, price comparison, construction technology.
Keywords:Crossing by Directional Drilling
Geological Conditions
西江为广东珠江的干流,是广东、广西水上交通运输的主航道。西江穿越是佛山市天然气利用工程二期西樵至西江管段的控制性工程,佛山市要实现向高明区输送管道天然气,燃气管道就不可避免的要穿过西江。
1
西江穿越的地质条件
西江穿越项目工程自2008年6月进行管线施工所
Pipeline
Coatings Protection
必须的常规性地质勘察以及2009年3月的补充勘察,揭示了西江穿越位置的河床宽约1100m,地质条件为穿越场地内第四系厚度在河两岸大于20m;河床中为15.50m~20m。第四系岩性主要为粉质粘土、淤泥质粉质粘土、砂土及圆砾和卵石。管段穿越段中部圆砾层、卵石层较长,灰岩中溶洞较发育,粉质粘土中局部发育土洞,穿越场地属抗震不利地段。该地层可采用定向钻方式穿越,但定向钻穿越圆砾和卵石有一
2012/08总第450期27