回拖浮力平衡技术在水平定向钻工程中的应用  

Application of backtow flotage balance technology in horizontal directional drilling engineering

作　　者：张杰[1] 周朝霞[1] 叶文建[1] 邓文[1] 

机构地区：[1]四川石油天然气建设工程有限责任公司,四川成都610215

出　　处：《油气储运》2011年第8期619-620,633,共3页Oil & Gas Storage and Transportation

摘　　要：在大口径油气管道水平定向钻回拖过程中,随着管径的增大,泥浆浮力对回拖的影响明显增大。为了减小因泥浆浮力引起的管道与成型孔的摩擦力,降低回拖风险,通过对水平定向钻回拖过程中泥浆浮力作用的计算分析,采用注水PE管配重技术与泥浆密度调节相结合的方法,平衡管道回拖过程中的浮力。通过浮力平衡减少了管道在孔洞内与土体的摩擦面积,摩擦力降低率为80%,同时减少了由于管道浮力挤压而带来的孔壁垮塌风险。该技术在西气东输二线管道工程南水北调干渠水平定向钻穿越工程中得到成功应用,取得了良好的经济效益与社会效益。In the backtow process of horizontal directional drilling engineering for big-diameter oil/gas pipelines,mud flotage impacts on the backtow with the increases of pipe diameter.In order to reduce the friction between pipe and formed hole caused by mud flotage and reduce the risk of backtow process,the effect of mud flotage is calculated and analyzed.A counterweight technology with PE pipe water injection and mud density adjustment are used to balance the mud flotage in backtow process.With this technology,the friction area between pipe and the soil is reduced,and so the friction is lowered to 80%.Meanwhile,the risk of hole-wall collapse caused by the extrusion of pipe flotage is also decreased.The flotage balance technology is successfully adopted in horizontal directional drilling engineering of the main canal of South-North Water Transport Project in the Second West-to-East Gas Pipeline with remarkable economic and social benefits.

关 键 词：大口径管道 水平定向钻 PE管 注水 回拖 

分 类 号：TE89[石油与天然气工程—油气储运工程]