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长宁输气管道工程是宁夏第一条长输天然气管道 ,东起陕甘宁气气田西至宁夏银川 ,管道全长 2 94km ,管径为 4 2 6mm× 6、7、8mm ,设计年输气量在 4 .5MPa输压时为 4× 10 8～ 6× 10 8m3 。黄河穿越工程位于黄河中上游宁夏回族自治区永宁县雷台二队仁村渡口附近 ,穿越段地层为河道沉积 ,砂层松散 ,含水量大时具有流砂特征 ,该工程是长宁管道工程的控制性工程 ,由中国石油廊坊管道设计院设计 ,宁夏伊斯兰地质勘查队进行地质勘查 ,中石油管道二公司、管道三公司施工 ,采用水平定向穿越技术 ,成功地完成了我国黄河中上游的首次穿越 ,其穿越长度、深度都为国内同类工程之最 ,为今后大型河流的管道水平定向穿越提供了宝贵的成功经验。

Horizontally Orienting Crossing Huanghe River Engineering of Changning Gas Pipeline

??Changning gas pipeline is the first long distance one in Ningxia.It starts from Shaan-Gan-Ning gas field in the east to Yinchuan of Ningxia in the west and has an overall length of 294 km,pipe diameters of Ø426 mm×6,7,7 mm and designed annual throughput rates of 400×106??600×106m3 at transfer pressure of 4.5 MPa.Crossing Huanghe River engineering is located at the vicinity of Ren Village,Leitai-2 Team,Yongn ing County,the Ningxia Hui Autonomous Region in the middle-upper reaches of the Huanghe River.The formation at the cross section is composed of channel depos its with unconsolidated sands.When water content is large,it is of the property of drift sands.Such engineering is the controlling one of Changning gas pipeline project.It is designed by the Langfang Pipeline Design Institute of PCL,surveyed by the Yisilan Geological Survey Team of Ningxia and constructed by the No.2 P ipeline Company and the No.3 Pipeline Company,PCL.The first corossing in the middle-upper reaches of the Huanghe River has been finished in China by use of horizonally orienting crossing technology and it is the longest and deepest crossing engineering in all of the same ones in China,thus providing valuable and succe ssful experience for pipeline's horizontally orienting crossing large-sized rivers.