ZHAOHuai-zhu,JINXin,WENGao-feng,et al.Research on Key Technology of Horizontal Directional Drilling across the Main Canal of South-to-North Water Diversion Project[J].China Water & Wastewater,2022,38(18):94-100.
Research on Key Technology of Horizontal Directional Drilling across the Main Canal of South-to-North Water Diversion Project
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第38卷
Number:
第18期
Page:
94-100
Column:
Date of publication:
2022-09-17
- Keywords:
- main canal of South-to-North Water Diversion Project; micro-expansive silty clay; horizontal directional drilling; mud spillover
- Abstract:
- The investment and construction of Nanyang supporting Neixiang water supply project in the receiving area of South-to-North Water Diversion Project in Henan Province can fundamentally solve the problem of water supply in Neixiang County, improve the water ecological environment in the city and its surrounding areas, and alleviate the groundwater pressure. The water supply pipeline of the second bid section of the project crosses the main canal of the South-to-North Water Diversion Project and is laid by horizontal directional drilling method, mainly through the stratum of calcareous nodule micro-expansive silty clay. The pipeline is plastic-coated composite steel pipe with a diameter of 1 040 mm and a length of 723.901 m. The buried depth of the horizontal section at the bottom of the canal is 15.731 m. In order to ensure the special safety of the main canal of the South-to-North Water Diversion Project and strictly prevent mud spillover at the bottom of the canal, a 303 m long test hole was drilled in the opposite direction of the original crossing track before the project was formally drilled. At the same time, combined with mud formulation optimization, casing isolation of shallow soft formation, pressure relief drilling technology, bottom hole drilling tool construction control and other technologies, a series of problems such as cuttings blocking, drilling direction compression and sticking are solved, which ensures the smooth implementation of the project.
Last Update:
2022-09-17