[Ten years of development of chemical equipment] 714-2018 Qianjiang-Shaoguan Gas Pipeline Yangtze River 3120-meter Directional Crossing Project
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At 10 pm on December 15, 2017, Jianghan Petroleum Engineering Co., Ltd. used advanced "cross-penetrating" technology and after 48 days of hard work, successfully connected the guide holes of the Yangtze River Crossing Project of the Qianjiang-Shaoguan Gas Pipeline. The successful docking of the most difficult guide holes laid a solid foundation for the successful completion of the project.
The project has a total length of 3,120 meters and a pipeline diameter of 406.4 mm. The bottom geology of the Yangtze River is mainly hard weathered slate. It is an extremely difficult ultra-long-distance horizontal directional crossing project. It is also a control project of the Qianjiang-Shaoguan gas pipeline.
At 11:58 on April 30, 2018, after 58 hours of back-towing operations, the Yangtze River crossing project of the Qianjiang-Shaoguan gas pipeline constructed by the company was successfully towed back for the first time. The success of this back-towing laid a solid foundation for the Qianjiang-Shaoguan gas pipeline project to be completed on schedule.
The Yangtze River crossing project will pass through a weathered slate layer with a compressive strength of 33.5 MPa. The company will use a geomagnetic ground composite guidance system to adjust the guide hole curve in real time during the drilling process so that the guide curve accurately passes through the slate layer according to the design requirements. Due to the long length of the passing pipe section, which can easily cause the drill pipe to break, the company will use a dual-machine cross-penetrating process to construct the pilot hole. At the same time, in order to ensure the "perfect encounter" of the two cross-penetrating drilling rigs 30 meters underground, the company deployed a large artificial magnetic field in the entire crossing area, supplemented by magnetic carbon rods, flow magnetic sensors and gravity acceleration sensors to accurately position and control the direction of the drill pipe.
Since the Jianli section of the Yangtze River crosses the flood control embankment across the left bank, in order to avoid damage to the foundation of the embankment, the company will lower the booster casing 93 meters on the soil entry side of the left bank, and assist with large drill bits and large-displacement pilot hole technology to reduce the deformation loss when the drill pipe transmits force during hole expansion, and avoid fracture due to the excessive one-way crossing length of the drill pipe.； In the expansion stage, it is planned to use the relay forward expansion process of two drilling rigs to make the through holes meet the design requirements and ensure that the project is successfully completed before the 2018 flood season.