Non-excavation directional drilling of the main pipeline of Yili River

The successful non-excavation directional drilling crossing of the Ili River is one of the key projects on the Central Asia C Line. The project involves three crossings—main pipeline, mud pipe, and spare pipe—each requiring precise engineering solutions. This particular main pipeline crossing features a diameter of 1219 mm and spans 1019 meters. The stratum through which it passes consists mainly of sand and silt, making it difficult to maintain borehole stability and increasing the risk of collapse. To ensure the project's success, the company developed a scientifically sound and practical construction plan based on prior experience from similar large-diameter crossings in the eastern section of the West River and the second section of the West Second Line. On June 8, the project officially commenced. One of the major challenges was the sandy terrain, which made it hard for large vehicles to access the site, and the rig equipment could not be properly set up. Through the combined efforts of the company’s staff, these issues were resolved, allowing the control project of the Central Asia C Line to proceed smoothly. “Investing in production” is our responsibility, and we continue to carry forward the spirit of the pipeline iron men, working through harsh conditions—facing heat, wind, sand, and mosquitoes. In a short time, we repaired a construction access road, paved the site, and created favorable conditions for the successful execution of the crossing. The Kazakh market presented additional difficulties, with limited availability of equipment and materials. The company actively coordinated with its internal teams and overseas partners to expedite the clearance of supplies, ensuring that all necessary tools and materials arrived on time. Moreover, the construction site was remote and often exposed to wildlife threats, as well as risks posed by armed elements in the region. To address these dangers, the company developed a comprehensive HSE (Health, Safety, and Environment) program and an emergency response plan. Local security personnel were employed for 24-hour rotation, significantly enhancing the safety of the workers on site. During the actual construction phase, the company implemented a six-stage reaming and two-stage drilling approach, ensuring the accuracy and cleanliness of the borehole. To facilitate the smooth return of the pipeline, advanced PE pipe water injection and floating technology was used. Construction crews worked in 24-hour shifts, completing the heavy-duty roller transmission process within the safe timeframe. Additionally, five large-tonnage pipe-lifting machines were deployed, effectively addressing the challenge of dragging the geological back in the sand layer, ensuring continuous and stable pulling. At around 10 p.m. on July 4, the pipeline began to be pulled back. After nearly 15 hours of continuous underground operation, the long steel pipe successfully emerged from the ground. The project was completed in just 19 days, saving 27 days compared to the Ili River crossings of the Central Asia A and B lines. This main pipeline crossing marks the first directional drilling project completed on the Central Asia C Line. Its success has provided valuable experience for future crossings and has offered strong support for the accelerated development of the C Line pipeline across Central Asia. Non-excavation works | Non-excavation construction This article is reproduced from Bazhou Lutong Engineering Co., Ltd.: http:// Http://news.chinawj.com.cn Submission:

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