【Ten Years of Rapid Development in Chemical Engineering Equipment】746-2018: Directional Drilling of the Largest 1422 mm Gas Pipeline on the China-Russia Eastern Route across the Nenma River
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https://bbs.hcbbs.com/data/attachment/myqr/801/3587801.png https://bbs.hcbbs.com/source/plugin/nimba_threadqr/logo.jpg You can scan these codes to access this topic and see the significant development of chemical processing equipment over the past decade; praise China’s prosperity and strength. More people’s participation makes it more lively, and HaiChuan becomes even better with you here. This is just a starting point – we welcome everyone to engage more in discussions on the forum; replies will be rewarded. Discussion is encouraged! ------------------------------------------------- On April 4, 2018, good news came regarding the China-Russia East Gas Pipeline Project: China National Petroleum Pipeline Engineering Co., Ltd. successfully completed the directional drilling crossing of the Nemoer River for this project, which is considered the largest key project of its kind in China – the China-Russia East Gas Pipeline Project (Heihe-Changling section). This project filled the gap in horizontal directional drilling technology for pipelines of the same diameter in China, and set a new record for the directional drilling of natural gas pipelines with the largest diameter in the country. The starting point of the China-Russia Eastern Gas Pipeline Project is located on the China-Russia border in Heihe City, Heilongjiang Province. It passes through 9 provinces and municipalities, including Heilongjiang, Jilin, Inner Mongolia, Liaoning, Hebei, Tianjin, Shandong, Jiangsu, and Shanghai, with its end point being Shanghai. The total length of this pipeline is 3,371 kilometers; it is currently the largest-diameter and highest-pressure long-distance gas transmission pipeline in China. The Nemoer River crossing project, as one of the most important control projects in the northern section of the China-Russia East Route natural gas pipeline, is the essential route for delivering gas inland after it enters the country via this route. The Nemoer River is a seasonal river; the optimal period for construction is from mid-October to mid-April of the following year. The lowest winter temperatures can reach minus 40°C, posing significant challenges to project construction. By 2017, the largest diameter of pipeline for which directional drilling penetration had been successfully applied in China’s oil and gas long-distance pipeline sector was 1219 mm. The challenge facing the constructors is to thread a pipe with a diameter of 1422 mm, a length of 765 meters, and a weight of over 1000 tons through a \"hole\" with a diameter of 1778 mm in mud, while ensuring that the pipe’s anti-corrosion coating remains intact and minimizing the impact of the construction on the local ecosystem.
【Ten Years of Rapid Development in Chemical Engineering Equipment】742-2019: CNPC Pipeline Bureau in Bangladesh sets new records for land and sea directional drilling of pipelines in China https://bbs.hcbbs.com/thread-3587770-1-1.html (Source: Haichuan Network – Chemical Industry News)
【Ten Years of Rapid Development in Chemical Engineering Equipment】742-2019: CNPC Pipeline Bureau in Bangladesh sets new records for land and sea directional drilling of pipelines in China https://bbs.hcbbs.com/thread-3587770-1-1.html (Source: Haichuan Network – Chemical Industry News)
At the beginning of the second phase of construction in the test section in June 2017, the China-Russia East Route Project Department held several expert seminars on tunneling solutions. Taking into account the construction characteristics of the China-Russia East Route, which involve the use of ultra-large-diameter D1422 mm pipes, high-grade X80 steel pipes, and a high pressure level of 12 MPa, as well as the recommendations resulting from assessments regarding flood control and environmental impacts, as well as the meteorological, hydrological, and geological conditions at the tunneling site, the team conducted repeated analyses and comparisons of the efficiency and economic viability of options such as open-cut excavation, shield tunneling, and directional drilling. By adhering to the principle of giving priority to environmental protection as stipulated in the new environmental protection laws, they opted for the \"open-cut excavation + directional drilling\" approach as the final solution.
The horizontal length across the Nemoer River is 752 meters, while the total length of the pipelines installed through directional drilling in the main river channel is 755 meters. A D144 fiber optic cable duct is also passed parallel to the main pipeline, at a distance of 20 meters from it. The construction process involves a six-stage reaming technique. The areas where excavation takes place on both banks of the river consist of gravel, which makes it difficult to form proper drill holes; as a result, 43,400 cubic meters of soil need to be removed and replaced, making the construction task exceptionally challenging.
During the long and cold winter construction period, the project team innovatively adopted new types of drilling tools and advanced drilling techniques to speed up the hole-drawing process； By constructing insulation sheds covering over 8,000 square meters, it is possible to ensure that construction workers stay warm, as well as to provide winter insulation for drilling rigs, associated equipment, and the mud system ； Solve a series of challenges such as frozen soil excavation, water injection for pressure testing, and control of the pipeline’s entry angle into the tunnel during retraction ； The two-shift construction mode reduces equipment failure rates and improves construction efficiency.
The Nemoer River crossing is carried out through a combination of directional drilling and large-scale excavation works. Pulling the pipeline back is a key control step in directional drilling, and successful pulling back signifies the completion of the entire directional drilling operation. Through extensive and meticulous scientific calculations, repeated tests and verifications were carried out on drill string setup, drilling rig equipment, mud pumps, and mud preparation ； The method of guiding the pipeline into the tunnel is optimized: instead of the traditional approach using a single drilling rig for traction, a vertical retraction method at the tunnel entrance is employed to guide it in accurately. Innovative working methods and new techniques have proven highly effective, breaking through one obstacle after another.