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China's Largest Caliber Directional Drill Crossing Project
- Apr 16, 2018 -

China Petroleum News (Reporter Huang Jun, correspondent Ding Jiayi) At 11 o'clock on the April 4th, after 5 months of the Sino-Russian Eastern Line crossing the Nemur River, the country’s first large-diameter pipeline was finished, under complex geological conditions. The construction of the directional drilling project with the highest difficulty and highest risk is the new record.

At present, the maximum diameter of a successful domestic directional oil-gas transmission pipeline is 1219 mm. The construction of the Nagar River is a controlled project of the East China-Russia route. Directional drilling is adopted to increase the excavation method. The diameter of the tunnel is 1,422 mm and the actual length is 765 meters.

About 55 kilometers downstream of the Negri River passing through the pipeline is the Nagar River Nature Reserve in Heilongjiang Province. To this end, the Sino-Russian Eastern Pipeline Project Department will take the protection of the ecological environment as a top priority. At the beginning of the construction of the second phase of the test section in June 2017, an expert seminar was held on several occasions to cross the scheme and the geological conditions of the site were used to repeatedly study the crossing plan. From the special program formulation to the emergency plan exercise, from the construction of resources to the implementation of winter insulation measures, the project management team fully used the advantages of integrated, integrate resources, implement separately.

The employees participated in overcoming the low temperature of minus 40 degrees and other difficulties. Through the new type of reaming drilling tools and reasonable drilling tool combinations, six-level reaming technology and all-day environmental impact risk point monitoring technology were adopted. After the backfill of the trenches, no water loss or soil erosion occurred. Minimized construction operations and protected the local environment.