On January 29, 2015, after 24 hours of towing operations, the Gas Pipeline Bureau Crossing Company successfully completed the directional drilling crossing of the Yangtze River for the Rudong-Haimen-Chongming Island gas pipeline (pipe diameter 610mm, length 3500m), the fourth time Created a new record for the world pipeline crossing (the previous three lengths were 2700m and 3302m).
During the construction, the pilot hole operation was completed with a high standard using butt-crossing technology; at the same time, the proprietary mud-injection technology was used, combined with the information of drilling thrust and drill pipe torque feedback from electronic instruments, to timely adjust the mud displacement and optimize The mud performance overcomes the construction problems such as large abrasion resistance, difficulty in carrying debris, and prone to lock and breakage of the drill pipe when traversing the ultra-long distance silt formation, and successfully completed the three-level reaming operation.
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