This is the 2957th article for you
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At 18:00 local time on February 16, the Bangladesh single point mooring project undertaken by the pipeline bureau ushered in a “good start”
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In the trenching construction of the first 18 inch submarine oil pipeline after crossing commercial and naval channels, the project team of the pipeline bureau achieved a complete success after 52 days of continuous efforts
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The maximum trenching depth reached 11.9 meters, meeting the requirements of the design documents and creating a new environment The deepest trenching in the industry is the world record, and the pipeline bureau’s technology in this field has reached the international leading level
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The project is an one important project for landing one belt, one road initiative in Bangladesh
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Construction began in January 28, 2019
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It involves the installation of single point mooring system, 6 directional drilling crossing by sea and sea, 146 km large-scale submarine pipeline laying, and 4 trench digging construction of over 11 meters deep sea oil pipeline
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It is very innovative and challenging
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After trenching, the submarine pipeline is first laid according to the predetermined route, and then the specially designed deep trench digger is used to crush and drain the sediment at the bottom of the pipeline by hydraulic jet and gas lift, so as to make the pipeline sink into the trench
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The normal depth of trench excavation after the submarine pipeline is generally 1.5m to 3m, reaching 5m, which is a highly difficult project in the industry
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The owner of the project requires that the submarine pipeline route cross the commercial and naval waterway of Bangladesh
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The project department has carried out more than 20 times of technical investigation and Discussion on the ships and equipment resources with five kinds of pre trenching technology principles, prepared 6 technical documents with 25 editions, submitted 45 editions of technical proposal, and finally determined to adopt the post trenching technology after many discussions with the owner and the supervisor
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In order to ensure the reliability of the technical scheme, in February 2020, during the peak period of submarine pipeline laying, the project team carried out the special demonstration test of deep trench excavation scheme on site, and organized technicians to carry out targeted technical transformation on the equipment for many times in combination with the test situation, which effectively improved the comprehensive performance of the equipment
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After the impact of novel coronavirus pneumonia and the closure of the rainy season, the trench began after the passage in December 26, 2020
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The geological conditions of the channel section are complex, and the alternation of silt layer, sand layer and clay layer leads to extremely unstable stratum
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With the gradual deepening of the trench excavation, a large area of continuous collapse occurred in the on-site trench, and the newly formed trench collapsed soon
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The high velocity and serious siltation of sediment in the bay of Bengal made the top of the pipe cover 2 to 4 meters of collapse soil layer, and the on-site construction progress was slow for a time
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The technical team comprehensively studied the preliminary survey data, and after many technical discussions, finally completed three targeted key technical improvement measures, including jet pump group process optimization, sludge discharge structure optimization, and underwater jet structure optimization
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The trenching work efficiency was significantly improved after on-site trenching, and finally the trenching of the first 18 inch subsea oil pipeline was successful
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Through the channel crossing construction, the project department comprehensively used a variety of trenching technology combinations, deep trenching data monitoring and comparison methods, and trenching model analysis theory, obtained a large number of field data, accumulated valuable practical experience, and laid the foundation for the smooth progress of trenching construction of the subsequent 1 18 inch and 2 36 inch submarine oil pipelines
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The year of the ox is even better than the year of the ox, the man of China Petroleum Pipeline who is struggling to run, come on! In the new year, we will continue to ride the wind and waves to achieve better results and speed up the construction of an international first-class energy storage and transportation company
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Like this article, please “like it” and “watch it” in the bottom right corner at the end of the article! Text picture Yang Jiang Fang Wu Chao Jiang Hua editor Nie Linrui Xu Chaoxia review Liu Liyan send you a little red flower: a circle of friends of wechat brush explosion pipe Taoist.
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